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Fingerprinting REE mineralization and hydrothermal remobilization history of the carbonatite-alkaline complexes, Central China: Constraints from in situ elemental and isotopic analyses of phosphate minerals

文献类型：期刊论文

作者Su, Jian-Hui1,4; Zhao, Xin-Fu1,4; Li, Xiao-Chun2,3; Su, Zhi-Kun1,4; Liu, Rui1,4; Qin, Zhi-Jun5; Chen, Mi5
刊名AMERICAN MINERALOGIST
出版日期2021-10-01
卷号106期号:10页码:1545-1558
ISSN号0003-004X
关键词Carbonatite-alkaline complex phosphate minerals REE mineralization in situ isotopic analyses metasomatic alteration Experimental Halogens in Honor of James Webster
DOI10.2138/am-2021-7746
英文摘要Carbonatites and related alkaline rocks host most REE resources. Phosphate minerals, e.g., apatite and monazite, commonly occur as the main REE-host in carbonatites and have been used for tracing magmatic and mineralization processes. Many carbonatite intrusions undergo metamorphic and/or metasomatic modification after emplacement; however, the effects of such secondary events are con-troversial. In this study, the Miaoya and Shaxiongdong carbonatite-alkaline complexes, in the South Qinling Belt of Central China, are selected to unravel their magmatic and hydrothermal remobilization histories. Both the complexes are accompanied by Nb-REE mineralization and contain apatite and monazite-(Ce) as the major REE carriers. Apatite grains from the two complexes commonly show typical replacement textures related to fluid metasomatism, due to coupled dissolution-reprecipitation. The altered apatite domains, which contain abundant monazite-(Ce) inclusions or are locally surrounded by fine-grained monazite-(Ce), have average REE concentrations lower than primary apatite. These monazite-(Ce) inclusions and fine-grained monazite-(Ce) grains are proposed to have formed by the leaching REE from primary apatite grains during fluid metasomatism. A second type of monazite-(Ce), not spatially associated with apatite, shows porous textures and zoning under BSE imaging. Spot analyses of these monazite-(Ce) grains have variable U-Th-Pb ages of 210-410 Ma and show a peak age of 230 Ma, which is signifi-cantly younger than the emplacement age (440-430 Ma) but is roughly synchronous with a regionally metamorphic event related to the collision between the North China Craton and Yangtze Block along the Mianlue suture. However, in situ LA-MC-ICP-MS analyses of those grains show that they have initial Nd values same as those of magmatic apatite and whole rock. We suggest these monazite-(Ce) grains crystallized from the early Silurian carbonatites and have been partially or fully modified during a Triassic metamorphic event, partially resetting U-Pb ages over a wide range. Mass-balance calcula-tions, based on mass proportions and the REE contents of monazite-(Ce) and apatite, demonstrate that the quantity of metasomatized early Silurian monazite-(Ce) is far higher than the proportion of monazite-(Ce) resulting from the metasomatic alteration of the apatite. Therefore, Triassic metamorphic events largely reset the U-Th-Pb isotopic system of the primary monazite-(Ce) and apatite but only had limited or local effects on REE remobilization in the carbonatite-alkaline complexes in the South Qinling Belt. Such scenarios may be widely applicable for other carbonatite and hydrothermal systems.
WOS关键词RARE-EARTH-ELEMENTS ; TH-PB GEOCHRONOLOGY ; SOUTH QINLING BELT ; BAYAN OBO ; OROGENIC BELT ; DISSOLUTION-REPRECIPITATION ; INNER-MONGOLIA ; TRACE-ELEMENTS ; ND ISOTOPES ; NB DEPOSIT
资助项目national key R&D program of China[2017YFC0602401] ; NSFC[41822203] ; NSFC[41902087] ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)[CUG140618] ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)[CUGCJ1711]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者MINERALOGICAL SOC AMER
WOS记录号WOS:000715849900001
资助机构national key R&D program of China ; national key R&D program of China ; NSFC ; NSFC ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; national key R&D program of China ; national key R&D program of China ; NSFC ; NSFC ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; national key R&D program of China ; national key R&D program of China ; NSFC ; NSFC ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; national key R&D program of China ; national key R&D program of China ; NSFC ; NSFC ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)
源URL[http://ir.iggcas.ac.cn/handle/132A11/103827]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Zhao, Xin-Fu
作者单位1.China Univ Geosci, Sch Earth Resources, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
4.China Univ Geosci, Sch Earth Resources, Wuhan 430074, Peoples R China
5.Geol Survey Hubei Prov, Wuhan 430034, Peoples R China
推荐引用方式
GB/T 7714		 Su, Jian-Hui,Zhao, Xin-Fu,Li, Xiao-Chun,et al. Fingerprinting REE mineralization and hydrothermal remobilization history of the carbonatite-alkaline complexes, Central China: Constraints from in situ elemental and isotopic analyses of phosphate minerals[J]. AMERICAN MINERALOGIST,2021,106(10):1545-1558.
APA Su, Jian-Hui.,Zhao, Xin-Fu.,Li, Xiao-Chun.,Su, Zhi-Kun.,Liu, Rui.,...&Chen, Mi.(2021).Fingerprinting REE mineralization and hydrothermal remobilization history of the carbonatite-alkaline complexes, Central China: Constraints from in situ elemental and isotopic analyses of phosphate minerals.AMERICAN MINERALOGIST,106(10),1545-1558.
MLA Su, Jian-Hui,et al."Fingerprinting REE mineralization and hydrothermal remobilization history of the carbonatite-alkaline complexes, Central China: Constraints from in situ elemental and isotopic analyses of phosphate minerals".AMERICAN MINERALOGIST 106.10(2021):1545-1558.

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来源：地质与地球物理研究所

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