Abiotic Methane Inclusions in Olivine from the Yushigou Peridotite and Their Forming Conditions

doi:10.13209/j.0479-8023.2022.013

Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2022, Vol. 58 ›› Issue (2): 241-248.DOI: 10.13209/j.0479-8023.2022.013

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Abiotic Methane Inclusions in Olivine from the Yushigou Peridotite and Their Forming Conditions

LIN Chiumei, SONG Shuguang^†, CUI Ying

Key Laboratory of Orogenic Belts and Crustal Evolution (MOE), School of Earth and Space Sciences, Peking University, Beijing 100871

Received:2021-03-12 Revised:2021-04-17 Online:2022-03-20 Published:2022-03-20
Contact: SONG Shuguang, E-mail: sgsong(at)pku.edu.cn

祁连山玉石沟橄榄岩中非生物成因甲烷‒石墨流体包裹体及其形成条件

林秋玫, 宋述光^†, 崔莹

造山带和地壳演化教育部重点实验室, 北京大学地球与空间科学学院, 北京 100871

通讯作者: 宋述光, E-mail: sgsong(at)pku.edu.cn
基金资助:
国家重点研发计划(2019YFA0708501)和国家自然科学基金(91955202)资助

Abstract

Abstract:

The paper presents studies of the methane-rich fluid inclusions in the fresh peridotite from the Cambrian Yushigou ophiolite, the middle part of North Qilian Orogenic Belt. In situ analysis of laser Raman spectroscopy shows that these fluid inclusions are mainly composed of liquid or gaseous CH₄+C (graphite) with minor components of N₂, H₂O, C₂H₆ and C₃H₈, representing the reductive C-H fluid speciation. Based on characteristic bands of graphite, the authors carry out fluid temperature estimates using the RSCM (Raman spectroscopy of carbonaceous materials). The calculated temperatures range from 430 to 590°C, which represents the minimum temperature for precipitation of graphite and indicates that CH₄+C is abiotic origin and formed in the mantle environment.

Key words: methane, graphite, fluid inclusions, Raman spectroscopy, Yushigou peridotite

摘要：

研究北祁连造山带玉石沟橄榄岩中富甲烷流体包裹体。激光拉曼光谱原位分析结果显示, 这些流体包裹体主要由液态或气态 CH₄+C(石墨)组成, 次要成分为N₂, H₂O, C₂H₆和C₃H₈, 代表还原性的C-H流体形式。根据石墨的拉曼特征谱峰, 利用石墨化碳质拉曼光谱(RSCM)温度计计算石墨形成温度, 结果指示石墨在流体中沉淀的最低温度介于430~590°C之间, 表明CH₄+C是非生物成因的, 并形成于地幔环境。

关键词: 甲烷, 石墨, 流体包裹体, 拉曼光谱, 玉石沟橄榄岩

LIN Chiumei, SONG Shuguang, CUI Ying. Abiotic Methane Inclusions in Olivine from the Yushigou Peridotite and Their Forming Conditions[J]. Acta Scientiarum Naturalium Universitatis Pekinensis, 2022, 58(2): 241-248.

林秋玫, 宋述光, 崔莹 . 祁连山玉石沟橄榄岩中非生物成因甲烷‒石墨流体包裹体及其形成条件[J]. 北京大学学报自然科学版, 2022, 58(2): 241-248.

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Abiotic Methane Inclusions in Olivine from the Yushigou Peridotite and Their Forming Conditions

祁连山玉石沟橄榄岩中非生物成因甲烷‒石墨流体包裹体及其形成条件

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