Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (6): 1631-1641.doi: 10.13278/j.cnki.jjuese.201506107

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Geochemical Characteristics of Paleogene Fine Clastic Rock and Its Geological Significance in Lanping Basin, Yunnan

Zhu Zhijun1,2, Guo Fusheng1,2, Liu Teng1, Liu Yuanchao1   

  1. 1. State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China Institute of Technology, Nanchang 330013, China;
    2. College of Geosciences, East China Institute of Technology, Nanchang 330013, China
  • Received:2015-03-30 Published:2015-11-26

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Abstract:

The rare earth elements (REE) and trace elements are analyzed by ICP-MS for the 104 pieces of Paleogene fine clastic rock samples from Lanping basin, Yunnan Province. ∑REE is relatively high;and the differentiation is significant between LREE and HREE.LREE is abundant; while HREE is depleted. LREE is heeling rightward obviously; while HREE is even, with Eu and Ce negative anomaly. The tectonic background of Paleogene fine clastic rock in Lanping basin is studied in detail through an analysis on the geochemical characteristics of REEs and trace elements, sedimentary tectonic setting discrimination diagrams with w(Zr)-w(Th), La-Th-Sc, Th-Sc-Zr/10, and a variety of crossover methods. The property of source rock is also analyzed by La/Th-Hf and La/Yb-∑REE discrimination diagrams. The results show that the Paleogene clastic source rocks in Lanping basin are mainly felsic rocks derived from the upper crust, and mixed with a small amount of andesitic source. These results show that the source rocks formed tectonically in an environment of early continental arc which transferred later to a passive continental margin.

Key words: geochemistry, Paleogene, clastic rock, Lanping basin

CLC Number: 

  • P595

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