Geochemical characteristics and geological significance of the Neoproterozoic carbonates from northern Anhui Province,China |
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| Authors: | Linhua Sun Herong Gui Song Chen Yanping Ma Zhenyu He |
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| Institution: | (1) Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, China; |
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| Abstract: | Petrographical and geochemical studies were carried out of the Neoproterozoic carbonates from northern Anhui Province, China.
These carbonates can be subdivided into two types, including purified limestone (PL) and mixed limestone and siliclastic rocks
(MLS). PLs are low in Si, Al, Zr and total REE but high in CaO compared with MLSs. Correlations between Zr, Fe2O3, P2O5 and total REE are also less remarkable, indicating that they were not obviously contaminated by continental materials but
directly precipitated from seawater. So they can be used for the inversion of paleo-seawater REE patterns. The inversed results
indicated that the REE pattern of Neoproterozoic seawater was similar to that of the modern seawater except for the lack of
Ce depletion, which was probably affected by the reduced hydrothermal solution. In combination with previous studies, the
geochemical trending of these carbonatic samples towards the continental arc in the La-Th-Sc and Th-Sc-Zr/10 diagrams is interpreted
as the contamination of arc volcanism. The tectonic background of the southern margin of the North China Craton in the Neoproterozoic
was probably related to the Grenville orogeny during the convergence of the Rodinia supercontinent, rather than an intra-plate
environment. |
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| Keywords: | geochemistry carbonate Neoproterozoic geological significance Anhui Province |
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