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Xu J.,Jilin University | Liu Z.,Jilin University | Liu Z.,Key Laboratory of Oil Shale and Symbiosis Energy Minerals of Jilin Provence | Liu Z.,Key Laboratory for Evolution of Past Life and Environment in Northeast Asia | And 11 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2015

The Dunhua Basin is located in the middle of Dun Mi fracture belts, and the Neogene mainly develops the Tumenzi Formation. Systematic sampling was made and sandstone of the Tumenzi Formation in the Dunhua Basin was analyzed. The results show that the rare earth elements of sandstone possess characteristics as follows: light rare earth elements enrichment (w(LREE) is 51.00-278.31 μg/g), height rare elements flat (w(HREE) is 14.27-79.38 μg/g) and more obviously negative europium anomalies (average w(δEu) is 0.84). However, the race elements have no remarkable homogenization. All indicate that the source rocks of sandstone were carried and accumulated in short distance which mainly came from felsic rocks of the upper crust without experiencing deposition and recycling. Through the judgment combined with the geochemical characteristic, Dincksion diagram of sandstone and the study of regional geology, sandstone of the Tumenzi Formation has several provenances, and source region majorly was formed in the recycled orogeny and basement uplifted provenances under the tectonic background of active continental margin at the end of the indo-china movement. Source rocks mostly came from felsic volcanic rocks and intrusive rocks during the late Triassic to early-middle Jurassic, with a little probably from metamorphic of the Late Permian and sedimentary rocks of the residual Cretaceous and Paleogene. ©, 2015, Central South University of Technology. All right reserved. Source

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