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

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geochemistry Geophysics Geosystems Pub Date : 2025-02-22 DOI:10.1029/2024GC011967
Nils Björn Baumann, Marcel Regelous, Thierry Adatte, Anette Regelous, Karsten M. Haase, Hassan Khozyem
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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 extinction events during this period. We find enrichment in Te in the latest Maastrichtian and earliest Danian and in the Late Paleocene to Early Eocene, which result from enhanced volcanic input of Te. An increase in volcanic Te during the Late Maastrichtian coincides with the Late Maastrichtian Warming Event. A second larger peak in Te begins about 120–80 kyr before the Cretaceous/Paleogene boundary (KPB) and continues into the Danian, with highest values about 70–30 kyr prior to the KPB, potentially related to eruptions of the voluminous Deccan Wai subgroup. The Chicxulub impact, therefore, did not trigger these eruptions, and Deccan volcanism likely led to climate instability, which may have amplified the environmental effects of the impact. A 6 Myr period of low Te during the Paleocene is followed by an increase in Te starting at 57.5 Ma and peaking at the Paleocene-Eocene boundary (PEB; 56 Ma) during the opening of the North Atlantic and the highest eruptive rates of the NAIP. In contrast, Hg variations over the same time period are less systematic. Our results show that Te in sediments may be a robust proxy, complementary to Hg, for large volcanic events.

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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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