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  4. 岩石圈演化国家重点实验室
Multiple Episodes of Fluid Infiltration Along a Single Metasomatic Channel in Metacarbonates (Mogok Metamorphic Belt, Myanmar) and Implications for CO2 Release in Orogenic Belts

文献类型：期刊论文

作者Guo, Shun2,3; Chu, Xu5; Hermann, Joerg1; Chen, Yi2,3; Li, Qiuli2; Wu, Fuyuan2; Liu, Chuanzhou2,3; Sein, Kyaing4
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2021
卷号126期号:1页码:23
关键词Baddeleyite fluid‐ mineral equilibria metamorphic CO2 release multiple fluid infiltration orogenic belt reaction zone
ISSN号2169-9313
DOI10.1029/2020JB020988
英文摘要Fluid infiltration into metacarbonates is a key mechanism to induce orogenic decarbonation, which influences the global carbon cycle and long-term climate evolution. Little is known regarding the fluid pathways during episodic infiltration events and how flow patterns control time-integrated CO2 outflux. We investigate the "vein-like" polycrystalline mineral reaction zones (PMRZs) in dolomite marbles (Mogok metamorphic belt, Myanmar), which are formed by metasomatism via the infiltration of Si-Al-K-Ti-Zr-bearing fluids. The petrographic textures and mineral U-Pb chronology reveal three episodes of fluid influx in a single PMRZ: (1) the initial episode (Stage-I) transformed most dolomite into Mg-rich silicates/oxides and calcite at similar to 35-36 Ma indicated by baddeleyite cores; (2) baddeleyite rims gave ages of similar to 23-24 Ma, representing a subsequent infiltration episode (Stage-II) that modified Stage-I minerals via a dissolution-precipitation mechanism; (3) the final episode (Stage-III) is recorded by zircon replacing baddeleyite, which yielded ages of similar to 17 Ma. Stage-III fluid has a higher SiO2 activity and XCO2 [CO2/(CO2 + H2O)] than Stage-I/Stage-II fluids. Thermodynamic and mass-balance analyses indicate that Stage-I infiltration causes >62-67% loss of CO2 by both dolomite-consuming reactions and calcite dissolution, whereas the latter two infiltration episodes induce <12-18% loss of CO2 via calcite dissolution. Our results provide compelling evidence that repeated episodes of infiltration (each separated in time by 7-13 Ma) occurred along a single channel in marbles. The initial infiltration episode may create high-permeability regions, offering favorable channels for later-stage fluids that transfer obviously less CO2 than the initial metasomatism. This considerably complicates a quantitative assessment of CO2 liberation from metacarbonates during orogenesis.
资助项目National Key R&D Program of China[2018YFA0702701] ; National Science Foundation of China[41490614] ; National Science Foundation of China[41672059] ; National Science Foundation of China[41922013] ; State Key Laboratory of Lithospheric Evolution[SKL-Z202002] ; Youth Innovation Promotion Association CAS[2017090]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000617378900007
出版者AMER GEOPHYSICAL UNION
资助机构National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/100079]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Guo, Shun
作者单位1.Univ Bern, Inst Geol Sci, Bern, Switzerland
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
4.Myanmar Geosci Soc, Hlaing Univ Campus, Yangon, Myanmar
5.Univ Toronto, Dept Earth Sci, Toronto, ON, Canada
推荐引用方式
GB/T 7714		 Guo, Shun,Chu, Xu,Hermann, Joerg,et al. Multiple Episodes of Fluid Infiltration Along a Single Metasomatic Channel in Metacarbonates (Mogok Metamorphic Belt, Myanmar) and Implications for CO2 Release in Orogenic Belts[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2021,126(1):23.
APA Guo, Shun.,Chu, Xu.,Hermann, Joerg.,Chen, Yi.,Li, Qiuli.,...&Sein, Kyaing.(2021).Multiple Episodes of Fluid Infiltration Along a Single Metasomatic Channel in Metacarbonates (Mogok Metamorphic Belt, Myanmar) and Implications for CO2 Release in Orogenic Belts.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,126(1),23.
MLA Guo, Shun,et al."Multiple Episodes of Fluid Infiltration Along a Single Metasomatic Channel in Metacarbonates (Mogok Metamorphic Belt, Myanmar) and Implications for CO2 Release in Orogenic Belts".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 126.1(2021):23.

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来源：地质与地球物理研究所

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