Spatial and Temporal Characteristics of Permian Large Igneous Province in Tarim Basin

Abstract

Abstract: The magmatism of Permian large igneous province (LIP) is a very significant thermotectonic event in process of evolution of Tarim basin. The lithological units of this province consist of brecciated mica-olivine pyroxenite pipe, olivine pyroxenite, pyroxenite, gabbro, basalt, diabase, alkali syenite and syenite dike, being dominated by basalt and diabase. They are not only distributed in the west part of Manjiaer depression and west part of Tabei (northern Tarim) uplift, but also in Tazhong (central Tarim) uplift, Buchu uplift and Taxinan (southwestern Tarim) depression, covering an area of 20×10⁴ km 2 , and there are also 7 thickness centers for residual distribution. The time sequence of the Permian LIP development is as follows: Wajilitag layered rock mass→brecciated mica-olivine pyroxenite pipe→ basalt of Kupukuciman formation (278-292 Ma) →basalt of Kaipaicileike formation (272-288 Ma) →diabase and ultrabasic dikes→ syenite (quartz syenite porphyry) (277 Ma).

Key words: Tarim basin, Permian, LIP, distribution, time sequence

CLC Number:

TE111.3

CHEN Han-lin, YANG Shu-feng, LI Zi-long, YU Xing, LUO Jun-cheng, HE Guang-yu, LIN Xiu-bin, WANG Qing-hua. Spatial and Temporal Characteristics of Permian Large Igneous Province in Tarim Basin[J]. Xinjiang Petroleum Geology, 2009, 30(2): 179-182.

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