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Lithium isotope evidence for a plumeworld ocean in the aftermath of the Marinoan snowball Earth.
Proc Natl Acad Sci U S A
November 2024
Department of Geosciences, Virginia Tech, Blacksburg, VA 24061.
Article Synopsis
- The snowball Earth hypothesis suggests that during the Marinoan ice age around 635 million years ago, continental chemical weathering was greatly reduced but then increased afterward.
- Research conducted on lithium isotope compositions in rock layers from South China shows a distinct trend of decreasing lithium levels as distance from the shore increases, indicating the mixing of meltwater and hypersaline seawater.
- The findings support the idea that during this period, weak weathering on land and strong reverse weathering on the ocean floor influenced the chemistry of the oceans, aligning with the plumeworld hypothesis.
Sedimentary provenance supports a mid-paleozoic tectonic connection between the Junggar and Altai terranes in central Asia.
Sci Rep
September 2024
Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, The Ministry of Education, School of Energy Resources, China University of Geosciences, Beijing, 100083, China.
The provenance of Precambrian detritus in the Junggar and Altai terranes provides crucial constraints on the peri-Siberian accretionary tectonic evolution in the middle Paleozoic. The Precambrian detrital zircons have no coeval magmatic equivalents in the Junggar terrane but show U-Pb age spectra and ε(t) values comparable to those in the Altai terrane. The correlations suggest that the old detrital materials in the Junggar and Altai terranes were most likely derived from the Siberia craton and adjacent Tuva-Mongolian microcontinent.
View Article and Find Full Text PDFMercury isotope fractionation and mercury source analysis in coal.
Sci Total Environ
December 2024
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China. Electronic address:
Understanding the sources of mercury (Hg) in coal is crucial for understanding the natural Hg cycle in the Earth's system, as coal is a natural Hg reservoir. We conducted analyses on the mass-dependent fractionation (MDF), reported as δHg, and mass-independent fractionation (MIF), reported as ΔHg, of Hg isotopes among individual Hg species and total Hg (THg) in Chinese coal samples. This data, supplemented by a review of prior research, allowed us to discern the varying trend of THg isotope fractionation with coal THg content.
View Article and Find Full Text PDFArchaean multi-stage magmatic underplating drove formation of continental nuclei in the North China Craton.
Nat Commun
July 2024
College of Earth Sciences, Jilin University, Changchun, China.
The geodynamic processes that formed Earth's earliest continents are intensely debated. Particularly, the transformation from ancient crustal nuclei into mature Archaean cratons is unclear, primarily owing to the paucity of well-preserved Eoarchaean-Palaeoarchaean 'protocrust'. Here, we report a newly identified Palaeoarchaean continental fragment-the Baishanhu nucleus-in northeastern North China Craton.
View Article and Find Full Text PDFPatagonian dust, Agulhas Current, and Antarctic ice-rafted debris contributions to the South Atlantic Ocean over the past 150,000 years.
Proc Natl Acad Sci U S A
July 2024
Division of Geochemistry, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964.
Disentangling inputs of aeolian dust, ice-rafted debris (IRD), and eroded continental detritus delivered by ocean currents to marine sediments provide important insights into Earth System processes and climate. This study uses Sr-Nd-Pb isotope ratios of the continent-derived (lithogenic) fraction in deep-sea core TN057-6 from the subantarctic Southern Ocean southwest of Africa over the past 150,000 y to identify source regions and quantify their relative contributions and fluxes utilizing a mixing model set in a Bayesian framework. The data are compared with proxies from parallel core Ocean Drilling Program Site 1090 and newly presented data from potential South America aeolian dust source areas (PSAs), allowing for an integrated investigation into atmospheric, oceanic, and cryospheric dynamics.
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