传统温压计在低温榴辉岩应用中的局限:以西南天山超高压变质带为例

张丽娟; 张立飞; 初旭

doi:10.3799/dqkx.2018.010

Volume 43 Issue 1

Jan. 2018

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Zhang Lijuan, Zhang Lifei, Chu Xu, 2018. Limitations of Traditional Thermobarometer in Applications to Low-Temperature Eclogites: A Case Study of UHP Metamorphic Belt in Southwest Tianshan. Earth Science, 43(1): 164-175. doi: 10.3799/dqkx.2018.010

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Zhang Lijuan, Zhang Lifei, Chu Xu, 2018. Limitations of Traditional Thermobarometer in Applications to Low-Temperature Eclogites: A Case Study of UHP Metamorphic Belt in Southwest Tianshan. Earth Science, 43(1): 164-175. doi: 10.3799/dqkx.2018.010

Citation:

Zhang Lijuan, Zhang Lifei, Chu Xu, 2018. Limitations of Traditional Thermobarometer in Applications to Low-Temperature Eclogites: A Case Study of UHP Metamorphic Belt in Southwest Tianshan. Earth Science, 43(1): 164-175. doi: 10.3799/dqkx.2018.010

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Limitations of Traditional Thermobarometer in Applications to Low-Temperature Eclogites: A Case Study of UHP Metamorphic Belt in Southwest Tianshan

doi: 10.3799/dqkx.2018.010

The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education; School of Earth and Space Sciences, Peking University, Beijing 100871, China

Received Date: 2017-10-12
Publish Date: 2018-01-15

Abstract

Abstract

The temperature and pressure of eclogite facies metamorphic rocks are very important to understand the formation and evolution of HP-UHP metamorphic belt. However, the pressures calculated by the traditional thermobarometer that involves omphacite are generally lower than those of the phase equilibrium modeling, for eclogites from the UHP metamorphic belt of the Southwest Tianshan. Petrographic and mineral chemical analyses on omphacite in eclogites and HP veins are conducted, inspired by the study of Zhang et al.(2017). The results show that the omphacite is typically zoned. From core to rim, Fe³⁺ content continuously decreases, and Al content increases in response; the decrease in Fe³⁺/Al ratio corresponds to a general decline in the aegirine content and increase in the jadeite content. Phase equilibrium modeling shows that the omphacite rim with the highest jadeite content grew during decompression after the pressure peak. Thus, the maximum in jadeite component does not necessarily represents peak pressure, and the conventional thermobarometers should be used with caution, especially for the low-temperature assemblages with complicated zonation patterns.
- traditional thermobarometer,
- pseudosection,
- omphacite,
- low-temperature eclogites,
- Southwest Tianshan,
- petrology

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References(55)

References

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Limitations of Traditional Thermobarometer in Applications to Low-Temperature Eclogites: A Case Study of UHP Metamorphic Belt in Southwest Tianshan

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