Results 31 to 40 of about 8,093,557 (158)

Geochemical properties and heavy metal contents of carbonaceous rocks in the Pliocene siliciclastic rock sequence from southeastern Denizli-Turkey

Open Geosciences, 2022
Pliocene-aged carbonaceous rocks of varying thicknesses, alternating with siliciclastic and carbonate rock units, are located on the northern border of the Çameli-Acıpayam basin (in southwestern Turkey), which is filled with thick Neogene sediments ...
Koralay Tamer, Koralay Demet Banu
doaj   +1 more source

Geochemical characteristics and paleoenvironmental implications of beachrocks in northwestern Hainan Island

Frontiers in Earth Science
A systematic investigation was performed on the petrological and geochemical characteristics of Late Pleistocene beachrocks in the Paipu area, Danzhou City, northwestern Hainan Island.
Chaoyun Yang, Chaoyun Yang, Dongfeng Jiao, Dongfeng Jiao, Yihua Lin, Yihua Lin, Dingyong Liang, Dingyong Liang, Zhaoying Lv, Zhaoying Lv, Changxin Wei, Changxin Wei   +11 more
doaj   +1 more source

Formation conditions and enrichment mechanisms of the Jurassic lacustrine organic-rich shale in the East Fukang Sag, Junggar Basin, NW China: A reassessment based on organic geochemistry

Frontiers in Earth Science, 2023
Chemical composition of sediments is often used to evaluate paleoclimate condition, provenance, tectonic setting, depositional condition, and paleoproductivity. However, the validity of these proxies has long been questioned.
Jinqi Qiao, Jinqi Qiao, Qingyong Luo, Qingyong Luo, Ye Zhang, Ye Zhang, Dandan Wang, Dandan Wang, Hao Cui, Hao Cui, Xiaoqing Shang, Luofu Liu, Luofu Liu, Tong Zhang   +13 more
doaj   +1 more source

A quantification of the effect of diagenesis on the paleoredox record in mid-Proterozoic sedimentary rocks [PDF]

, 2021
Iron speciation in ancient sedimentary rocks is widely used to reconstruct oceanic redox conditions over geological time, specifically to assess the extent of oxic, euxinic (anoxic containing sulfide), and ferruginous (anoxic containing iron) conditions.
Hutchings, Alec M., Turchyn, Alexandra V., Alexandra V. Turchyn, Alec M. Hutchings   +3 more
core   +3 more sources

Redox Conditions of the Late Ediacaran Ocean on the Southern Margin of the North China Craton

, 2023
Previous studies have revealed dynamic and complex redox conditions of the late Ediacaran ocean. Integrated analyses of Ediacaran successions on different continents can help to better understand global ocean redox conditions. In this study, we used iron
Jie Yang, Le Wan, Guodong Wang, Wei Jin, Zuoxun Zeng   +4 more
core   +1 more source

Geochemical and Hydrographic Evolution of the Late Devonian Appalachian Seaway: Linking Sedimentation, Redox, and Salinity Across Time and Space

Geochemistry, Geophysics, Geosystems, 2023
Continental interiors were flooded by epeiric seas during many intervals of the geologic past. Few modern analogs exist for these environments, however, and basic variables such as redox, salinity, and restriction are difficult to reconstruct in deep ...
Geoffrey J. Gilleaudeau, Wei Wei, Mariano N. Remírez, Yi Song, Timothy W. Lyons, Steven Bates, Ariel D. Anbar, Thomas J. Algeo   +7 more
doaj   +1 more source

The Paleoredox Setting of Burgess Shale-type Deposits

, 2010
Burgess Shale-type (BST) biotas occur globally in Lower and Middle Cambrian shales, and were preserved under specific and exceptional circumstances. Among the circumstances surrounding fossilization, benthic redox conditions have been the subject of ...
Droser, Mary L., Gaines, Robert, Mary L. Droser, Robert R. Gaines   +3 more
core   +2 more sources

Mineralogy and element geochemistry of the Sohnari rocks of Early Eocene Laki Formation in the Southern Indus Basin, Pakistan: Implications for paleoclimate, paleoweathering and paleoredox conditions

Energy Geoscience, 2023
The Sohnari Member of the Early Eocene Laki Formation is massively deposited in the Southern Indus Basin of Pakistan and is considered a potential source rock to generate hydrocarbons.
Asghar A.A.D. Hakro, Sajjad Ali, Abdul Shakoor Mastoi, Riaz Hussain Rajper, Rizwan Sarwar Awan, Muhammad Soomar Samtio, Hong Xiao, Xiaolin Lu   +7 more
doaj   +1 more source

Characteristics of paleoenvironment of Paleogene Wenchang Formation in Lufeng 15 Sub-sag, Pearl River Mouth Basin and its controlling effect on source rocks

Frontiers in Earth Science
The Pearl River Mouth Basin is a major hydrocarbon province offshore China, where the lacustrine mudstones of the Paleogene Wenchang Formation serve as the main hydrocarbon source rock.
Yangdi Zheng, Yangdi Zheng, Zhangbo Xiao, Zhangbo Xiao, Hongbo Li, Hongbo Li, Yu Sun, Yu Sun, Xingye Yang, Xingye Yang   +9 more
doaj   +1 more source

Fe–Mn Crust δ98Mo Decline Records Tectonic Forcing on Marine Oxide Sink Reduction During the Early Eocene–Early Oligocene

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract S, Tl, and W isotope records document pronounced early Eocene shifts in marine redox, yet the absence of a Mo isotope record obscures its progression. Here, we present ∼80 Myr Mo–Os–Be–Nd isotope profiles from a Northwest Pacific hydrogenetic Fe–Mn crust, revealing a systematic δ98Mo decline from −0.24‰ (early Eocene) to −0.83‰ (early ...
Limin Zhang, Jiangbo Ren, Hongjin Chen, Haozhe Wang, Zhen Sun, Yong Yang, Huodai Zhang, Zhenquan Wei, Lixue Zhang, Yingzhi Ren, Gaowen He   +10 more
wiley   +1 more source