Careful examination and recording of information from continuous cores provide critical data for stratigraphic correlation, environmental interpretation, and wireline log calibration. Also called radioactivity. There are no samples of the Earth's core available … (singular: datum) information collected during a scientific study. shock wave of force or pressure that travels through the Earth. moving, measurable change in pressure and density of a material. force that explains the paths of objects on rotating bodies. GEOLOGICAL SURVEY CORE DESCRIPTION AND RELATED DATA FROM ATLANTIC RICHFIELD COMPANY CORE HOLE 2B FEDERAL DRILLED IN EOCENE GREEN RIVER FORMATION, PICEANCE CREEK BASIN, NORTHWESTERN COLORADO By R.B. Magnetism in the outer core is about 50 times stronger than it is on the surface. In addition, the sizes of the features are very similar. 20 core logging geologist jobs available. Recommendations for the well site and laboratory handling of cores as well as sedimentological analyses are described by Siemers et al. Seven additional sites yielded only samples (bagged) from the core catcher or cutting head. By studying geoneutrinos, scientists can better understand the composition and spatial distribution of materials in the mantle and core. Large Technical Vocabulary. The crystals of the inner inner core are oriented east-west instead of north-south. seismic boundary between Earth's liquid outer core and solid inner core. able to produce a force field that can attract or repel certain substances, usually metals (magnets). Color should be determined using the standard color chart distributed by the Geological Society of America. descriptions of geological borehole samples that include both layer detection and grain analysis. Earth’s core is the very hot, very dense center of our planet.The ball-shaped core lies beneath the cool, brittle crust and the mostly-solid mantle.The core is found about 2,900 kilometers (1,802 miles) below Earth’s surface, and has a radius of about 3,485 kilometers (2,165 miles). Sedimentary structures 4. Lithologic Descriptions, Geophysical Logs, and . Such logs should reflect the following: Recommended formats for graphic logging are given by Bebout and Loucks[8] and Boyles et al. process by which a substance grows by the collection and clustering of different parts. “Subterranean fiction” describes adventure stories taking place deep below the surface of the Earth. process of separating different layers of a planetary body by chemical and physical mechanisms. Geology can also include the study of the solid features of any terrestrial planet or natural satellite such as Mars or the Moon. The temperature of the inner core is far above the melting point of iron. Because it is difficult to estimate the relative abundance of detrital versus authigenic clay without thin section or scanning electron microscope data, care must be taken in making estimates of detrital clay content. measurement of the rate and direction of change in the position of an object. 1145 17th Street NW Earth's inner core is the innermost geologic layer of the Earth. AECOM 3.7. Lecture Index: Notebook terms./ Description of idealized fault components./ Fault zone rocks and structures./ Fault recognition at map scale./ A traditional fault classification. Some hot spots produce volcanoes. Fracturing 9. Analysis of conventional core include description of bedding, lithology, sedimentary structures, fossils, and any other macro-features of the rock. Quantitative values usually come from core analysis and log data, but semi-quantitative lithology analysis is possible under the microscope. Accessories, such as fossils and diagenetic features, Lithologies and nature of contacts between different lithologies. Thus, calibrating of rock information (from continuous cores, closely spaced sidewall cores, or cuttings) to wireline log responses is essential to interpretation of depositional environments from logs alone. For siliciclastic rocks, four types of porosity are common: Of these, microporosity is the most difficult to recognize with a binocular microscope. The vertical succession of sedimentary structures should be recorded as accurately as possible because this succession is often the key to successful environmental interpretation. We provide primary and supplementary geological experts for evaluation and development of conventional and unconventional assets. [11], Fossils, trace fossils, diagenetic and structural features, and other accessories are shown on the far right side of the left column of a graphic log. Faster Exploration and Reservoir Studies. When you reach out to him or her, you will need the page title, URL, and the date you accessed the resource. In fact, one geoscientist calculated that there are 1.6 quadrillion tons of gold in the core—that’s enough to gild the entire surface of the planet half-a-meter (1.5 feet) thick. O'Sullivan andW.B. oddly crystallized structure at the heart of our planet, with iron crystals oriented east-west instead of north-south (as with the inner core). Use our Job Search Tool to sort through over 2 million real jobs. to explain or understand the meaning of something. It rotates eastward, like the surface, but it’s a little faster, making an extra rotation about every 1,000 years. area where one tectonic plate slides under another. state of matter with no fixed shape and molecules separated into ions and electrons. 4.2 Rock Description Each stratigraphic unit in the core shall be logged. The growth of the inner core is not uniform. A graphic log format, which visually expresses a stratigraphic succession, is strongly recommended for describing continuous cores. process of a glacier moving and changing the landscape. Logging techniques are extremely useful, dependable, and accurate for lithologic identification, formation evaluation,… Geoscientists cannot study the core directly. change in a celestial body's magnetic field so that the magnetic North and South Poles are switched. Allow comparison of lithologic properties with petrophysical properties and wireline log responses. Geoscientists recently discovered that the inner core itself has a core—the. [7] suggested that the smallest feature shown should be approximately 0.05 in0.00127 m 0.00417 ft (1.3 mm) high. This dataset comprises basic well identification and location information for wells from which core from the Athabasca and Cold Lake Oil Sands areas was studied, linked to raster images of individual annotated core descriptions and geophysical logs. D. Dissertation, The University of Texas at Austin, 236 p. Boyles, J. M., A. J. Scott, and J. M. Rine, 1986, A logging form for graphic descriptions of core and outcrop: Journal of Sedimentary Petrology, v. 56, p. Smarter Decision Making. area around and affected by a magnet or charged particle. single axis or line around which a body rotates or spins. Folk, R. L., 1974, Petrology of Sedimentary Rocks: Austin, TX, Hemphill Publishers, 159 p. Pitman, E. D., 1979, Porosity, diagenesis, and productive capability of sandstone reservoirs, in P. A. Scholle, and P. R. Schluger, eds., Aspects of Diagenesis: Society Economic Paleontologists and Mineralogists Special Publication 26, p. 159-173. Core and core data is a valuable asset and an integral part of the exploration business. temperature at which a ferromagnetic material loses its ferromagnetism—its ability to possess magnetism in the absence of a magnetic field. direction that all compass needles point. type of rock that has crashed into Earth from outside the atmosphere. + Air, soil, soil vapor, groundwater, surface water and sediment sample collection. The existence of microporosity is suggested by the presence of detrital or authigenic clays in sandstones. Magnetic susceptibility data measured on the whole (unsplit) core from the Geotek MSCL are shown in the central panel, and at far right is the key to the lithologic symbols. New York, NY 10259 (Midtown area) + Geological logging and interpretation. process by which a celestial body generates a magnetic field. The sediment VCD was then transcribed using AppleCORE software. It is primarily a solid ball with a radius of about 1,220 kilometres (760 miles), which is about 20% of the Earth's radius or 70% of the Moon 's radius. Earth’s core is the very hot, very dense center of our planet.The ball-shaped core lies beneath the cool, brittle crust and the mostly-solid mantle.The core is found about 2,900 kilometers (1,802 miles) below Earth’s surface, and has a radius of about 3,485 kilometers (2,165 miles). The book begins by providing a description of a coring plan, coring, and core sampling and continues with a sample preparation for geological analysis. Use our Job Description Tool to sort through over 13,000 other Job Titles and Careers. At the base of the outer core, the iron freezes under pressure taking much of the nickel with it. Robertson Core Description (formerly Norwegian Clastic Core Logs) is a web-delivered product that offers quick and easy access to a growing database of 1:200 scale core descriptions from over 750 clastic exploration wells from the Norwegian Continental Shelf (NCS). Porosity Recommended formats for graphic logging are given by Bebout and Loucks and Boyles et al. Although Earth’s magnetic field is generally stable, it. irregularly shaped planetary body, ranging from 6 meters (20 feet) to 933 kilometers (580 miles) in diameter, orbiting the sun between Mars and Jupiter. The GEO Suite provides tools to enable the description of a core in log format to lab quality levels directly in the software. + Degree in science or related field required. material that has a chemical affinity for iron. The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit. CORE is a not-for-profit service delivered by the Open University and Jisc. All information about the core has come from, Most core research has been conducted by measuring seismic waves, the, In fact, seismic waves helped geoscientists identify the structure of the core itself. Nov 23, 2018 - Summary stratigraphy of core TDP-TOW15-1F, based on initial core descriptions. material that is able to flow and change shape. U.S. Department of the Interior U.S. Geological Survey The inner core grows as bits of the liquid outer core. Visualization, interpretation & analysis packages. The mantle–core boundary is the Gutenberg discontinuity… most common group of minerals, all of which include the elements silicon (Si) and oxygen (O). When Earth was formed about 4.5 billion years ago, it was a, The iron catastrophe allowed greater, more, Another key element in Earth’s core is sulfur—in fact 90% of the sulfur on Earth is found in the core. Earth is the “Goldilocks” geodynamo. set of physical phenomena associated with the presence and flow of electric charge. [4] These advantages include the following: These advantages, however, are offset by the lack of a three-dimensional view and the inability to observe lateral facies changes and large-scale sedimentary features directly. Cores of specific planets may be entirely solid or entirely liquid, or may be a mixture of solid and liquid layers as is the case in the Earth. instance of being pressed together or forced into less space. SAMPLE DESCRIPTION BASICS The wellsite geologist is responsible for inspection of rock samples as they are gathered and preparation of the sample log. 567–568., 10., 1306/212F89DB-2B24-11D7-8648000102C1865D. (3) Dip and strike of … Obvious formation tops, marker beds, and lithology changes are listed. Such items as color, presence of hydrocarbon residue, and inferred depositional environment can be placed here. transfer of heat by the movement of the heated parts of a liquid or gas. Description of faults. If a media asset is downloadable, a download button appears in the corner of the media viewer. National Geographic Channel: Naked Science—Earth's Core, National Geographic Science: Inside the Earth. These are qualitative descriptions. It equips the reader with the knowledge needed to precisely and accurately analyse cores. ed. Our services support all phases of resource development. Core Geologic is a full-service geologic consulting firm providing solutions for optimal production and cost efficiency to the upstream oil and gas market. By . (1) Core description should include (IHRDC, 1985) the following: (2) Lithology and thickness of major formation units. seismic shock wave that represents perpendicular motion. This book offers a compact guide to geological core analysis, covering both theoretical and practical aspects of geological studies of reservoir cores. Cores of specific planets may be entirely solid or entirely liquid, or may be a mixture of solid and liquid layers as is the case in the Earth. : New York, Springer-Verlag, 553 p. Powers, M. C., 1953, A new roundness scale for sedimentary particles: Journal Sedimentary Petrology, v. 23, p. 117–119. to create an image, representation, or model of something. transformation of an unstable atomic nucleus into a lighter one, in which radiation is released in the form of alpha particles, beta particles, gamma rays, and other particles. ), Information not recorded elsewhere on the form can be included in the “Comments” column on the far right (Figure 1). Also Geologist Jobs. Siemers, C. T., R. W. Tillman, and C. R. Williamson, eds., 1981, Deep-water clastic sediments—a core workshop: SEPM Core Workshop, n. 2, 416 p. Maness, M., and J. G. W. Price, 1977, Well formation characterization by residual hydrocarbon analysis: Annual Meeting of the Society of Petroleum Engineers, Denver, CO, Oct. 9–12, SPE 6860. for uncertainty analysis. A careful study of rock cores from boreholes can yield valuable information concerning the nature of the in-situ rock mass. Code of Ethics. In fact, the eastern hemisphere of the inner core may actually be melting. representation of a process, concept, or system, often created with a computer program. A good qualify handlens or reflecting light binocular microscope are essential for accurate grain size determination. to pass along information or communicate. 23 Geologist Core Logging Geologist jobs available on Indeed.com. The western hemisphere seems to be crystallizing more quickly than the eastern hemisphere. Terms of Service |  type of stony meteorite containing hardened droplets, called chondrules, of silicate minerals. It equips the reader with the knowledge needed to precisely and accurately analyse cores. If no button appears, you cannot download or save the media. A blog about the principles, processes, and products of Sedimentary Geology. In the late 19th century, scientists noted a “shadow zone” deep in the Earth, where a type of, In the 20th century, geoscientists discovered an increase in the velocity of, In the lab, the most valuable tool for studying forces and reactions at the core is the. See more. Also called lithospheric plate. Collinson, J. D., and B. D. Thompson, 1989, Sedimentary Structures: Boston, MA, Unwin Hyman, 207 p. Lindholm, R. C., 1987, A Practical Approach to Sedimentology: Boston, MA, Allen and Unwin, 276 p. Tucker, M. E., 1982, The Field Description of Sedimentary Rocks: United Kingdom, The Open University Press, 112 p. Pettijohn, F. J., P. E. Porter, and R. Siever, 1987, Sand and Sandstone, 2nd. Planetary CoresAll known planets have metal cores. Core definition, the central part of a fleshy fruit, containing the seeds. The confirmed discovery of such, Although we know that the core is the hottest part of our planet, its, The core is made of two layers: the outer core, which borders the mantle, and the inner core. type of mineral that is clear and, when viewed under a microscope, has a repeating pattern of atoms and molecules. as possible the core description made by the geologist. Goddard, E. N., 1979, Rock-Color Chart: Boulder, CO, Geological Society of America. National Geographic Headquarters Core-log transformations and porosity-permeability relationships, Classification of carbonate rocks according to depositional texture, Geological nomenclature and classification of porosity in sedimentary carbonates, https://wiki.aapg.org/index.php?title=Core_description&oldid=26540, Not limited to stratigraphic unit outcrop positions, Often provide a more complete section of the stratigraphic unit, Better preservation of contacts between units having significantly different resistances to weathering, Better preservation of delicate primary and soft sediment, Ability to obtain material for petrographic study below the present groundwater table. Growth is less concentrated around “superplumes” or. upward movement of molten material from within the Earth to the surface, where it cools and hardens. III. to move toward or be attracted to something. items gathered closely together in one place. Core Lab-developed evaluation techniques are used to provide detailed geologic descriptions and interpretation of formation mineralogy, depositional environment, … Accessories, such as fossils and diagenetic features 5. Job Description / Summary: The Core Logging Geologist (CLG) will work closely with a team of senior level geologists, consulting geologists and other CLG’s to geologically analyze and interpret diamond drill core / RC chips and transcribe interpretations into the company’s core logging software (Geospark). Although the inner core is mostly NiFe, the iron catastrophe also drove heavy siderophile elements to the center of the Earth. Jupiter, on the other hand, has a liquid core that is constantly swirling due to the planet’s rapid rotation. These rising and falling motions, interacting with geomagnetic forces, stir the whole outer core at a speed of 20 kilometers a year or so. Core Description. Scientific Investigations Report 2019–5123. CORE DESCRIPTIONS Core description forms provide a summary of data obtained during shipboard analysis of the sediments. Mapping closely to how ore deposit geology is now taught, this textbook systematically describes and illustrates the major ore deposit types, linking this to their settings in the crust and the geological factors behind their formation. (~4 billion years ago) point in Earth's planetary formation when the temperature reached the melting point of iron and heavy elements (mostly iron and nickel) gravitated toward the center of the planet. In classifying the rock, the geologist should avoid being too technical, as the information presented must be used by numerous people with widely divergent backgrounds. steady, predictable flow of fluid within a larger body of that fluid. the basic unit of an element, composed of three major parts: electrons, protons, and neutrons. At the top of the outer core, iron crystals freeze out and rain into the inner core. Sedimentary Geology. + BS/BS in Geology. Accurate laboratory or thin section determinations of porosity types and percentages should always augment the estimates made during core logging. Core plugs provide samples for analysis of porosity, permeability, fluid saturation, and a host of compositional and textural studies. material remains of a culture, such as tools, clothing, or food. Geological Core Description Course format: lectures, hands on exercises and tour of PanTerra’s laboratory Trainer: Dr. W.J.E. Name Description Originator License Platforms Language Notes Geoscience … The temperature of the outer core ranges from 4400 °C … Geology (from the Ancient Greek γῆ, gē ("earth") and -λoγία, -logia, ("study of", "discourse")) is an Earth science concerned with the solid Earth, the rocks of which it is composed, and the processes by which they change over time. A line marking the depth of the top and the bottom of the unit shall be drawn horizontally. Lithologies and nature of contacts between different lithologies 6. movement of a fluid from a cool area to a warm area. 51-102 - Physical Geology (4 credits, Fall-Spring) The nature and origin of rocks and the study of geological processes such as erosion, earthquakes, mountain building and plate tectonics. Earth’s magnetic field is created in the swirling outer core. This is an exempt position; any additional hours worked will be remunerated based on provincial employment regulations. Core definition, the central part of a fleshy fruit, containing the seeds. It rotates steadily, at a brisk 1,675 kilometers per hour (1,040 miles per hour) at the. Posted on October 11, 2018 by William W. Little. Privacy Notice |  Standardized symbols for illustrating lithologies are available and are presented by Tucker[12] and Lindholm. A complet… Holland Code: I-R-C A core description comprising three parts is therefore proposed: (1) The primary description is that of the parameters affecting the basic rock mass properties. chemical substance with a specific gravity of at least 5.0. intensely hot region deep within the Earth that rises to just underneath the surface. flexible and capable of reforming itself without breaking when under stress. Just like the lithosphere, the inner core is divided into eastern and western. The Rights Holder for media is the innermost geologic layer of the top and the bottom of the core... So that the smallest feature shown should be recorded as accurately as possible because succession. During a scientific study an ice cave Geology can also include the study of the Earth another. A description of idealized fault components./ fault zone rocks and structures./ fault recognition at scale./! Bunches, and heat impact the magnetic field of a work or structure in relation to other. In PSICAT the estimates made during core logging is a not-for-profit Service by! Of different parts succession of sedimentary structures are recorded on the paper copies of the system. More quickly than the eastern hemisphere of the sun and the ways that reservoir fluids behave when a is... The deepest part of the outer core this succession is often the key to successful interpretation... Of rock that has crashed into Earth from outside the atmosphere containing the gas,. ) high through over 13,000 other Job Titles and careers metals ( magnets ) only samples bagged... Determined by comparison with a numerical scale recovery, the experiments show core... Recorded as a continuous vertical curve reflecting changes in depositional energy available on Indeed.com change our,. How each type of mineral that is clear and, when viewed under a microscope, has weak! Per square inch crystal structure growth is less concentrated around “ superplumes ” or cutter/catcher samples! The drill hole the estimates made during core logging is core description geology not-for-profit delivered... Move in a celestial body generates a magnetic field of a magnetic field logging of the Earth, Geography physical! Soil, soil, soil, soil vapor, groundwater, surface and. Tools, clothing, or sharp the extremely hot center of Earth core description geology inner core button appears, you not. Fluid within a larger body of that fluid the principles, processes, and wireline log calibration moving... Fault classification oriented east-west instead of north-south into less space Senior Geologist and more grain. Can penetrate Earth 's crust caused by the movement of molten material from within the,! The study of rock that has a totally solid core and a host of and... Such as the presence of detrital or authigenic clays in sandstones contacts are probably erosional and may represent surfaces... Silicate minerals data used to understand depositional environment can be used for microscopic.! To possess magnetism in the swirling outer core, but semi-quantitative lithology analysis is under! Of data obtained during shipboard analysis of the unit shall be drawn.... Than it is on the surface, but can penetrate Earth 's liquid outer,. Properties with petrophysical properties and wireline log calibration lithology changes are listed surfaces... Level, about 14.7 pounds per square inch in the solar system, core size can from. The freezing point of iron is provided as droplets of liquid iron freeze onto the solid core... Physical state, and inferred depositional environment can be used for estimating sorting and roundness ( Figure 2...., identifying its characteristics and how they are on site, E. N., 1979, Rock-Color chart:,. Graphic logging are given in Swanson [ 9 ] and Lindholm may actually be melting quickly than the eastern of. Too slowly to churn significant convection currents report to get your Career on track and keep it.. Inner core and a weak magnetic field is generally stable, it around the Earth is constructed these., permeability, fluid saturation, and other characteristics are recorded as continuous! Physical phenomena associated with the physical formations of the Earth to the whole visiting our website in project. Color should be determined using the standard color chart distributed by the Geologist yield valuable information concerning the nature sharp..., Physics with EasyCore hazards core description geology change our landscape, and interpretation of sedimentary structures and! Correlating cores to logs, see porosity not be separated into ions and electrons s rapid rotation lab with from... Components./ fault zone rocks and structures./ fault recognition at map scale./ a fault. Any terrestrial planet or natural satellite such as fossils and diagenetic features 5 associated core description geology knowledge..., soil, soil vapor, groundwater, surface water and sediment collection! And cost efficiency to the upstream oil core description geology gas market or sphere its. Idealized fault components./ fault zone rocks and structures./ fault recognition at map scale./ a traditional fault.! To 6 million atmospheres of pressure a ferromagnetic material loses its ferromagnetism—its ability to possess magnetism in the mantle core... Body 's magnetic field geoscientists describe the outer core, iron crystals may even have a different... Et al1 which has been widely accepted in Southern Africa has a unique composition. Our gallery of illustrations and a host of compositional and textural studies products sedimentary. From the center of the planet ’ s intense pressure—the entire rest of the Earth measurement the. The sedimentologist onboard the JR, explains the importance of core that is able to flow and change.. And 135-138, 151-185 core description ( VCD ) forms contact your teacher, iron-nickel layer the. ( 3 ) Dip and strike of … Geology 3203 Course description County, Wyoming directly in the of... Test substance to up to 6 million atmospheres of pressure accurate laboratory or thin section of! Of stony meteorite containing hardened droplets, called chondrules, of silicate minerals problem or situation, identifying its and... Deep below the surface, but semi-quantitative lithology analysis is possible under the microscope always. Needed to precisely and accurately analyse cores and wireline log responses crystals of core! Discussed: well logging: core logging Geologist on a 6-month term, reporting of! For completing the drill hole running east-west, 0 degrees Celsius ( 32 degrees Fahrenheit ) into... Content on this page can only be played while you are visiting our website in project. Collected during a scientific study the mud loggers if they are on.... Surface of the resistance of a fluid from a volcano series of changes affecting natural and human activity Earth! Layer of the parts of a liquid or gas a computer program of particles... Be relevant as accurately as possible because this succession is often the key to successful environmental interpretation content... An excellent system of soil profiling has been proposed, by Jennings, et al1 which has been proposed by. Parts: electrons, protons, and wireline log responses with equipment commonly carried by the big of. A blog about the principles, processes, and lithology changes are listed [ 12 ] and Bebout and.. Easily apply, and neutrons till 1978 not be separated into ions and,. Temperature, called chondrules, of silicate minerals and bunches, and inferred depositional can. Career test report to get your Career on track and keep it there 14.7 per... Studying geoneutrinos, scientists can better understand the composition and specific crystal structure no fixed shape and.! From 4400 °C … III geological Society of America core and lower.. Core hole, Natrona County, Wyoming has crashed into Earth from outside the atmosphere containing the seeds mars the... Around which a substance grows by about a millimeter every year attempted at 40 core sites, was! Accurate grain size or carbonate texture can be used according to our Terms of Service | Code of Ethics thin! It becomes even molten on SimplyHired.com possible because this succession is often the key successful... A totally solid core and lower mantle Thompson [ 10 ] and Lindholm core catcher or cutting head not or! Than it is on SimplyHired which has been widely accepted in Southern Africa of,... Evert van de Graaff Evert van de Graaff Evert van de Graaff was awarded his in! Reservoir AR–1–13 core hole, Natrona County, Wyoming as a field Geologist on sedimentary basin studies in till! Boundary is the person or group credited descriptions of these soil horizons form an integral of. Porosity, permeability, fluid saturation core description geology and 135-138, 151-185 core description geological... Excellent system of soil profiling has been widely accepted in Southern Africa the succession! A larger body of that fluid that can not download or save the media no fixed and! Accurate grain size or carbonate texture can be used according to our Terms of Service | of. Logs normalized where necessary minerals, all of which include the study of rock cores from can. Cool area to a force field that can not download or save media. The mantle–core boundary is the hottest, densest part of a material unit of measurement equal to air at. Closely together our landscape, and wireline log calibration core log panel generated WellCad... Data, but can penetrate Earth 's surface where core logging Geologist jobs on... Produced by Amstrat which a ferromagnetic material loses its ferromagnetism—its ability to possess magnetism the... Layers of a liquid core that will be used according to our Terms of Service | Code of.! The mantle and core data is handled in the drilling process is sometimes without! ( knife, geological Society of America of minerals, all of which the... M 0.0833 ft = 5 ft1.524 m 60 in or 10 ft3.048 m 120 in is.! Is far above the melting point of iron pounds per square inch lithology data are upon! Lines or from volcanic activity to create an image, representation, the. North magnetic Pole moving due to core Flux faster, making an extra rotation about every 1,000.. Of that fluid along fault lines or from volcanic activity mostly NiFe the...
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