长江源区新生代火山岩的系列及成因

魏君奇; 王建雄; 牛志军

Volume 29 Issue 1

Jan. 2004

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WEI Jun-qi, WANG Jian-xiong, NIU Zhi-jun, 2004. Series of the Cenozoic Rocks in Source Region of the Yangtze River and Their Genesis. Earth Science, 29(1): 25-30.

Citation:

WEI Jun-qi, WANG Jian-xiong, NIU Zhi-jun, 2004. Series of the Cenozoic Rocks in Source Region of the Yangtze River and Their Genesis. Earth Science, 29(1): 25-30.

WEI Jun-qi, WANG Jian-xiong, NIU Zhi-jun, 2004. Series of the Cenozoic Rocks in Source Region of the Yangtze River and Their Genesis. Earth Science, 29(1): 25-30.

Citation:

WEI Jun-qi, WANG Jian-xiong, NIU Zhi-jun, 2004. Series of the Cenozoic Rocks in Source Region of the Yangtze River and Their Genesis. Earth Science, 29(1): 25-30.

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Series of the Cenozoic Rocks in Source Region of the Yangtze River and Their Genesis

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Yichang Institute of Geology and Mineral Resources, Yichang 443003, China

Received Date: 2003-04-27
Publish Date: 2004-01-25

Abstract

Abstract

The rock series of the Cenozoic volcanic rocks include high-K calc-alkaline (HK-CA) series and shoshonite (SHO) series in the source region of the Yangtze River. The HK-CA rocks were formed in Eocene and the SHO rocks were formed in Neogene. Generally speaking, rocks with high content of alkali and K₂O are enriched in LILE and with high abundance of REE, high ratio of LREE/HREE. The HK-CA rocks have more SiO₂, Al₂O₃ and less K₂O, TiO₂, P₂O₅, MgO, FeO, ∑REE, HFSE, I_Sr than SHO, and show no Eu negative anomalies, distinguishing from SHO that show light Eu negative anomalies. Therefore, the HK-CA series belong to crust-derived magma series and are originated from melting of an eclogitic lower crust; the SHO series belong to mantle-derived magma series and are originated from melting of (EMⅡ) mantle. The Cenozoic volcanic rocks were formed in back-collision tectonic environment, and both HK-CA and SHO series magmas should be generated at the late stage of collision process, that is, when the collision changed from compression then to strike-slip movement, the SHO rocks occurred following HK-CA rocks.
- high-K calc-alkaline series,
- shoshonite series,
- Cenozoic volcanic rock,
- source region of the Yangtze River

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References(16)

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