Results 81 to 90 of about 8,093,557 (158)

Application of the Ce anomaly as a paleoredox indicator: The ground rules

, 2010
Much attention has been paid, in recent years, to the potential application of the Ce anomaly, measured in various marine phases, as a paleoceanographic indicator of widespread marine anoxia.
German, Christopher R., Elderfield, Henry   +1 more
core   +1 more source

Paleoredox Conditions, Paleoproductivity, and Depositional Environment of an Eocene Black Shale: Mahogany Zone, Green River Formation, Eastern Uinta Basin, Utah

, 2019
honors thesisCollege of Mines & Earth SciencesGeology & GeophysicsLauren BirgenheierBlack shales are commonly assumed to record anoxic, organically productive paleoenvironments.
Worms, Katherine
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Evaluating the Application of Elemental and Isotopic Ratios as Paleoredox Tracers in Earth's Oceans and Mars' Aqueous Alteration [PDF]

This dissertation critically evaluates the application of elemental and isotopic ratios as paleoredox tracers in early Earth’s oceans and on early Mars’ surface.
Liu, Xinyi
core   +1 more source

Depositional Environment as Main Controlling Factor for Low TOC Sediments in the Early Carboniferous Dawuba Formation of the Qiannan Depression

Geosciences
The evolution of the sedimentary environment in the Early Carboniferous Dawuba Formation of the Qiannan Depression significantly controlled the distribution of low-total organic carbon (TOC) sediments.
Yuzuo Liu, Jiao Wang, Tuo Lin, Dongxiao Li, Jie Chen, Shengzhu Wang, Wanzhong Shi, Ren Wang, Xiaoming Zhang, Xiaofeng Xu, Kai Liu   +10 more
doaj   +1 more source

Spatial heterogeneity in nutrient utilization during the end-Devonian ocean anoxic event: a case study of the Western Canada sedimentary basin

Frontiers in Earth Science
The Devonian-Carboniferous (D-C; 359 Ma) boundary is marked by widespread deposition of organic-matter-rich black shales associated with the Hangenberg mass extinction event.
Sanjukta Dhar, Mason N. Frucci, Mason N. Frucci, Stacy C. Atchley, James M. Fulton   +4 more
doaj   +1 more source

Research advance for uranium isotope as a quantitative proxy for paleo-oceans anoxic or oxic environment

Carsologica Sinica
Compared with other elements that are sensitive to redox environments (U, Mo, V, S, Fe, Cu, Zn, Ni), uranium isotopes have the advantage to quantitatively reflect long-term and global-scale paleoredox of oceans, due to its uniform composition in the ...
Qukan LUO, Jianhua CAO, Liang ZHONG, Bing BAI, Qigang WANG, Hongwei LIAO, Keqing ZONG, Hanlian QIN   +7 more
doaj   +1 more source

Orbital cycle records in shallow unconsolidated sediments: implications for global carbon cycle and hydrate system evolution in deep-sea area sediments of the Qiongdongnan Basin

Frontiers in Marine Science
IntroductionMilankovitch theory has extensive application in sequence stratigraphy and the establishment of time scales. However, it is rarely applied to shallow strata rich in hydrates.
Yang Dong, Yang Dong, Ren Wang, Ren Wang, Jinqiang Liang, Yulin He, Jinfeng Ren, Wanzhong Shi, Wanzhong Shi, Xiaosong Wei, Xiaosong Wei, Hao Du, Hao Du, Xiangyang Xie, Arthur B. Busbey   +14 more
doaj   +1 more source

Integrated Geochemistry and Sedimentology of the Wolfcamp B3 and B2 Intervals, Midland Basin, TX [PDF]

, 2019
The Permian-aged, hydrocarbon-rich, mixed carbonate-siliciclastic mudrocks of Midland Basin Wolfcamp B2 and B3 are highly heterogeneous, making paleoenvironmental reconstruction difficult.
Lopez-Gamundi, Cecilia
core  

The paleoredox context of early eukaryotic evolution: insights from the Tonian Mackenzie Mountains Supergroup, Canada

Tonian (ca. 1000-720 Ma) marine environments are hypothesised to have experienced major redox changes coinciding with the evolution and diversification of multicellular eukaryotes.
Bui, TH, Maloney, KM, Halverson, GP, Lechte, M, Gibson, TM, Schiffbauer, JD, Laflamme, M   +6 more
core   +1 more source

Examining the limitations of 238U/235U in marine carbonates as a paleoredox proxy [PDF]

, 2018
: Variations of 238U/235U in sedimentary carbonate rocks are being explored as a tool for reconstructing oceanic anoxia through time. However, the fidelity of this novel paleoredox proxy relies on characterization of uranium isotope geochemistry via ...

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