A case example of the importance of multi-analytical approach in deciphering carbonatite petrogenesis in South Qinling orogen: Miaoya rare-metal deposit, central China
文献类型：期刊论文
| 作者 | Xu, Cheng1; Kynicky, Jindrich2; Chakhmouradian, Anton R.3; Li, Xianhua4; Song, Wenlei1 |
| 刊名 | LITHOS
 |
| 出版日期 | 2015-06-15 |
| 卷号 | 227页码:107-121 |
| 关键词 | Carbonatite Syenite Petrogenesis Carbonated Ocean Crust South Qinling Orogen |
| DOI | 10.1016/j.lithos.2015.03.024 |
| 文献子类 | Article |
| 英文摘要 | The South Qinling orogen in central China hosts carbonatites occurring as stocks associated with syenites and collectively regarded as the Miaoya intrusive complex. The complex hosts economic resources of rare-earth elements (REE) and Nb. The Miaoya syenites are strongly metasomatized at the contact with the carbonatites and cross-cut by carbonate and felsic veinlets. Small oscillatory-zoned crystals of zircons from the syenites give a concordant U-Pb age of 147 +/- 0.5 Ma, which differs significantly from the ages of both large magmatic zircon grains from the syenites and primary monazite from the carbonatites (766 Ma and 234 Ma, respectively). To account for the possibility that the Miaoya syenites are coeval and cogenetic with the carbonatites, the trace-element budget of both rock types was examined in detail. The Miaoya carbonatite contains primary REE-rich fluorapatite and monazite, which precipitated earlier than the rock-forming REE-poor calcite, indicating that the primary carbonatitic magma was rich in REE. The compositions of the parental syenitic and carbonatitic magmas, calculated on the basis of the trace-element composition of primary fluorapatite in the two rock suites, show that the carbonatitic magma contained higher Sr and REE (La-Tb), but lower Ba, Pb, Th, U, Nb and Ta levels in comparison with the syenitic melt. These differences are inconsistent with derivation of the Miaoya rocks from a homogeneous carbonate-silicate melt by immiscibility or crystal fractionation. It is therefore concluded that the carbonatitic magma at Miaoya was generated directly in the mantle. Emplacement of the carbonatites in the South Qinling orogen marked transition to a postorogenic regime, and was preceded by oceanic crust subduction and closure of the Mianlue Ocean in the Triassic. Our models show that melting of the Mianlue crust and up to 10 wt.% of sediments cannot produce the levels of REE enrichment observed in the Miaoya carbonatites. More complex models, involving recycling of the Mianlue oceanic crust and a REE-rich carbonate liquid from an old deep-seated mantle source are required to explain the observed trace-element characteristics of the Miaoya carbonatites. (c) 2015 Elsevier B.V. All rights reserved. |
| WOS关键词 | SILICATE MELT INCLUSIONS ; TRACE-ELEMENTS ; U-PB ; TECTONIC IMPLICATIONS ; CHEMICAL-COMPOSITION ; CONTINENTAL-CRUST ; GRANITOID ROCKS ; MANTLE ; GEOCHEMISTRY ; EVOLUTION |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000356115800007 |
| 资助机构 | Chinese National Science Foundation(41222022 ; Chinese National Science Foundation(41222022 ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; 41173033) ; 41173033) ; Chinese National Science Foundation(41222022 ; Chinese National Science Foundation(41222022 ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; 41173033) ; 41173033) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62515]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 作者单位 | 1.Peking Univ, Sch Earth & Space Sci, Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China 2.Mendel Univ Brno, Dept Geol & Pedol, Brno, Czech Republic 3.Univ Manitoba, Dept Geol Sci, Winnipeg, MB R3T 2N2, Canada 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Cheng,Kynicky, Jindrich,Chakhmouradian, Anton R.,et al. A case example of the importance of multi-analytical approach in deciphering carbonatite petrogenesis in South Qinling orogen: Miaoya rare-metal deposit, central China[J]. LITHOS,2015,227:107-121. |
| APA | Xu, Cheng,Kynicky, Jindrich,Chakhmouradian, Anton R.,Li, Xianhua,&Song, Wenlei.(2015).A case example of the importance of multi-analytical approach in deciphering carbonatite petrogenesis in South Qinling orogen: Miaoya rare-metal deposit, central China.LITHOS,227,107-121. |
| MLA | Xu, Cheng,et al."A case example of the importance of multi-analytical approach in deciphering carbonatite petrogenesis in South Qinling orogen: Miaoya rare-metal deposit, central China".LITHOS 227(2015):107-121. |
入库方式： OAI收割
来源：地质与地球物理研究所
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