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Evolution of groundwater system in the Pearl River Delta and its adjacent shelf since the late Pleistocene.
Sci Adv
April 2024
Beijing International Center for Gas Hydrate, School of Earth and Space Sciences, Peking University, Beijing, China.
Our extensive field studies demonstrate that saline groundwater inland and freshened groundwater offshore coexist in the same aquifer system in the Pearl River delta and its adjacent shelf. This counterintuitive phenomenon challenges the commonly held assumption that onshore groundwater is typically fresh, while offshore groundwater is saline. To address this knowledge gap, we conduct a series of sophisticated paleo-hydrogeological models to explore the formation mechanism and evolution process of the groundwater system in the inland-shelf systems.
View Article and Find Full Text PDFGeochemical Analysis of Dolomite in the Fourth Member of the Upper Sinian Dengying Formation, Northern Sichuan Basin, China.
ACS Omega
December 2023
School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China.
The fourth member of the Sinian Dengying Formation in northern Sichuan was reformed by multistage diagenetic fluids. It is beneficial to systematically analyze the diagenetic evolution of the area to clarify the sedimentary evolution of the dolomite in the fourth member of the Dengying Formation and the fluid characteristics at different diagenetic stages. In this study, the petrological characteristics, vertical sedimentary evolution, diagenetic fluid stages, and diagenetic environment of Dengsi dolomite were analyzed by using carbon-oxygen strontium isotopes, rare-earth elements, major and trace elements, combined with the supporting thin section identification and cathodoluminescence techniques, and the source and properties of diagenetic fluid of Dengsi dolomite in different diagenetic environments were determined.
View Article and Find Full Text PDFIce and ocean constraints on early human migrations into North America along the Pacific coast.
Proc Natl Acad Sci U S A
February 2023
University of Oregon, Eugene, OR 97403.
Founding populations of the first Americans likely occupied parts of Beringia during the Last Glacial Maximum (LGM). The timing, pathways, and modes of their southward transit remain unknown, but blockage of the interior route by North American ice sheets between ~26 and 14 cal kyr BP (ka) favors a coastal route during this period. Using models and paleoceanographic data from the North Pacific, we identify climatically favorable intervals when humans could have plausibly traversed the Cordilleran coastal corridor during the terminal Pleistocene.
View Article and Find Full Text PDFDecoding geobiological evolution from microbiomes.
Sci Adv
February 2023
Mantle Drilling Promotion Office, Institute for Marine-Earth Exploration and Engineering (MarE3), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama 236-0001, Japan.
Genomic records of genetic recombination and mutation rates indicate that freshwater ammonia-oxidizing archaea have evolved through paleoclimate and geohydrological history.
View Article and Find Full Text PDFClimate transition at the Eocene-Oligocene influenced by bathymetric changes to the Atlantic-Arctic oceanic gateways.
Proc Natl Acad Sci U S A
April 2022
Centre for Earth Evolution and Dynamics, Department of Geosciences, University of Oslo, Oslo, 0371 Norway.
The Eocene–Oligocene Transition (∼33.9 Ma) marks the largest step transformation within the Cenozoic cooling trend and is characterized by a sudden growth of the Antarctic ice sheets, cooling of the interior ocean, and the establishment of strong meridional temperature gradients. Here we examine the climatic impact of oceanic gateway changes at the Eocene–Oligocene Transition by implementing detailed paleogeographic reconstructions with realistic paleobathymetric models for the Atlantic–Arctic basins in a state-of-the-art earth system model (the Norwegian Earth System Model [NorESM-F]).
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