Geochemistry and provenance of the early cretaceous lacustrine clastic sedimentary rocks of Yixian Formation from the Sihetun section, West Liaoning

被引：4
作者：
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China [1 ]
不详 [2 ]
不详 [3 ]
机构：
[1] Faculty of Earth Sciences, China University of Geosciences
[2] State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences
[3] Institute of Geology and Geophysics, Chinese Academy of Sciences
来源：
Diqiu Kexue Zhongguo Dizhi Daxue Xuebao | 2008年 / 4卷 / 504-514期
关键词：
Mesozoic; Sedimentary rock; Sihetun; Trace element composition;
D O I：
10.3799/dqkx.2008.064
中图分类号：
学科分类号：
摘要：
A wide range of well preserved Jehol biota fossils have been found in the sedimentary rocks of the Yixian Formation from the Sihetun area in West Liaoning Province. We have analyzed major and trace element compositions of fifty samples of clastic sedimentary rocks from this section. Combined with data previously publicized by others, the conclusions are as follows: Firstly, this set of sedimentary rocks share similar chemical characteristics to the associated volcanic rocks, with LREE enrichment, flat HREE, high Mg#, high contents of large ion lithophile element (LILE) and variable REE anomalies. Their spider diagrams show significant negative Nb and positive Pb anomalies. It is deducted that the sedimentary rocks were mainly derived from the high Mg# volcanic rocks from the Yixian Formation. Secondly, these sedimentary rocks show variable Eu anomalies (Eu/Eu* = 0.48-1.81) with the average value being 0.75. The positive anomaly is due to presence of plagioclase. Moreover, tectonic discrimination diagram of Th-Co-Zr/10 suggests that these sedimentary rocks were formed in a tectonic setting similar to the continental island arc and active continental margin.
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页码：504 / 514
页数：10
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