Results 1 to 10 of about 224 (113)

Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1a [PDF]

Scientific Reports
The Early Aptian Oceanic Anoxic Event 1a (OAE 1a) marks a period of global marine anoxia linked to volcanic activity and climate changes during the Cretaceous. This study analyzes a ~ 40-m-thick Lower Aptian succession from the Kazhdumi Intrashelf Basin,
Arman Jafarian, Antun Husinec, Ardiansyah Koeshidayatullah, Xi Chen, Meng Wang, Clemens Vinzenz Ullmann, Abdus Saboor, Kaibo Han, Chengshan Wang   +8 more
doaj   +2 more sources

Lithotectonic setting, paleoweathering, maturity, sediment recycling and paleoredox conditions of quaternary alluvium from Mayo Sina (Tchad). A geochemical approach [PDF]

Heliyon
The alluvial material in the two PITs of the Mayo Sina in the southern part of Chad, were subjected to a geochemical analysis in order to determine the source rock lithological composition, tectonic context, degree of weathering, type of climate at the ...
Amaya Adama, Bisse Salomon Bertrant, Bokanda Ekoko Eric, Akono Daniel Florent, Belinga Belinga Cédric   +4 more
doaj   +2 more sources

Tectonoclimatic controls on Paleogene braided river delta evolution and petroleum systems in the Lenghu tectonic belt, northern Qaidam Basin [PDF]

Scientific Reports
The Paleogene braided river delta deposits in the Lenghu tectonic belt of the northern Qaidam Basin document an environmental transition critical for understanding regional petroleum systems.
Lei Gong, Wenhai Gai, Xianzhi Gao, Zesheng Hou   +3 more
doaj   +2 more sources

Oxidative uptake of Ce by oceanic ferromanganese crusts and implications for paleoredox estimates using Ce isotopes [PDF]

Communications Earth & Environment
The oxidative enrichment and isotopic fractionation of cerium (Ce) in contact with vernadite (δ-MnO2) serve as a proxy for past redox conditions in both terrestrial and marine environments.
Alain Manceau, Jianlin Liao, Yan Li, Andrea Giacomelli, Marius Retegan, Andrea Koschinsky, Stephan N. Steinmann, Olivier Mathon   +7 more
doaj   +2 more sources

Geochemistry of Major and Trace Elements in Sediments From the Lubei Plain, China: Constraints for Paleoclimate, Paleosalinity, and Paleoredox Environment

Journal of Asian Earth Sciences: X, 2021
As has been greatly affected by sea-level fluctuations since the Holocene, the Lubei Plain is featured by typical marine and alluvial deposits that records abundant information on the environmental evolution.
Liang zhou, Longjiang Mao, Zhihai Tan
exaly   +3 more sources

Multiproxy Analysis of Paleoredox Conditions, Paleoproductivity and Organic Matter Enrichment in Cretaceous Mudrocks of Bombe-Ediki and Environs in the Douala Sub-Basin

Solid Earth Sciences
The formation and preservation conditions of organic matter-rich mudrocks in the Edki-Mabonji and Mbalangi-Bombe area of the Northwestern section of Douala sub-basin, Cameroon, can play an important role in the accumulation of hydrocarbon.
Roger Ngia Ngong, Elie Fosso Menkem, Christopher M Agyingi   +2 more
exaly   +3 more sources

Depositional environment of the late Paleocene-early Eocene Sinjar Formation, Iraq: Implications from facies analysis, mineralogical and geochemical proxies [PDF]

Heliyon
Reconstruction of the depositional environment of the Paleocene-Eocene Sinjar Formation from two outcrop sections in northwestern and northeastern Iraq has been evaluated using the traditional petrographic and facies analysis supported by X-ray ...
Noor T. Al-Taee, Ali I. Al-Juboury, Imad M. Ghafor, Giovanni Zanoni, Harry Rowe   +4 more
doaj   +2 more sources

Geochemistry of the early Cambrian succession in the western Anti-Atlas, Morocco: implications on provenance and paleoredox conditions [PDF]

Estonian Journal of Earth Sciences, 2023
The Igoudine and Amouslek formations (Terreneuvian–Cambrian Epoch 2 boundary) in the western Anti-Atlas of Morocco record the replacement of stromatolite-dominated microbial consortia by thrombolite-metazoan consortia.
Abdelfattah Azizi, Abderrazak El Albani, Khadija El Hariri, Asmaa El Bakhouch, Olev Vinn, Ahmid Hafid, Kalle Kirsimäe   +6 more
doaj   +1 more source

Postdepositional Behavior of Molybdenum in Deep Sediments and Implications for Paleoredox Reconstruction

Geophysical Research Letters, 2023
Molybdenum (Mo) is a trace element sensitive to oceanic redox conditions. The fidelity of sedimentary Mo as a paleoredox proxy of coeval seawater depends on the extent of Mo remobilization during postdepositional processes. Here we present the Mo content
Jingbo Nan, Man‐Yin Tsang, Jie Li, Male Köster, Susann Henkel, Fanyu Lin, Weiqi Yao   +6 more
doaj   +1 more source

Relative Sea-Level Fluctuations during Rhuddanian–Aeronian Transition and Its Implication for Shale Gas Sweet Spot Forming: A Case Study of Luzhou Area in the Southern Sichuan Basin, SW China

Journal of Marine Science and Engineering, 2023
Most scholars believe that transgression events can contribute positively to organic matter enrichment and shale gas sweet spot development, while whether or not regression events are conducive to shale gas sweet spot development remains to be further ...
Tianqi Zhou, Qingzhong Zhu, Hangyi Zhu, Qun Zhao, Zhensheng Shi, Shengxian Zhao, Chenglin Zhang, Ling Qi, Shasha Sun, Ziyu Zhang, Lin Zhu   +10 more
doaj   +1 more source