Paleoceanographic Reconstruction of Upper Cretaceous ...
Thirteen black shales samples were taken from the Gulneri Formation at the North East of Ira q located at 44 26′ 23 ″ E and 36 12′ 43 ″ N. The outcrop belon gs to the Degala section and is 4
Thirteen black shales samples were taken from the Gulneri Formation at the North East of Ira q located at 44 26′ 23 ″ E and 36 12′ 43 ″ N. The outcrop belon gs to the Degala section and is 4
Basinal restriction, black shales, Re-Os dating, and the Early Toarcian (Jurassic) oceanic anoxic event J. M. McArthur,1 T. J. Algeo,2 B. van de Schootbrugge,3 Q. Li,1 and R. J. Howarth1 Received 8 February 2008; revised 20 July 2008; accepted 17 September 2008; published 24 December 2008.
Reports: UNI8 50400-UNI8: Testing the Extent of Anoxia in Late Devonian Aged Black Shales: A Multi-proxy Approach Diana L. Boyer, PhD , State University of New York, at Oswego Through the second year of the granting period significant advancements have been made in both field and laboratory work towards better understanding conditions ...
Redox-sensitive transition metals and their isotopes provide some of the best lines of evidence for reconstructing early Earth’s oxygenation history, including permanent atmospheric oxygenation following the Great Oxidation Event (GOE), ∼2.45−2.32 Ga. We show a shift from dominantly negative to permanently positive copper isotope compositions in black shales spanning ∼2.66−2.08 Ga.
The early Cambrian carbonaceous shale and laminated chert-phosphorite assemble (the black rock series) are widespread at the northwest margin of the Tarim Basin, Northwest China. In combination with previously reported data, we present stable molybdenum isotope (δ98/95Mo), TOC, and redox-sensitive trace elements to evaluate the sedimentary conditions in early Cambrian water column during the ...
An attempt is made in the present study to evaluate the sediment geochemistry and paleo-redox conditions of Devonian–Carboniferous black shales from the Spiti region, Tethys Himalaya, using multi proxy approach. Besides black shales, this paper also provides the first in-depth study of the geochemistry of phosphatic nodules (hosted by the ...
May 29, 2018· It is generally accepted that in mature shales, biomarkers and pyrolysis proxies are not very helpful in understanding the source/type of organic matter (OM), paleo-redox conditions during deposition, and thermal maturity. This study was to test the efficacy of these proxies in mature Marcellus Shale (VRo > 1). Samples were collected from oil-prone (WV-7) and gas-prone (WV-6) wells in Wetzel ...
Control of various factors, including mineral components, primary productivity and redox level, on the total organic carbon (TOC) in the lower Cambrian black shale from southeastern margin of Upper Yangtze (Taozichong, Longbizui and Yanbei areas) is discussed in detail in this article. Mineral components in the study strata are dominated by quartz and clay minerals.
Aug 12, 2019· Deposition of black shales was widespread in the Cambrian oceans (541–488 Ma) 1.In the past decade, various geochemical redox proxies have been used to associate black shale …
Highlights•Permian weathering of black shale took place at dry climate.•Palaeoenvironmental geochemical proxies, such as U/Th, Ni/Co, Mo have been altered by weathering.•Elements bound to iron sulphides are especially prone to ...
Geochemical Characterisation of the Tremadocian Black Shale in North-Western Estonia 1 Geochemical Characterisation of the Tremadocian Black Shale in North- ... The examined trace element proxies suggest the deposition in an anoxic or euxinic environment. Addi-tionally, the available historical geochemical data from the same drill cores were ...
Cu isotopes in marine black shales record the Great Oxidation Event Ernest Chi Frua,1, Nathalie P. Rodrígueza, Camille A. Partinb, Stefan V. Lalondec, Per Anderssond, Dominik J. Weisse, Abderrazak El Albanif, Ilia Rodushking, and Kurt O. Konhauserh aDepartment of Geological Sciences and Bolin Centre for Climate Research, Stockholm University, SE-10691 Stockholm, Sweden; bDepartment of Geological
Devonian Black Shales Eastern US Chattanooga, 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.
black shales to match any proxy regression with a. particular shale. However, this technique, once re-fined, has the potential to ‘‘rescue ...
An attempt is made in the present study to evaluate the sediment geochemistry and paleo-redox conditions of Devonian-Carboniferous black shales from the Spiti region, Tethys Himalaya, using multi proxy approach. Besides black shales, this paper also provides the first in-depth study of the geochemistry of phosphatic nodules (hosted by the black ...
Summary Expanded successions of marine black shale provide important proxy records to test climatic teleconnections across ocean basins and paleo-latitudes. The causal and generic relationships controlling the timing, composition, and internal variability of marine organic carbon (OC)-rich shale over large distances and during variable global climate states are, however, far from understood ...
Assuming increased temperature is a function of increased atmospheric CO 2, and that glacioeustatic sea-level can serve as a proxy for temperature due to changing ice volume, we infer that the deposition of transgressive black shales may have acted as a negative feedback mechanism, drawing down CO 2 and preventing the onset of runaway ...
Uranium Spectral Gamma-Ray Response as a Proxy for Organic Richness in Black Shales: Applicability and Limitations
Multiple Proxies on the Paleoenvironment of the Early Cambrian Marine Black Rock Series in the Tarim Basin, NW China: Molybdenum Isotope and Trace Element Evidence Chunyan Yao, Weimin Guo, Junan Liu, Hanwu Li Nanjing Center, China Geology Survey, Nanjing, China Abstract The early Cambrian carbonaceous shale and laminated chert-phosphorite as-
Science Issue and Relevance. Black shales have been of increasing interest in recent years due to their oil and gas potential, but also because many are enriched in nonfuel "unconventional" critical elements such as cobalt, chromium, molybdenum, nickel, platinum group elements, rhenium, and vanadium.
The mineralogical and chemical compositions of Lower Carboniferous (Tournaisian) marine black shale from the Kowala quarry, the Holy Cross Mountains, …
average black shale chemostratigraphy by displaying a depleted REE pattern. The depleted REE patterns are aligned with other redox proxies, such as, high V/V+Ni and degree of pyritization values, as well as extremely light and enriched δ34S values, which suggest “event black shales” formed under intense redox conditions.
In general, the Mo proxy for original TOC content, while approximate, works for oxygen-deficient sites of deposition where other proxies for C loss, such as C org /S py ratios in normal (oxic) marine shales, do not apply. Estimates of original TOC from Mo content in samples spanning the geologic record, combined with paleogeography and ...
The CM-rich black shales studied here come from drill cores (COMILOG) from the Bangombé Plateau, Moanda, Gabon. These shales are of Paleoproterozoic age (2.1 Ga), belonging to the upper part of the FB series (Weber, 1968).Based on X-ray diffraction analyses, the shales are composed of dolomite and manganese carbonates with variable contents of quartz, muscovite, kaolinite, illite-smectites ...
Ancient black shales have considerable potential for generation of long, high-resolution paleoclimate proxy records because (1) primary laminae are preserved at a fine (commonly sub-mm) scale, yielding information regarding high-frequency changes in environmental conditions (e.g., Hay et al.
Paleoceanographic Reconstruction of Upper Cretaceous, Black Shale Succession, Northeastern Iraq Using Geochemical Proxies to Indicate Paleoredox and Paleoenvironment Conditions Khaldoun Ibrahim Ahmad1, Salah Ali Hussain2 and Mutadhid Al-Obaidi3 1Department of Geosciences - University of Missouri -Kansas City USA
Anoxia and fluctuating climate recorded from the Devonian–Carboniferous black shales, Tethys Himalaya, India: a multi-proxy approach. International Journal …
However, gaps in our fundamental knowledge of Mo burial within sediments hinder the utility of Mo as a proxy for paleo-redox reconstruction. To improve our understanding of Mo burial pathways and sedimentary Mo speciation, we present combined geochemical analysis and X-ray absorption fine structure spectroscopy from black shales deposited in ...
The Talvivaara black shale-hosted Ni-Zn-Cu-Co deposit occurs in eastern Finland (Fig. 9.1.1) and is currently the largest sulfidic Ni resource under exploitation in Western Europe.It is a low-grade (0.22 wt% Ni, 0.50 wt% Zn, 0.13 wt% Cu, 0.02 wt% Co, 0.0017 wt% U at Ni cutoff of 0.07 wt%) but very large deposit with total ore resources (measured + indicated + inferred) reaching 2.053 Gt ...
Report: Testing the Extent of Anoxia in Late Devonian Aged Black Shales: A Multi-proxy Approach (56th Annual Report on Research Under Sponsorship of The American Chemical Society Petroleum Research Fund): 56th Annual Report on Research Under Sponsorship of The American Chemical Society Petroleum Research Fund
MARCASITE IN BLACK SHALES—A MINERAL PROXY FOR OXYGENATED BOTTOM WATERS AND INTERMITTENT OXIDATION OF CARBONACEOUS MUDS JUERGEN SCHIEBER Department of Geological Sciences, Indiana University, Bloomington, Indiana 47405, U.S.A. ABSTRACT: Black shales in the geologic record have long been considered to reflect deposition under anoxic or even euxinic
May 03, 2016· Copper concentrations in shales and BIFs are compiled from the literature and unpublished data (see Datasets S1 and S2). The black shale samples analyzed in this study originate from marginal marine sediments deposited from ∼2.66–2.084 Ga. South African samples cover a drill core depth of 85–2,440 m, with ages constrained to ∼2.66–2 ...
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