UHP impure marbles from the Dabie Mountains: Metamorphic evolution and carbon cycling in continental subduction zones

doi:10.1016/j.lithos.2014.11.018

	UHP impure marbles from the Dabie Mountains: Metamorphic evolution and carbon cycling in continental subduction zones
	Liu, Penglei 1; Wu, Yao 1; Chen, Yi 2; Zhang, Junfeng 1; Jin, Zhenmin 1
刊名	LITHOS
	2015
卷号	212 页码:280-297
关键词	UHP impure marble Coesite within dolomite Dolomite breakdown P-T-X(CO2) path Carbon sequestration
ISSN号	0024-4937
DOI	10.1016/j.lithos.2014.11.018
文献子类	Article
英文摘要	Impure marbles from ultra-high pressure (UHP) metamorphic belts bear significant information on the metamorphic evolution and carbon cycling during continental subduction and exhumation. In this study, detailed petrological data are presented and a P-T-X(CO2) path is constructed for the impure marbles from the Dabie UHF terrane. Coesite relicts are discovered as inclusions within dolomite from the selected samples, which have a peak assemblage of dolomite, aragonite, garnet, omphacite, phengite, coesite, allanite and rutile. Estimated with the compositions of peak minerals, a P-T condition of 4.05-4.45 GPa at 740-820 degrees C is obtained by conventional geothermobarometry. The modeled fluid compositions have a low X(CO2) (0.01-0.02) at the peak conditions, while the X(CO2) firstly increased during isothermal exhumation and then decreased at later retrogression. The discovery of coesite within dolomite underscores the role of the "pressure vessel" models and highlights the significance of fluid unavailability in preserving coesite in UHP rocks. Neither petrological evidence nor independent peak P-T estimations support the breakdown of dolomite in the studied marbles, which contests recent suggestions. Analysis on the phase relations in the CaO-MgO-SiO2-H2O-CO2 system shows that the bulk rock compositions have a large control on the stable UHP carbonate associations in carbonate-bearing rocks. The low X(CO2) in the peak fluids indicates a weak decarbonation of the impure marbles under sub-arcs. In the last, a large fraction of CO2 is shown to be sequestrated during regional retrogression of clinopyroxene marbles, which has a profound influence and must be considered for the global carbon cycling. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词	ULTRAHIGH-PRESSURE METAMORPHISM ; EAST-CENTRAL CHINA ; STABLE-ISOTOPE GEOCHEMISTRY ; COESITE-BEARING ECLOGITE ; ARAGONITE PLUS MAGNESITE ; MINERAL CHEMISTRY ; KOKCHETAV MASSIF ; DOLOMITIC MARBLE ; WESTERN TIANSHAN ; FERRIC IRON
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000348879200019
资助机构	Ministry of Land Resources of China(1212010918012) ; Ministry of Land Resources of China(1212010918012) ; Natural Science Foundation of China(41430209 ; Natural Science Foundation of China(41430209 ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; 41272078) ; 41272078) ; Ministry of Land Resources of China(1212010918012) ; Ministry of Land Resources of China(1212010918012) ; Natural Science Foundation of China(41430209 ; Natural Science Foundation of China(41430209 ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; 41272078) ; 41272078) ; Ministry of Land Resources of China(1212010918012) ; Ministry of Land Resources of China(1212010918012) ; Natural Science Foundation of China(41430209 ; Natural Science Foundation of China(41430209 ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; 41272078) ; 41272078) ; Ministry of Land Resources of China(1212010918012) ; Ministry of Land Resources of China(1212010918012) ; Natural Science Foundation of China(41430209 ; Natural Science Foundation of China(41430209 ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)(CUG120121) ; 41272078) ; 41272078)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86850]
专题	中国科学院地质与地球物理研究所
通讯作者	Wu, Yao
作者单位	1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Liu, Penglei,Wu, Yao,Chen, Yi,et al. UHP impure marbles from the Dabie Mountains: Metamorphic evolution and carbon cycling in continental subduction zones[J]. LITHOS,2015,212:280-297.
APA	Liu, Penglei,Wu, Yao,Chen, Yi,Zhang, Junfeng,&Jin, Zhenmin.(2015).UHP impure marbles from the Dabie Mountains: Metamorphic evolution and carbon cycling in continental subduction zones.LITHOS,212,280-297.
MLA	Liu, Penglei,et al."UHP impure marbles from the Dabie Mountains: Metamorphic evolution and carbon cycling in continental subduction zones".LITHOS 212(2015):280-297.