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Sedimentary geochemistry and provenance of the Lower and Middle Devonian Laojunshan Formation,the North Qilian Orogenic Belt |
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| Authors: | XU YaJun DU YuanSheng YANG JiangHai & HUANG Hu Key Laboratory of Biogeology Environmental Geology of China Education Ministry China University of Geosciences Wuhan China State Key Laboratory of Geological Processes Mineral Resources |
| Affiliation: | XU YaJun2,DU YuanSheng1,2,YANG JiangHai2 & HUANG Hu2 1 Key Laboratory of Biogeology , Environmental Geology of China Education Ministry,China University of Geosciences,Wuhan 430074,China,2 State Key Laboratory of Geological Processes , Mineral Resources |
| Abstract: | The Laojunshan Formation is a suite of molasse formed during the rapid uplift of the North Qilian Orogenic Belt (NQOB). Forty-one samples of sandstone have been collected from the Sunan and Minle sections in the western sector and the Gulang and Jingyuan sections in the eastern sector of the NQOB belt. Geochemical analyses of those samples indicated: 1) The MgO+Fe2O3T and Al2O3/SiO2 values are higher, and K2O/Na2O ratios are lower in the western sector than those in the eastern sector. 2) All of them are de... |
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