Results 71 to 80 of about 928 (188)

Tellurium and Mercury in Late Cretaceous to Early Eocene Sediments as Proxies for Volcanic Activity in the Deccan and North Atlantic Large Igneous Provinces

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 2, February 2025.
Abstract Late Maastrichtian to Early Eocene sediments from Wadi Nukhul, Egypt were deposited between about 67 and 55.5 Ma during the eruption of the Deccan Traps and the North Atlantic Igneous Province (NAIP). We use Te and Hg as proxies for volcanism to constrain the timing of flood basalt volcanism relative to environmental perturbations and ...
Nils Björn Baumann, Marcel Regelous, Thierry Adatte, Anette Regelous, Karsten M. Haase, Hassan Khozyem   +5 more
wiley   +1 more source

Paleo-humidity changes in a tropical Aptian continental to transitional system: a case study from the Araripe Basin, Northeastern Brazil [PDF]

Brazilian Journal of Geology
Although many paleogeographic reconstructions depict equatorial Brazil as being predominantly arid during the Aptian, studies using palynomorphs suggest climatic fluctuations between humid and arid phases.
Marcos Antonio Batista dos Santos Filho, Marcelo Augusto De Lira Mota, Marlone Heliara Hünnig Bom, Lilian Maia Leandro, Daiane Ceolin, Marcelo de Araujo Carvalho, Guilherme Krahl, Jorge Villegas-Martín, Gerson Fauth, Mario Luis Assine, Francisco Henrique de Oliveira Lima   +10 more
doaj   +1 more source

Sulfur‐to‐Iron Ratio as a Proxy for Degree of Organic Sulfurization

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 1, January 2025.
Abstract The degree of organic sulfurization is broadly relevant yet underreported. We present a statistically significant correlation between whole rock S/Fe and the measured degree of organic sulfurization in the thermally immature Cenomanian–Turonian Eagle Ford Group.
K. L. French, J. E. Birdwell
wiley   +1 more source

The Jurassic–Cretaceous Transition in the Slovenian Basin (Alpine Atlantic): Further Evidence for Palaeoenvironmental Record in Pelagic Sediments

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 12, December 2024.
Abstract Over the vast area of present‐day Europe, the Tithonian–Berriasian transition was a time of climate aridization, which was supposedly related to the more general trend of the latest Jurassic–earliest Cretaceous cooling and restrictions in atmospheric circulation.
D. G. Lodowski, J. Grabowski, B. Rožič, P. Žvab‐Rožič, D. Reháková, L. Slapnik, J. Iwańczuk, A. Chmielewski, A. Teodorski   +8 more
wiley   +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

Paleoredox conditions and shale gas potential of the Niutitang Formation: Insights from pyrite morphology, in situ trace elements, and Fe–S isotopes

Raw data for all figures in the manuscript by Miao Shi, Qinyuan Cao, Jinchuan Zhang, Bingsong Yu, Ye Yuan, Haoyu Lu, and Xiwei Wang to be published by Geochimica et Cosmochimica Acta as "Paleoredox conditions and shale gas potential of the Niutitang ...
Shi, Miao
core   +1 more source

Estratigrafía, sedimentología y geoquímica de las formaciones Chapiza y Hollín en la Zona Subandina : Estratigrafía, sedimentología y geoquímica de la Formación Hollín en la Zona Subandina Subandina.

, 2022
Este trabajo se basó en el uso de herramientas geoquímicas como la quimioestratigrafía y diagramas geoquímicos discriminatorios (litogeoquímica), con las siguientes aplicaciones: clasificación litológica, proveniencia, composición de sedimentos ...
Maya Ortiz, Daniel Sebastián
core  

A reverse biomarker-derived maturity trend in Triassic Yanchang Formation shales from the Ordos Basin in China

Natural Gas Industry B
Organic-rich shales from the Triassic Yanchang Formation in the Ordos Basin in China are mainly derived from aquatic organisms with type II kerogen. A reverse maturity trend, derived from the commonly used biomarker maturity parameter Ts/(Ts + Tm) occurs
Xiaoliang Chen, Haiping Huang, Mingming Yan, Bin Zhang, Wei Wang, Zhiguo Mao, Dehao Bai, Dahai Zhao, Qihao Li   +8 more
doaj   +1 more source

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

The late Silurian Xiaoxiang Vertebrate Fauna in South China inhabited a tropical nearshore marine environment

Frontiers in Ecology and Evolution
The late Silurian Xiaoxiang Vertebrate Fauna, represented by the gnathostome placoderms Entelognathus and Qilinyu, as well as the osteichthyans Guiyu and Megamastax, is mainly hosted in the Ludlow Kuanti Formation in the Qujing area, East Yunnan, South ...
Jia-Chen Cai, Jia-Chen Cai, Hao-Ran Sun, Hao-Ran Sun, Wen-Jin Zhao, Wen-Jin Zhao, Min Zhu, Min Zhu   +7 more
doaj   +1 more source