云南兰坪盆地古近系细碎屑岩地球化学特征及其地质意义

doi:10.13278/j.cnki.jjuese.201506107

摘要/Abstract

摘要：

采用电感耦合等离子体质谱(ICP-MS)方法对兰坪盆地古近系104件细碎屑岩样品进行了稀土元素及微量元素分析,结果显示∑LEE含量较高,轻稀土含量较富集、重稀土含量较亏损,显示出明显的"右倾"型配分模式。根据稀土元素和微量元素特征、w(Zr)-w(Th)、La-Th-Sc、Th-Sc-Zr/10等多种沉积构造背景判别图解及多种交叉分析方法,对兰坪盆地古近系细碎屑源岩构造背景进行了详细研究。利用La/Th-Hf和La/Yb-∑REE判别图解对兰坪盆地古近系源岩属性进行了分析,结果表明:兰坪盆地古近系碎屑源岩主要以上地壳长英质岩石为主,并混有少量基性岩,反映其物源区构造背景为早期为大陆岛弧构造背景,至晚期逐渐过渡为被动大陆边缘构造背景。

关键词: 地球化学, 古近系, 碎屑岩, 兰坪盆地

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

中图分类号:

P595

朱志军, 郭福生, 刘腾, 刘远超. 云南兰坪盆地古近系细碎屑岩地球化学特征及其地质意义[J]. 吉林大学学报(地球科学版), 2015, 45(6): 1631-1641.

Zhu Zhijun, Guo Fusheng, Liu Teng, Liu Yuanchao. Geochemical Characteristics of Paleogene Fine Clastic Rock and Its Geological Significance in Lanping Basin, Yunnan[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(6): 1631-1641.

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