Petrology and mineralogy of (retrograded) eclogites from Mengku area, Shuangjiang County, western Yunnan Provinc

XU Guixiang; ZENG Wentao; SUN Zaibo; HUANG Liang; CHEN Guangyan; TIAN Sumei; ZHOU Kun

2016 Vol. 35, No. 7

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XU Guixiang, ZENG Wentao, SUN Zaibo, HUANG Liang, CHEN Guangyan, TIAN Sumei, ZHOU Kun. Petrology and mineralogy of (retrograded) eclogites from Mengku area, Shuangjiang County, western Yunnan Provinc[J]. Geological Bulletin of China, 2016, 35(7): 1035-1045.

Citation:

XU Guixiang, ZENG Wentao, SUN Zaibo, HUANG Liang, CHEN Guangyan, TIAN Sumei, ZHOU Kun. Petrology and mineralogy of (retrograded) eclogites from Mengku area, Shuangjiang County, western Yunnan Provinc[J]. Geological Bulletin of China, 2016, 35(7): 1035-1045.

Petrology and mineralogy of (retrograded) eclogites from Mengku area, Shuangjiang County, western Yunnan Provinc

Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China摘

Received Date: 12 January 2016

Revised Date: 05 May 2016

Publish Date: 15 July 2016

Abstract

Abstract

Retrograded eclogites are exposed in structural-sheet form in Naka River, Kongjiao and some other areas north of Mengku Town, Shuangjiang County of west Yunnan Province and occur in Ordovician Wanhe ophiolite mélange belt. According to different retrograde degrees, the exlogites can be divided into retrograded eclogites, garnet-amphibolite and garnet-bearing am-phibolite. The main minerals include garnet, clinopyroxene, amphibole, and plagioclase together with minor rutile, phengite, jade-ite,epidote, biotite, apatite, quartz etc. Omphacite, which is a typical HP-UHP metamorphic mineral, only exists as inclusions in a small amount of garnet and amphibole. Petrological and mineralogical characteristics show that the mineral assemblage at the meta-morphic peak is Omp+Gt+Ru+Q+Phen. Due to the growth of radial bulging cracks around some quartz inclusions in garnet, it is held that some quartz inclusions belong to retrograded coesite. The retrograded eclogite therefore must have undergone UHP meta-morphism.
- Mengku area /
- (retrograded) eclogites /
- characteristics of petrology and mineralogy /
- Shuangjiang County /
- western Yunnan Province

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References

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