Abiotic Methane Reservoirs in the Western Tianshan HP–UHP Metamorphic Belt,China  

作　　者：ZHANG Lijuan ZHANG Lifei LI Xiaowei WANG Xiao 

机构地区：[1]Key Laboratory of Orogenic Belts and Crustal Evolution,MOE,School of Earth and Space Sciences,Peking University,Beijing 100871,China [2]State Key Laboratory of Geological Processes and Mineral Resources,School of Earth Sciences and Mineral Resources,China University of Geosciences,Beijing 100083,China

出　　处：《Acta Geologica Sinica(English Edition)》2023年第1期337-349,共13页地质学报（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(Grant No.2019YFA0708501);the National Natural Science Foundation of China(Grant No.42172060)。

摘　　要：Natural gas,consisting primarily of methane(CH_(4)),has become a major source of clean energy in modern society in many parts of the globe.Recent experimental observations and discoveries of deep-sourced abiotic CH_(4)in cold subduction zones indicate the important ability of cold subducted slabs to generate natural gas reservoirs.However,most CH_(4)flux and reservoirs remain unknown and their potential is overlooked in global carbon flux estimations.Massive abiotic CH_(4)-rich fluid inclusions(FIs)in garnet and omphacite from ultrahigh-pressure(UHP)eclogites have been found in the Western Tianshan(WT)UHP metamorphic belt,which provides one ideal case for quantification of abiotic CH_(4)stored in the cold subducted crust.By two methods,we assess the abiotic CH_(4)content stored in the Chinese WT HP–UHP metamorphic belt.Our calculations show that at least 113 Mt CH_(4)is stored in the WT eclogites.We also discuss the implications for CH_(4)reservoirs in subduction zones worldwide and speculate that the cold subduction zones may represent one of the largest,yet overlooked,sources of abiotic CH_(4)on Earth,which should not be ignored in the global natural resource and carbon flux estimations.

关 键 词：energy resources abiotic CH_(4)reservoirs fluid inclusions carbon flux cold subduction zone ECLOGITE Tianshan Mts 

分 类 号：P618.13[天文地球—矿床学]