Reconstruction of protoliths of metamorphic rocks of the Tuolai Group and its tectonic setting

WANG Long; YU Feng; LIU Zhixian; XU Xiaofei; JIA Yuyang

2016 Vol. 35, No. 9

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WANG Long, YU Feng, LIU Zhixian, XU Xiaofei, JIA Yuyang. Reconstruction of protoliths of metamorphic rocks of the Tuolai Group and its tectonic setting[J]. Geological Bulletin of China, 2016, 35(9): 1448-1455.

Citation:

WANG Long, YU Feng, LIU Zhixian, XU Xiaofei, JIA Yuyang. Reconstruction of protoliths of metamorphic rocks of the Tuolai Group and its tectonic setting[J]. Geological Bulletin of China, 2016, 35(9): 1448-1455.

Reconstruction of protoliths of metamorphic rocks of the Tuolai Group and its tectonic setting

Academy of Regional Geological Survey and Mineral Resources Exploration of Shaanxi, Xianyang 712000, Shaanxi, China

Received Date: 31 December 2015

Revised Date: 26 April 2016

Publish Date: 15 September 2016

Abstract

Abstract

A study of the nature of the protoliths of metamorphic rocks in the Tuolai Group and their tectonic setting shows that the schist, gneiss, quartzite and marble in metamorphic rocks of the Tuolai Group are originally sedimentary rocks, and the amphibolite in metamorphic rocks of the Tuolai Group is basic volcanic rock. The protolith of schist and gneiss is greywacke, the quartzite is quartz sandstone, the marble is dolostone and limestone, and the amphibolite is basaltic andesite. Discrimination of the tectonic setting of meta-volcanic rock indicates that the amphibolite formed in an intracontinental rift environment. As the special interlayer of Tuolai Group, the metasedimentary rocks should have the same tectonic environment as the anphibolite, both formed in an extensional basin.
- Mid-Qilian massif /
- Tuolai Group /
- protoliths reconstruction /
- tectonic setting

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References

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