Black shales. New and existing Mo isotope data from early Cambri...

2.2 Description of Shale Material. The cores were

Shale is a rock that has been formed from the compression of mud over time. Some black shale contains organic compounds that can be converted to oil or natural gas. Other colors of shale are crushed and mixed with water to create clay.A suite of black shales and a few pyrite samples were collected for this study from the Bijaigarh shale of the Kaimur Group (Fig. 3).In order to minimize the influence of surficial weathering, the samples were collected from the underground PPCL pyrite mine at Amjhore, in the Rohtas area, about 30 km south of Dehri-on-Sone (Fig. 1).The Amjhore pyrites associated with black shales exhibit ...Nov 1, 2001 · Both preservation and productivity models have been proposed for transgressive black shales. Thus, plankton bloom-stimulated anoxia is commonly invoked (Leckie et al., 1990, Middelburg et al., 1991, Coveney et al., 1991), whereas others have suggested they may record the expansion of ‘normal’ basinal conditions during base-level rise, with the result that sub-pycnocline deposition is ... These black shales are interbedded with phosphorites and limestones in sequences 3 to 35 m thick; deposition occurred mainly on a carbonate ramp during intermittent upwelling under varying redox conditions, from suboxic to anoxic to sulfidic. Deposition of the black shales at ~335 Ma was broadly contemporaneous with sulfide mineralization in ...Ordovician-Silurian organic-rich shale successions of the Upper Yangtze Platform consist of the Upper Ordovician Wufeng Formation, Guanyinqiao Formation, and Lower Silurian Longmaxi Formation (Su et al., 2009).The Wufeng Formation with a thickness of tens of meters is characterized by black chert, and carbonaceous shale and mudrock containing radiolaria and graptolites (Chen et al., 2000, 2006).Early Cambrian black shales are widely distributed on the southeastern margin of the Yangtze platform, South China (Guo et al., 2007; Wen et al., 2015; Fig. 1).They formed under a variety of physicochemical conditions due to variable contributions of continental and biotic components with increasing water and burial depth, and they have been shown to contain relatively high V concentrations (e ...Molybdenum, Bi, and Te are commonly enriched along with Au, As, and Sb in organic matter and in diagenetic pyrite in black shales (e.g., Large et al. 2007Large et al. , 2011 Gregory et al. 2015 ...This study examines a lower Cambrian pyrite-bearing black shale-graywacke succession in the Czech Republic interpreted as infill of a deep-marine, extensional trench-slope basin on top of an accretionary wedge that developed during subduction of an oceanic plate beneath the northern margin of Gondwana.The new U-Pb detrital zircon geochronology of the graywacke constrains the maximum age of ...Fragments below exposure of fissile Marcellus black shale at Marcellus, N.Y. The Marcellus consists predominantly of black shale and a few limestone beds and concentrations of iron pyrite (Fe S 2) and siderite (FeCO 3). Like most shales, it tends to split easily along the bedding plane, a property known as fissility.Devonian black shales deposited on the North American craton contain abundant Tasmanites cysts. Although these are typically flattened because of compaction, a small proportion are filled with diagenetic silica. The latter are spherical to ellipsoidal (0.1--0.5 mm), and filled with chalcedony, microquartz and megaquartz, and single quartz ...Black shales of the ca. 1.73 Ga Wollogorang Formation previously yielded an erroneously young Re-Os date of 1359 ± 150 Ma, likely due to post-depositional hydrothermal alteration at ca. 1640 Ma. Higher δ 238 U is observed in samples closer to the base of the black shale unit where the greatest extent of open-system Re-Os behavior was observed.2001, Marine and Petroleum Geology. The ®rst important contention of this paper is that black shales can be deposited by any one or by a combination of the processes that typically control ®ne-grained sedimentation in deep water. These are brie¯y described below. See Full PDF.The paleoenvironment during the Early Cambrian is closely related to the accumulation mechanism of organic matter (OM) from the Lower Cambrian black shales. However, paleoenvironment remains a controversial issue. Here, we reported a lot of detailed data of sedimentary stratigraphy and geochemistry of the Lower Cambrian Yuertusi Formation in the Aksu area, Tarim Basin. The Yuertusi Formation ...Re–Os depositional age for black shales from the Kaimur Group, Upper Vindhyan, India. GR Tripathy, SK Singh. Chemical Geology 413, 63-72, 2015. 60: 2015: Chemical erosion rates of river basins of the Ganga system in the Himalaya: Reanalysis based on inversion of dissolved major ions, Sr, and 87 Sr/ 86 Sr.A recent drilling operation in the Triassic Yanchang Formation (Tongchuan District of the Ordos Basin, north-central China) reached a black shale bed with an average in-situ gas content of 1.11 g/ml. Subsequent total organic carbon (TOC) content measurements and rock-eval analysis showed that the black shale section was generally classified as excellent source rock, with TOC contents commonly ...Jul 21, 2015 · a) A black shale formed during OAE 1a (120 million years ago) cropping out at Permanente quarry, California, U.S.A. b) Livello Bonarelli black shale formed during OAE 2 (94 million years ago ... limestones are enclosed within the black shales and nodular to bioturbated limestones occur between the marls [1,11,33]. Black Shale . The black shales, also known as dark, laminated shales [33], form thin (a few cm) to thick (up to 2 m) beds. They are blue-grey and fissile in weathered surfaces, but dark-grey to black and laminatedBlack shales and massive sulfides represent reduced lithofacies that require isolation from oxic environments to be preserved. This, together with the sedimentary affinity of both lithofacies, can explain their common concurrence in the geologic record. The present study is based on the comparison of Rammelsberg in Germany, Tharsis in Spain, and Draa Sfar in Morocco, three massive sulfide ...Black shale. This page is currently not sponsored. Click here to sponsor this page. A shale with at least 1% carbonaceous material indicating a reducing environment. A dark, thinly laminated carbonaceous shale, exceptionally rich in organic matter (5% or more carbon content) and sulfide (esp. iron sulfide, usually pyrite ), and often containing ...The shale specimens were retrieved from an outcrop of Marcellus formation located in the western New York. Marcellus shale is an organic rich shale formation, extends in the subsurface from New York state in the north to the northeastern Kentucky and Tennessee in the south, eastern Ohio to extreme western Virginia.23 Marcellus shale primarily contains carbonaceous silty black shale with ...Black shale, channel sample 0.5 ft thick. Black shale, channel sample 0.4 ft thick. Do. Black shale, channel sample 1.4 ft thick. Phosphatic nodules, weathered; from whole exposure. Channel sample, 1 ft of black brittle shale; location in formation unknown; near base of about 15 ft expo­ sure. Channel sample, 2 in. of black, very hard shale ...The focus of this study is on the relatively thin Upper Ordovician organic-rich black shale units that were earliest documented from Southampton Island during 1960s-1980s, but which are typically poorly outcropping and were of uncertain age and correlation (Nelson, 1963, Nelson, 1964; Sanford et al., 1968; Sanford, 1970; Nelson and Johnson, 1976; Macauley, 1986; McCracken and Nowlan, 1989).Black shale and coal Clarke values are the average trace element contents in the World black shales and coals. These calculations are made in Russian geochemistry but up to now are poorly known in ...It was shown that the contents of Ni, Mo, and Co in the siliceous clay black shale rocks of the normal sections of the Bazhenov Formation are several times higher than the global mean contents of these elements in black shales. These rocks have the highest contents of pyrite and organic carbon and show evidence for strongly reducing formation conditions at the slowest background rate of ...In the overlying late Hirnantian and early Rhuddanian, the distribution of black shales reaches its greatest extent in the studied interval. Localities showing evidence of anoxia are globally spread over all paleolatitudes and water depths for which data are available, indicating a Rhuddanian ocean anoxic event comparable to examples from the ...Black shales are organic-rich sediments that commonly formed coevally in space and time through Earth history and have been associated with perturbations in the carbon cycle, climate change and ...Because black shales of this formation represent an important source rock for hydrocarbons, considerable research has been conducted on various aspects of these strata. The Lower and Upper Members of the Bakken are black shales whereas the Middle Member is composed of sandstone, siltstone, and dolostone (Fig. 2; Smith et al., 1995).Summary: New Albany Shale Group [name used incorrectly, should be New Albany Group] is a continuous body of black, gray, and greenish-gray shales found throughout Illinois basin portions of IL, IN, and western KY. Used as a group only in IL. Ranges in age from Middle Devonian to Lower Mississippian (Kinderhookian); most of the body is Late ...Most recently, Kennedy et al. (2002), based on a study of two black shale locations of Cretaceous age, suggested that organic carbon (C org) absorption onto clay mineral surfaces is a major controlling factor in its burial and preservation. Peucker-Ehrenbrink and Hannigan (2000) and Jaffe et al. (2002) investigated mobility of platinum …Black shales are widespread at the Precambrian/Cambrian transition and document a global ocean anoxic event, which is part of major environmental and biological changes, such as plate tectonic reconfiguration, mass extinction, and accelerated diversification of metazoans (Kimura and Watanabe, 2001, Steiner et al., 2001).State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development, Beijing, 102206, China SINOPEC Key Laboratory of Geology and Resources in Deep Stratum, Beijing, 102206, China School of Vehicle and Energy, Yanshan University, Qinhuangdao, 066000, ChinaBlack shales can record Earth's oxygenation process, provide petroleum and metallic mineral resources, and reveal information about the driver, direction, and magnitude of climate change. Future research on black shales should be expanded to encompass a more extensive and more multi-dimensional perspective.Organic-rich black shales were widely accumulated on the early Cambrian Yangtze Platform (i.e., the Niutitang Formation and its equivalents), providing us a unique window to assess the influence ...Highly metalliferous black shales (HMBS) or hyper-enriched black shales (HEBS) contain >1500 ppm of combined Mo+Ni+Zn+Se+V (Johnson et al. 2017; Gadd et al. 2022). In addition to the metals ...Shale gas is a type of natural gas generated from organic-rich black shale [10, 11]. When permeability and porosity were both low, shale may have been an effective natural gas reservoir [ 12 ]. Shale gas can be stored in several ways, including free gas in natural fissures and intergranular porosity, gas dissolved onto kerogen and clay surfaces ...The black shale in Niutitang Formation of the Lower Cambrian widely develops in Guizhou Province, and its distribution is controlled by the type of the lithofacies palaeogeography. The black shale ...Aug 14, 2023 · Locations of samples of black shales with critical mineral geochemistry (Granitto and others, 2017) were used as an evidential layer to calculate prospectivity models for sediment-hosted Pb-Zn mineralization as described in Lawley and others (2022). The Xiaotan section, situated on the southwestern Yangtze Platform, South China, contains an unusually expanded sedimentary record, spanning the upper Neoproterozoic to the Cambrian and representing more than 40 My of marine sedimentation.Three distinct black shale units of the Shiyantou and Yuanshan formations were analysed for redox-sensitive trace elements and iron speciation, in order to ...Black shales are mixtures of terrigenous, biogenous, and hydrogenous sediment in which organic matter constitutes at least 0.5% of the material. Shales are the end product of the processes that ...The calibration of the Tl isotope redox tracer in modern euxinic (anoxic and containing dissolved sulfide in the water column, such as the Black Sea and Cariaco Basin) and anoxic but non-euxinic (sulfidic conditions limited to sediment pore fluids, such as the Santa Barbara Basin) environments suggests that black shales deposited under these conditions have the potential to faithfully record ...We target the Alum Shale in Sweden, which represents a relatively continuous sedimentary succession of black shales deposited across this time interval. These organic-rich shales allow us to apply proxies that more directly characterize both local and global redox conditions in the later Cambrian ocean: iron speciation, trace metal abundances ...Black shale Clarke values are the average trace element contents in the World black shales. It is well known that black shales (carbonaceous, mainly marine sedimentary rocks) often are metalliferous and/or bituminous: enriched in U, V, Mo, Re, many other trace elements, and "shale oil". That is why the Clarke values for black shale are very ...Black shales are currently of interest in geochemical and geological investigations because they may host gold and platinum deposits or petroleum and natural gas fields. To ensure the accuracy of analysis of such samples, standard reference materials SCHS-1 and SLg-1 are now being certified at the Institute of Geochemistry SB RAS, …The hydrocarbon potential of the black shale units has been evaluated by Rock-Eval pyrolysis. Total organic carbon content of many of the shales exceeds 1%. The meanT max for the black shales translate to a vitrinite reflectance range of 2.05-2.40% Rm based on standard conversion techniques. These shales have reached the catagenetic stage near ...The amount of organic carbon in the Devonian shale sequence rantes from less than 0.5% to nearly 20%. The average organic carbon content for the black shales having a color value of N 1-N 3 is about 4% by weight. Those shales lighter in color than N 3 have an average of about 0.8% organic carbon.Thin, black Pennsylvanian marine shales are almost invariably enriched in organic matter and heavy metals, such as zinc and uranium. Based on three factors (depositional environment, organic matter type, and inorganic geochemistry), Pennsylvanian marine black shales form two distinct, but intergradational varieties (fig. 1): 1) Mecca-type (molybdenum-rich) shales that formed near the ancient ...Black shales of the Late Devonian to Early Mississippian Bakken Formation are characterized by high concentrations of organic carbon and the hyper-enrichment (> 500 to 1000 s of mg/kg) of V and Zn8-5 DEVONIAN BLACK SHALES OF WES TERN NEW YORK DOUGLAS G. PATCHEN KATHARINE LEE AVARY West Virginia Geo logi ca l Survey Morgantown, WV 26507 INTRODUCTION The road log that fo llows is essentially a condensed version of the fina l day of a 5-day trip through the Middle and Upper Devonian clastics of central and western New York (Patchen and Dugolinsky, 1979).Gray-black shale associations in Sh2c. Gray shales are distributed across the entire study area during slice Sh2c, cross-cutting mid-ramp to basinal facies belts (Fig. 8). Analysis of a dark gray shale from this time slice yields 1.05% Fe 2 O 3 and 3.78% FeO. This is nearly the same iron concentration as green shales of slice Te4.T he black shales of the Xiaowa Formation, Guanling area, Guizhou Province, south-west China, are a unique Late Triassic (Carnian) Lagerstätte (Wang X. et al., 2000b, 2002a, b, 2003a, b).Nowhere else are so many marine reptile skeletons and pelagic crinoids known in such perfect preservation from this time. Comparable preservation and abundance is known only from the Anisian/Ladinian (Middle ...Oct 16, 2020 ... Genesis of hyper-enriched black shale Ni-Mo-Zn-Pt-Pd-Re mineralization in the northern Canadian Cordillera Speaker: Mike Gadd Geological ...The organic carbon-poor black shales are characterized by large amounts of dinocysts. Higher runoff coeval with black shale deposition is suggested by the common occurrence of freshwater algae such as Pediastrum, Scenedescus and various Tasmanitaceae, temporarily forming abundance peaks up to 90% of the total fraction [Fiet, 1998].Shale is a rock that has been formed from the compression of mud over time. Some black shale contains organic compounds that can be converted to oil or natural gas. Other colors of shale are crushed and mixed with water to create clay.In order to reconcile these conflicting results, four black shale samples, each between 10 and 20 cm long, were collected over a depth range of 98.3–141.25 m in ABDP core #3 (Hardey Formation) and five samples of black shale, each between 10 and 15 cm long, were collected over a range of depth of 85.2–267.81 m in ABDP core #6 (Table 1). 2.2Black shales and massive sulfides represent reduced lithofacies that require isolation from oxic environments to be preserved. This, together with the sedimentary affinity of both lithofacies, can explain their common concurrence in the geologic record. The present study is based on the comparison of Rammelsberg in Germany, Tharsis in Spain, and Draa Sfar in Morocco, three massive sulfide ...Core of the Month: May 2022. Oil from Shale: The KGS-IMMR Mississippian-Devonian Black Shales Cores. Dave Harris, Energy and Minerals Section.Black shales are dark, as a result of being especially rich in unoxidized carbon. Common in some Paleozoic and Mesozoic strata, black shales were deposited in anoxic, reducing environments, such as in stagnant water columns. Some black shales contain abundant heavy metals such as molybdenum, uranium, vanadium, and zinc. Shale gas is a type of natural gas generated from organic-rich black shale [10, 11]. When permeability and porosity were both low, shale may have been an effective natural gas reservoir [ 12 ]. Shale gas can be stored in several ways, including free gas in natural fissures and intergranular porosity, gas dissolved onto kerogen and clay surfaces ...Few black shales contain concentrations of precious metals higher than average continental crust (i.e. ∼5 ppb Au). Yet Au and Pt alloys have been reported from the Kupferschiefer in Poland. Moreover, thin sulfide beds in certain Chinese and Canadian shales contain several hundred ppb Au, Pd and Pt and average ∼4% Mo and ∼2.5% Ni in an ...Black shales of Devonian age in the Appalachian basin are a unique rock sequence. The high content of organic matter, which imparts the characteristic lithology, has for years attracted considerable interest in the shales as a possible source of energy. Concurrent with periodic and varied economic exploitations of the black shales are geologic ...January 1, 1983 Black shales of Devonian age in the Appalachian basin are a unique rock sequence. The high content of organic matter, which imparts the characteristic lithology, has for years attracted considerable interest in the shales as a possible source of energy.Black shales are de®ned as generally ®ne-grained sediments or sedimentary rocks that contain .1% total organic carbon (TOC). Deep water in the marine environment is taken as any depth in excess of storm wave base (i.e. approximately 200 m). Much of this synthesis is based on previous work by the authors on deep-water processes (Sediment ...The 2.1 Ga old black shales of the Franceville Series, Republic of Gabon (Fig. 1) rank as one of the major Precambrian accumulations of organic matter.In size, the only closely comparable Proterozoic accumulation of organic matter is shungite from the Jatulian Series of Russian Karelia (see McKirdy and Imbus, 1992).In Gabon, uranium ores occur within quartzose sandstones at the top of the FA ...A possible, but untested, sequestration strategy is to inject CO{sub 2} into organic-rich shales. Devonian black shales underlie approximately two-thirds of Kentucky and are thicker and deeper in the Illinois and Appalachian Basin portions of Kentucky than in central Kentucky. The Devonian black shales serve as both the source and trap for ...Whole rock Hf isotope systematics of black shales from the Australian Pilbara craton, selected to exclude detrital zircon components, are employed to evaluate the evolution of the Archean crust ...The organic carbon-poor black shales are characterized by large amounts of dinocysts. Higher runoff coeval with black shale deposition is suggested by the common occurrence of freshwater algae such as Pediastrum, Scenedescus and various Tasmanitaceae, temporarily forming abundance peaks up to 90% of the total fraction [Fiet, 1998].N2 - Outlines the salient features and inferred depositional regimes for black shales in the stratigraphic record and provide guidelines for further study. Includes a discussion of OC preservation in modern marine environments as a prelude to interpretation of the ancient record, and of proposed biotic and geochemical indicators of degree of ...The Upper Cambrian Alum Shale of Scandinavia and the Lower Jurassic Posidonia Shale of Germany are potential targets for shale gas extraction (Horsfield et al., 2010).Five overmature black shale samples from the Alum Shale of Bornholm, Denmark (Schulz et al., 2015) and the Posidonia Shale of the Hils Syncline (Rullkötter et al., 1988), all taken from whole cores, were chosen for our ...This study involves a comprehensive and detailed lithological, sedimentalogical, structural and geochemical description of the lower Ecca Group in the Eastern Cape, South Africa. The Ecca group hosts a ~ 245 million year old organic-rich black shale, which has recently been the focus of interest of petroleum companies worldwide. The shale was deposited under anoxic conditions in a setting ...A global compilation of Mo isotope data from black shales indicates that the Mo isotopic variations have a consistent temporal trend, reflecting the oxygen evolution of the oceans. Relatively light δ 98/95 Mo values of the Lower Cambrian black shales compared to those of modern euxinic sediments are indicative of more widespread …Nov 1, 2001 · Both preservation and productivity models have been proposed for transgressive black shales. Thus, plankton bloom-stimulated anoxia is commonly invoked (Leckie et al., 1990, Middelburg et al., 1991, Coveney et al., 1991), whereas others have suggested they may record the expansion of ‘normal’ basinal conditions during base-level rise, with the result that sub-pycnocline deposition is ... Find the perfect black shale stock photo, image, vector, illustration or 360 image. Available for both RF and RM licensing.Lowermost Silurian (Rhuddanian, lower Llandovery) black shales represent the main Palaeozoic petroleum source rock throughout North Africa and Arabia. The unit also occurs in parts of Morocco with recorded TOC values of up to 10.5%. However, in contrast to many other North African and Arabian countries, the Silurian‐Lower Devonian shale‐dominated succession in Morocco also contains a ...The Lungmachi black shales range in age from the Normalograptus persculptus Biozone of the uppermost Ordovician to the Spirograptus guerichi Biozone of the lower Telychian, and ten graptolite biozones can be recognized within this unit. The basal and upper contacts of the Lungmachi black shales are diachronous.Black shales occur widely in the Lower Cambrian and Neoproterozoic strata on the Yangtze Platform, South China. In this study, Lower Cambrian black shales from Xiuning section and Late Neoproterozoic black shales from Weng'an section were studied and Pb isotopic compositions were analyzed following a stepwise acid-leaching technique. The 206 Pb/ 204 Pb ratios in both sections show large ...Devonian Black Shales Eastern USChattanooga, New Albany, Ohio Shales. The Mid-Late Devonian black shales of the Appalachian, Illinois, and Michigan Basins have long been studied to provide clues to past climates, ocean ventilation, mass extinctions, and general earth history. Common misconceptions about these shales are that they represent ...Black shale. A dark, thinly laminated carbonaceous shale, exceptionally rich in organic matter (5% or more carbon content) and sulfide (esp. iron sulfide, usually pyrite), and often containing unusual concentrations of certain trace elements (U, V, Cu, Ni). Alabama - Arizona - Illinois - Indiana - Kentucky - Massachusetts - Maryland - Maine ... The black shale of the Niutitang Formation is characterized by elevated TOC contents reaching up to 15 wt% at the lower part and decreased to 3-9 wt% upward over a stratigraphic thickness of about 20 to 80 m. Some units up to 30-m-thick consist of alginate with > 30 wt% C (combustible shale). Since first discovered in the 1970 s, the genesis ...A possible, but untested, sequestration strategy is to inject CO{sub 2} into organic-rich shales. Devonian black shales underlie approximately two-thirds of Kentucky and are thicker and deeper in the Illinois and Appalachian Basin portions of Kentucky than in central Kentucky. The Devonian black shales serve as both the source and trap for ...Dunkirk black shale extends from Van Buren Point, on Lake Erie, to Holland, [western New York], where it is over 160 feet thick. Two characteristic (and unlike) septarian zones divide it into three members, throughout this distance, the upper of which was included by Luther in his overlying Portland shales. Included in Chemung group.Stow et al. (2001) stated that black shales are fine-grained sediments or sedimentary rocks with total organic carbon (TOC) content of >1%. It has been proposed that black shale was closely related to OM-rich shale, but it was formed under dysoxic or anoxic conditions, and does not always have high TOC contents (Kemp, 1991; Wignall …Black shales are very common at the middle part of the Xiamaling Formation in the Yanliao area and are distributed in an area that is > 400 km long and 200 km wide, from western Liaoning Province to northwestern Hebei Province. The black shales are 50 to 260 m thick and have TOC concentrations ranging from 2 to 20 wt% [117, 118].In the outer Lesser Himalaya, black shales are present in the Infra-Krol, Krol, and Tal formations extending from Solan in the Himachal Himalaya to Nainital in the Kumaun Himalaya (Fig. 1). Black shales associated with the Infra-Krol and Upper Krol formations occur in and around Solan, Mussoorie, Garhwal, and Nainital (Fig. 1).The presence of Ediacaran fossils and stromatolites, chert, quartz ...The overlying ∼2.6 Ga-Black Reef Formation separates the Ventersdorp Supergroup from the Chuniespoort Group, in the Transvaal Supergroup. The Chuniespoort Group hosts the Malmani Subgroup black shales that formed in a shallow seaway, constrained by detrital zircon U−Pb dating to an age of ∼2.588 ± 0.006–2.46 ± 0.005 Ga .The primary source of manganese to the Baltic Sea has been attributed (Suess, 1979) to input of terrestrially domi- nated organic matter. However, we have not found any mac- rofossils of terrestrial origin. Manganese-rich sediments are roughly 2 m thick and contain on average 2 to 5% manga- nese.. To test whether there is a positive relation between MSA Colour: Black, Grey Group: Clastic Sedimentary Rock Texture: Clastic; Black shales of the Late Devonian to Early Mississippian Bakken Formation are characterized by high concentrations of organic carbon and the hyper-enrichment (> 500 to 1000s of mg/kg) of V and Zn. Deposition of black shales resulted from shallow seafloor depths that promoted rapid development of euxinic conditions. Vanadium hyper-enrichments, which are unknown in modern environments, are ... Dec 1, 2014 · Black shales were deposited in the continental The paleoenvironment during the Early Cambrian is closely related to the accumulation mechanism of organic matter (OM) from the Lower Cambrian black shales. However, paleoenvironment remains a controversial issue. Here, we reported a lot of detailed data of sedimentary stratigraphy and geochemistry of the Lower Cambrian Yuertusi Formation in the Aksu area, Tarim Basin. The Yuertusi Formation ... Black shale statistics, Hole 53OA, Angola Basin. Core. 86. ...

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