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- W2371127957 abstract "It is known that marine biodetritus deposits were often carbonated to form carbonate fossils with carbonate compositions such as CaCO 3. However, an exceptional fact is provided. The marine Permian/Triassic (P/T) boundary clay, the famous white in the Meishan section, located in Changxing county, Zhejiang province of China, contributes rich pieces of gypseous broken-fossils. They appear with macro and micro morphological features under optical microscope and scanning electron microscope (SEM), with mineralogical phase of gypsum determined by powder X-ray diffraction analysis (XRD) and with chemical form of CaSO 4·2H 2O supported by measurements using energy-diffractive spectroscopy (EDS). In contrast, no carbonate fossils or biodetritus could be found from the same boundary clay at the same location. Undoubtedly, the gypseous broken-fossils were recasts and they were high likely derived from primary carbonate fossils or carbonate detritus as precursors. But, due to carbonate (such as calcite) much stable than sulfate (such as gypsum) in general, dependent on K sp(CaSO 4·2H 2O)K sp(CaCO 3) representatively, geochemical replacement of sulfate to carbonate is not permit, unless in acidic condition stronger than pH4. Following study through neutron activation analysis (NAA) confirms that there are identical mode of rare-earth elements (REE) distributions between the gypseous broken-fossils and the pure boundary clay (without any gypsum by separation), indicating both originating at least in similar marine environments and at close times. Therefore, associated with the REE mode, the finding of the gypseous broken fossils supports the proposal that a marine acidification event by hydrate sulfuric acid would occur near the time of the P/T boundary in the Earth history." @default.
- W2371127957 created "2016-06-24" @default.
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- W2371127957 date "2004-01-01" @default.
- W2371127957 modified "2023-09-25" @default.
- W2371127957 title "Recognition of Gypseous Broken-fossils in the White Clay near Permian/Triassic Boundary of the Meishan Section in South China" @default.
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