蓝岭地区蓝片岩和含硬柱石多硅白云母片岩变质<i>P-T</i>轨迹

王仕林; 杜瑾雪; 王根厚; 梁晓

doi:10.3799/dqkx.2018.500

Volume 43 Issue 4

Apr. 2018

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Article Navigation > Earth Science > 2018 > 43(4): 1237-1252

Wang Shilin, Du Jinxue, Wang Genhou, Liang Xiao, 2018. Metamorphic P-T Paths of Blueschist and Lawsonite-Bearing Phengite Schist in Lanling Area, Central Qiangtang. Earth Science, 43(4): 1237-1252. doi: 10.3799/dqkx.2018.500

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Wang Shilin, Du Jinxue, Wang Genhou, Liang Xiao, 2018. Metamorphic P-T Paths of Blueschist and Lawsonite-Bearing Phengite Schist in Lanling Area, Central Qiangtang. Earth Science, 43(4): 1237-1252. doi: 10.3799/dqkx.2018.500

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Metamorphic P-T Paths of Blueschist and Lawsonite-Bearing Phengite Schist in Lanling Area, Central Qiangtang

doi: 10.3799/dqkx.2018.500

School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

Received Date: 2017-07-01
Publish Date: 2018-04-15

Abstract

Abstract

The blueschist is lenticularly wrapped in the lawsonite-bearing phengite schist in Lanling area, central Qiangtang. The lawsonite included in quartz, which, on its part, is enclosed in porphyroblastic garnet in the phengite schist, is discovered for the first time. Studying on the metamorphic P-T paths of the blueschist and lawsonite-bearing phengite schist is important for the further research of the formation and evolution of the Longmu Co-Shuanghu low-temperature and high-pressure metamorphic belts. The detailed petrography and phase equilibria modeling reveal that the blueschist experienced a more obvious thermal relaxation process (the peak pressure conditions are 490℃ and 2.4 GPa, and the peak temperature conditions are 540℃, 2.1 GPa) while the lawsonite-bearing phengite schist has barely experienced a thermal relaxation process (the peak temperature and pressure conditions are 530℃ and 2.2 GPa). The similarity of the retrograde P-T paths of the blueschist and lawsonite-bearing phengite schist reveals that the exhumation of the blueschist from Lanling area, central Qiangtang, may have resulted from the exhumation of the low-density lawsonite-bearing phengite schist, which carried the denser blueschist to the earth's crust levels.
- Tibetan plateau,
- central Qiangtang,
- Lanling,
- blueschist,
- lawsonite-bearing phengite schist,
- metamorphic P-T path,
- petrology

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References(60)

References

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