Rare earth elemental and Sr isotopic evidence for seawater intrusion event of the Songliao Basin 91 million years ago

Liu, Yuke; Wang, Huajian; Zhang, Jinyou; Liu, Zhenwu; Chen, Fazi; Wang, Xiaomei; Zhang, Shuichang; Li, He

doi:10.1016/j.petsci.2022.11.015

Cited by 4 publications

(1 citation statement)

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“…The dolomite nodule was suggested to have a primary form as dolomite and a gradual transformation into ankerite as well as manganese-ankerite [21]. Rare earth elements and Sr isotope values also provide further evidence for the formation of dolomite nodules and layers resulting from the seawater intrusion events of the Songliao Basin [53,54].…”

Section: Microbial Early Diagenesis In the Ostracodsmentioning

confidence: 89%

Early Diagenesis in the Lacustrine Ostracods from the Songliao Basin 91.35 Million Years Ago and Its Geological Implications

Liu

Liu²,

Du³

et al. 2022

Minerals

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Diagenesis is a double-edged sword of geochemical recordings. It makes us always doubt about the representativeness of many geochemical indicators, especially the isotope and mineral related. It also provides a window to explore the biogeochemical processes at the water–rock interface, which are related to the interactions between the hydrosphere, biosphere, and lithosphere. In this study, we identified microbial early diagenesis in lacustrine ostracods from the Songliao Basin 91.35 million years ago by using in situ mineralogical and carbon isotope analytical methods. Our results suggest multiple biological early-diagenesis processes and the formation of a ferric and methane transition zone (FMTZ) in the sulfate-poor pore water, which are conducive to the formation of dolomite and ankerite. These secondary carbonate minerals related to dissimilatory iron reduction and methanogenesis have heavier carbon isotopic compositions than the calcified ostracod shell in the water column and might bring interferences to the geochemical parameters of ostracods.

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Section: Microbial Early Diagenesis In the Ostracodsmentioning

confidence: 89%