Diabase evidence for the early Mesozoic extension in the western Tarim basin, NW China
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    Abstract:

    Abstract:Diabase dikes exposed on the northwestern margin of the Tarim basin contain 44.34%-49.3% SiO2 have higher values of Na2O+K2O (4.32%–6.04%) and Na2O/K2O (2.23-9.15), showing the features of intraplate basalt. The diabase is also characterized by a lower total REE content (∑REE=35.71-47.95 μg/g) and a higher ratio of (La/Yb)N (11.66-14.77) and no pronounced Eu anomaly. The geochemistry of the diabase suggests that it was derived from enriched mantle sources. 40Ar/39Ar dating of the diabase yields ages of 235.6 and 203.7 Ma. The above-mentioned geochemical characteristics combined with an integrated analysis of the Triassic-Jurassic sedimentary and tectonic settings of the western Tarim basin, especially the Tajikistan basin and Karakumy basin west of the Tarim basin suggest that:in the Triassic-Jurassic the western Tarim basin was in a prelude stage of Cretaceous-Paleogene intense subsidence and its main part was still in an uplift stage against the general extensional setting.

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LUO Jin-hai, CHE Zi-cheng, ZHOU Xin-yuan, LI Yong, LI Jian-li, ZHANG Jing-yi. Diabase evidence for the early Mesozoic extension in the western Tarim basin, NW China[J]. Geology in China, 2006, 33(3): 566-571(in Chinese with English abstract).

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  • Online: April 10,2013
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