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Geochemical Characters and Tectonic Significance of Amphibolite of Baxkorgan Group in Western Segment of Altun Mountains(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2007年第03期
Page:
227-233
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Geochemical Characters and Tectonic Significance of Amphibolite of Baxkorgan Group in Western Segment of Altun Mountains
Author(s):
Q IN Xiao-feng1; 2; XIA Bin1; LI Jiang2; LU Ji-pu2;  XU Hua2; ZHO U Fu-sheng2; HU Gui-ang 2; LI Qian2
1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China; 2. Guangxi Institute of Regional Geological Survey, Guilin 541003, Guangxi, China
Keywords:
amphibolite;  Baxkoran group;  geochemistry;  western segment of Altun mountains
PACS:
P588.14;P595
DOI:
-
Abstract:
Amphibolites of Bashenkuergan Group of Changchengian System mainly distribute in the northern margin of the western segment of Altun tectonic belt. They occur in mica-quratz schist, granulitite,quartzite, biotite-feldspathic gneiss,marble and so on in the layer-like and lense-like shapes. On the basis of detailed researches on petrology, petrochemistry and geochemistry of REE and trace elements, the protolith of amphibolites are neutral-basic volcanic rocks, and two types of amphibolites have been recognized from Bashenkuergan Group in the western segment of Altun mountains. The protolith of type 1 rocks is characterized by the light REE enriched pattern with(La/Yb)Nbeing 3. 04～ 5. 68 andδ(Eu)0. 79～ 0. 93. This may indicate that amphibolites are similar to continental(intraplate) rift basalt. The protolith of type 2 rocks is basalt which might have been formed in the mid-ocean ridge. The amphibolites have the flat REE pattern similar to that of E- type MORB with(La/Yb)Nbeing 1. 87～ 1. 96 andδ(Eu)0. 89～ 0. 91. Thus, it is considered that the northern margin of the western segment of Altun tectonic belt was mainly in the tectonic setting of continental(intraplate) rift during the Changchengian Period and a primary ocean basin was formed locally in company with the further spreading of continental rift.

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Last Update: 1900-01-01