塔里木南缘元古代变质基性火山岩地球化学特征——古塔里木板块中元古代裂解的证据

张传林; 赵宇; 郭坤一; 董永观; 王爱国

Volume 28 Issue 1

Jan. 2003

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Article Navigation > Earth Science > 2003 > 28(1): 47-53

ZHANG Chuan-lin, ZHAO Yu, GUO Kun-yi, DONG Yong-guan, WANG Ai-guo, 2003. Geochemistry Characteristics of the Proterozoic Meta-Basalt in Southern Tarim Plate: Evidence for the Meso-Proterozoic Breakup of Paleo-Tarim Plate. Earth Science, 28(1): 47-53.

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Geochemistry Characteristics of the Proterozoic Meta-Basalt in Southern Tarim Plate: Evidence for the Meso-Proterozoic Breakup of Paleo-Tarim Plate

1.
Institute of Geochemistry, CAS, Guiyang 550002, China
2.
Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, China

Received Date: 2002-02-05
Publish Date: 2003-01-25

Abstract

Abstract

The study of supercontinent-breakup is a modern frontier project of earth science. Based on the lithochemistry, the trace element, REE and Sm-Nd isotope characteristics of the Precambrian metamorphic volcanic rocks of Tiekelike belt in Southern Tarim plate, this paper studies the tectonic events for the Meso-Proterozoic breakup of paleo-Tarim plate. The meta-volcanic rocks were composed of meta-rhyolite (the lower part) and meta-basalt interspersed by thin-layered marble (the upper part). The basalt has low w(SiO₂) arranging from 43.8% to 49.26% and averaging 47.29%, it has high alkaline and w(Na₂O+K₂O) is between 2.6% and 4.9%. The lower basalt has w(Na₂O)/w(K₂O) arranging from 0.54 to 1.50 and belongs to shoshinite which has high ∑REE and LREE, its w(La)_n/w(Yb)_n averages 3.45 and δ(Eu) is between 0.69 and 0.91 which shows middle negative anomality. The upper basalt has w(Na₂O)/w(K₂O) arranging from 5.11 to 17.89 and belongs to tholeiite, it has low ∑REE, δ (Eu) is between 0.82 and 1.13, its REE spider pattern (normalized by C1 chondrite) is similar with that of the oceanic tholeiite, its trace elements shows characteristics of oceanic tholeiite and the lower basalt is similar with that of intro-plate basalt. Sm-Nd isochron of the upper basalt is (1 200±82.3) Ma. Concluded on above studies, we put forward that the Precambrian metamorphic volcanic rocks recorded the whole breakup tectonic course in Meso-Proterozoic of the southern paleo-Tarim plate.
- southern Tarim,
- Precambrian volcanic rock,
- geochemistry

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References(20)

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