大兴安岭中生代两类流纹岩成因的地球化学研究

葛文春; 林强; 孙德有; 吴福元; 李献华

Volume 25 Issue 2

Mar. 2000

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Article Navigation > Earth Science > 2000 > 25(2): 172-178

GE Wenchun, LIN Qiang, SUN Deyou, WU Fuyuan, LI Xianhua, 2000. GEOCHEMICAL RESEARCH INTO ORIGINS OF TWO TYPES OF MESOZOIC RHYOLITES IN DAXING'ANLING. Earth Science, 25(2): 172-178.

Citation:

GE Wenchun, LIN Qiang, SUN Deyou, WU Fuyuan, LI Xianhua, 2000. GEOCHEMICAL RESEARCH INTO ORIGINS OF TWO TYPES OF MESOZOIC RHYOLITES IN DAXING'ANLING. Earth Science, 25(2): 172-178.

GE Wenchun, LIN Qiang, SUN Deyou, WU Fuyuan, LI Xianhua, 2000. GEOCHEMICAL RESEARCH INTO ORIGINS OF TWO TYPES OF MESOZOIC RHYOLITES IN DAXING'ANLING. Earth Science, 25(2): 172-178.

Citation:

GE Wenchun, LIN Qiang, SUN Deyou, WU Fuyuan, LI Xianhua, 2000. GEOCHEMICAL RESEARCH INTO ORIGINS OF TWO TYPES OF MESOZOIC RHYOLITES IN DAXING'ANLING. Earth Science, 25(2): 172-178.

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GEOCHEMICAL RESEARCH INTO ORIGINS OF TWO TYPES OF MESOZOIC RHYOLITES IN DAXING'ANLING

1.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
Faculty of Earth Sciences, Changchun University ofScience and Technology, Changchun 130026, China

Received Date: 1999-08-27
Publish Date: 2000-03-25

Abstract

Abstract

Widely exposed in Daxing'anling region are Late Jurassic and Early Cretaceous rhyolites that are classified as two major types in terms of petrology and trace-element geochemistry: Type-I rhyolite and Type-II rhyolite. The following conclusions can be drawn from the results in rare earth and trace elements:(1)Type-I rhyolite is characterized by the right-sloped REE distribution pattern. The incompatible elements in this type are featured by both the strong enrichment of Rb, Ba, Th, and K and the depletion of Sr, Ti, P, Nb. These features are related to the crystal differentiation of the calc-alkaline basaltic magma.(2)Type-II rhyolite is characterized by the REE and incompatible-element distribution pattern. The strong depletion of Ba and Sr in this type, a distinctive feature from Type-I rhyolite, established a bimodal volcanic association with alkaline basalts, whose origins are associated with the non-ideal melting of crustal rock. In addition, the formation of these two typesof rhyolitesis related to the extension of overlying lithosphere resulting from the upwelling of mantle-plume.
- rhyolites,
- geochemistry,
- petrogenesis,
- Daxing'anling

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References(20)

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