Global Geology 2010, 13(3-4) 128-134 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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tectonic setting
northern Anhui
SUN Linhua
GUI Herong and CHEN Song
Article by SUN Linhua
Article by GUI Herong and CHEN Song

Geochemistry of Neoproterozoic mixosedimentite in northern Anhui and its geological significance

SUN Linhua, GUI Herong and CHEN Song

School of Earth Sciences and Engineering,Suzhou University,Suzhou 234000,Anhui,China


Major oxides,as well as trace elements ( including rare earth elements) compositions have been analyzed for the mixosedimentites from Neoproterozoic Jiayuan Formation in northern Anhui,China. The results show that the concentrations of elements are closely related to the relative proportions of carbonates and terrigenous detritus ( varying from 2 /3 to 1 /9 based on petrographic study) . The ratios between some immobile elements ( e. g. La,Th,Zr and Sc) are constant and then can be used as tracers for the discrimination of provenance and tectonic setting of terrigenous detritus. The results indicate that the terrigenous detritus mainly came from the felsic volcanics related to continental arc,with minor contribution from the old basement. Combined with recent research progresses,these mixosedimentites imply that the Neoproterozoic sedimentation in northern Anhui was probably taken place in a back arc basin during the convergence of Rodinia super continent between 1. 0 and 0. 8 Ga.

Keywords provenance   tectonic setting   mixosedimentites   Neoproterozoic   northern Anhui  
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