桐柏山高压变质带及其区域构造型式

索书田; 钟增球; 张宏飞; 周汉文; 游振东

Volume 26 Issue 6

Jun. 2001

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Article Navigation > Earth Science > 2001 > 26(6): 551-559

SUO Shutian, ZHONG Zengqiu, ZHANG Hongfei, ZHOU Hanwen, YOU Zhendong, 2001. HIGH-PRESSURE METAMORPHIC BELT AND ITS TECTONIC PATTERN IN TONGBAI MOUNTAINS, CENTRAL CHINA. Earth Science, 26(6): 551-559.

Citation:

SUO Shutian, ZHONG Zengqiu, ZHANG Hongfei, ZHOU Hanwen, YOU Zhendong, 2001. HIGH-PRESSURE METAMORPHIC BELT AND ITS TECTONIC PATTERN IN TONGBAI MOUNTAINS, CENTRAL CHINA. Earth Science, 26(6): 551-559.

SUO Shutian, ZHONG Zengqiu, ZHANG Hongfei, ZHOU Hanwen, YOU Zhendong, 2001. HIGH-PRESSURE METAMORPHIC BELT AND ITS TECTONIC PATTERN IN TONGBAI MOUNTAINS, CENTRAL CHINA. Earth Science, 26(6): 551-559.

Citation:

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HIGH-PRESSURE METAMORPHIC BELT AND ITS TECTONIC PATTERN IN TONGBAI MOUNTAINS, CENTRAL CHINA

1.
Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2001-07-21
Publish Date: 2001-11-25

Abstract

Abstract

The Tongbai Mountains is an important component part of the Qinling-Dabieshan orogenic belt. The recent detailed researches in tectonics and petrology show that a great amount of eclogites or retrograded eclogites in different sizes, widely distributed in the Tongbai mountains, constitutes a high-pressure metamorphic belt, around 200 km long and 40 km wide. The high-pressure metamorphic unit is generally composed of the following four different major lithologies: (1) eclogites and retrograded eclogites; (2) HP-metamorphosed sedimentation and volcanic rocks; (3) gneissic or schistose rocks resulting from retrogressive HP eclogites; and (4) foliated garnet-bearing granites or garnet-free granites. The rock assemblages and metamorphic evolution of this high-pressure unit are similar to those in the Dabie-Sulu ultrahigh pressure (UHP) and high-pressure metamorphic belts. The regional structural pattern of the HP metamorphic belt in the Tongbai Mountains corresponds perfectly to a Cordilleran-type metamorphic core complex where three crustal-scale, gently-dipping, normal-sense detachment zones were developed. The composite detachment zone resulted possibly from both the lower detachment zone and the middle detachment zone is presently sandwiched between the core complex unit (CC) below, and the high-pressure metamorphic unit (HP) above. The structures controlling the present spatial distribution of HP metamorphic rocks were dominantly products of an extensional process following the Triassic HP metamorphism. Both structural considerations and concordant field relations suggest that the Tongbai HP metamorphic unit is an important part of the Dabie-Sulu UHP and HP metamorphic belts. Its western extension overlain by the Mesozoic to Cenozoic sedimentary rocks may have crossed the Nanxiang basin to the Eastern Qinling. The new findings and ideas should be employed for the reconstruction of the evolution of the whole Qinling-Dabie orogenic belt. The Tongbai high-pressure metamorphic belt serves as a structure linking the Eastern Qinling orogen with the Dabie-Sulu UHP and HP metamorphic belts.
- Tongbai mountains,
- high-pressure metamorphic belt,
- metamorphic core complex,
- extensional detachment zone,
- tectonic boundary,
- structural linkage

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References(32)

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