Results 51 to 60 of about 928 (188)

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

Extending the utility of the Tl isotope paleoredox proxy to carbonates

Goldschmidt2025 abstracts
Thallium isotope ratios (205Tl/203Tl) recovered from ancient marine shales are able to provide novel information about Earth’s ocean oxygenation history. Here we demonstrate the potential to extend this utility to the ancient carbonate record. We present Tl concentration and isotope ratio data for modern and geologically recent carbonates from the ...
Shu, Yunchao, Ostrander, Chadlin, Hardisty, Dalton, Swart, Peter, Nielsen, Sune   +4 more
openaire   +2 more sources

Reconstructing Environmental and Microbial Ecosystem Changes Across the Permian–Triassic Mass Extinction at Lusitaniadalen, Svalbard

Paleoceanography and Paleoclimatology, Volume 41, Issue 2, February 2026.
Abstract The Permian–Triassic environmental crisis triggered fundamental changes in marine ecosystems, culminating in the most severe biodiversity crisis of the Phanerozoic. Yet, the environmental and geochemical conditions governing the crisis and ecosystem recovery remain debated.
S. Z. Buchwald, A. B. Frank, D. Birgel, K. Senger, T. Mosociova, Y. Pei, B. Beaty, L. G. Tarhan, F. Galasso, M. A. Gómez Correa, S. E. Grasby, U. Struck, D. Yuan, R. Steinkrauss, J. Gliwa, N. Lahajnar, J. Peckmann, W. J. Foster   +17 more
wiley   +1 more source

Origin and paleoenvironmental conditions of iron duricrust in the Paleogene N’kapa Formation, Douala sub-basin, Cameroon

Geosystems and Geoenvironment
This paper unravels rarely studied paleoenvironmental conditions and origin of iron duricrust in the Paleogene N’kapa Formation, Douala sub-basin, Cameroon. It integrates petrographic and geochemical techniques (mineralogy, trace, major and REEs elements)
Kevin Jorex Voufor Tsafack, Ngong Roger Ngia, Christopher Fuanya, Christopher M. Agyingi, Elie Fosso Menkem, Alexandrine N’nanga, Median Yongye, Ligbwah Victor Wotanie   +7 more
doaj   +1 more source

Environmental Controls on the Cycling of Fe and Mn in Patagonian Fjord Systems

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 1, January 2026.
Abstract Fjord sediments are important reservoirs and conduits of potentially bioavailable iron (Fe) and manganese (Mn). Both elements are critical to life, serving as key reactants in metabolic pathways, and play an important role in the reactivity and burial of organic carbon.
L. Piret, J. R. Hawkings, L. Hopf, D. McCabe   +3 more
wiley   +1 more source

Supplementary data for: Extending the utility of the Tl isotope paleoredox proxy to carbonates

Supplementary data for: Extending the utility of the Tl isotope paleoredox proxy to ...
Ostrander, Chadlin
core   +1 more source

Paleoenvironmental changes across the Paleocene–Eocene boundary in West Central Sinai, Egypt: geochemical proxies

Swiss Journal of Geosciences, 2020
A geochemical analysis has been conducted on twenty-six sediment samples spanning the P–E boundary interval collected from the Esna Shale in three well-dated stratigraphic sections in west-central Sinai, Egypt to interpret paleoenvironmental changes ...
Ibrahim Mohamed Ghandour
doaj   +1 more source

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

Effects of Thermal Alteration on Paleoredox Proxies in Black Shales: Best Practices and Reasons for Caution and Optimism

Raw data for all figures in the manuscript by Chenyi Tu and others as "Effects of Thermal Alteration on Paleoredox Proxies in Black Shales: Best Practices and Reasons for Caution and Optimism"
Tu, Chenyi
core   +1 more source