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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2018.1
- 수록면
- 287 - 301 (15page)
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This paper documents the geochemistry of clastic sedimentary rocks from the Upper Carboniferous Zongwulong Group in the Zongwulong structural belt of the Qaidam Basin, NW China, in order to trace the sources of the sediments and to understand their tectonic settings at the time of deposition of the Zongwulong Group. Although the major elements differ among different samples, their low mean chemical index of alteration mean CIA = 51.04–64.79), plagioclase index of alteration (mean PIA = 51.41–69.54), and relatively high mean index of compositional variability (mean ICV = 1.18–1.56) indicate relatively low maturity and weak to moderate chemical weathering of their source. The Zr/Sc-Th/Sc diagram and relatively high mean ICV suggest that all sediments of Zongwulong Group have undergone no significant sediment recycling. All samples yield relatively high Al2O3/TiO2 ratios (16–27), strong LREE/HREE differentiation (mean LaN/YbN = 10.83–12.66), and obvious negative Eu anomalies (mean Eu/Eu* = 0.61–0.79). Combined with characteristic ratios (La/Sc, Th/Sc, Cr/Th, and Th/Co) and the provenance discriminant diagrams (Al2O3-(CaO* + Na2O)-K2O and Ni-TiO2), these results indicate felsic source rocks. Combined with the findings of previous studies, the representative values (La, Ce, ΣREE, V, Rb/Sr, Eu/Eu*, La/Sc, Th/Sc, and Zr/Th) and tectonic setting discriminants (SiO2-K2O/Na2O, Fe2O3 + MgO-Al2O3/SiO2, La/Sc-Ti/Zr, and Th-Sc-Zr/10) indicate that the Zongwulong Group sediments were deposited in a back-arc extensional basin behind the active continental margin-continental island arc tectonic setting.
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참고문헌 (66)
참고문헌 신청
Amstrong-Altrin, J.S. / 2004 / Geochemistry of sandstones from the Upper Miocene Kudankulam Formation, southern India: implications for provenance, weathering, and tectonic setting / Journal of Sedimentary Research 74:285~297
Bhatia, M.R. / 1983 / Plate tectonics and geochemical composition of sandstones / Journal of Geology 91:611~627
Bhatia, M.R. / 1985 / Rare-earth element geochemistry of Australian Paleozoic graywackes and mudrocks: provenance and tectonic control / Sedimentary Geology 45:97~113
Bhatia, M.R. / 1986 / Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins / Contributions to Mineralogy and Petrology 92:181~193
Condie, K.C. / 1993 / Chemical composition and evolution of the upper continental crust: contrasting results from surface samples and shales / Chemical Geology 104:1~37
Bhatia, M.R. / 1983 / Plate tectonics and geochemical composition of sandstones / Journal of Geology 91:611~627
Bhatia, M.R. / 1985 / Rare-earth element geochemistry of Australian Paleozoic graywackes and mudrocks: provenance and tectonic control / Sedimentary Geology 45:97~113
Bhatia, M.R. / 1986 / Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins / Contributions to Mineralogy and Petrology 92:181~193
Condie, K.C. / 1993 / Chemical composition and evolution of the upper continental crust: contrasting results from surface samples and shales / Chemical Geology 104:1~37
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