Petrology and geochemistry of ultramafic rocks in the Mogok belt, Myanmar: Cumulates from high-pressure crystallization of hydrous arc melts
文献类型：期刊论文
| 作者 | Liu, Tong2; Liu, Chuan-Zhou1,2,3; Chen, Yi2; Guo, Shun2; Sein, Kyaing4; Dong, Xiao-Tao5 |
| 刊名 | GEOLOGICAL JOURNAL
 |
| 出版日期 | 2021-08-24 |
| 页码 | 20 |
| 关键词 | cumulates Mogok Myanmar ruby mineralization subduction zone ultramafic rocks |
| ISSN号 | 0072-1050 |
| DOI | 10.1002/gj.4238 |
| 英文摘要 | The Mogok metamorphic belt (MMB) in central Myanmar is well known for its complex tectonics, magmatism, and metamorphism in the framework of Tethyan subduction and India-Asia collision. It is also world renowned due to the gemstone-class rubies and sapphires. Identification and discrimination of those petrological units in this region therefore are important for understanding the gemstone mineralization. Ultramafic massifs also crop out together with the gemstone-bearing metamorphic rocks in the MMB. It is still poorly constrained about their origin (i.e., mantle peridotites of Jurassic-Cretaceous ophiolites or cumulate rocks) and their relationship with the gemstone generation. Here, we report petrological and geochemical data for the Mogok ultramafic rocks. Petrographic observations show that they have typical cumulate textures, with a crystallization order of olivine/spinel-orthopyroxene-clinopyroxene. They have low whole-rock Al2O3 and CaO, and extremely high spinel Cr# (=Cr/[Cr + Al]; up to 0.86). Clinopyroxenes of these rocks show light rare earth element enriched patterns when normalized to CI chondrite. The results suggest that the Mogok ultramafic rocks have different compositions, both whole-rock and mineral, from mantle peridotites of Myanmar ophiolites, such as the Kalaymyo and Myitkyina ophiolites, but resemble typical Alaskan-type ultramafic cumulates. Therefore, the Mogok ultramafic rocks are cumulates generated by high-pressure crystallization of hydrous arc melts, probably during the subduction of the Tethyan oceanic slab. We argue that the emplacement of these arc melts may have provided additional heat for the earlier magmatic rocks and regional high-temperature metamorphism, although there is a need to further constrain the ages of these rocks. This, along with magmatism and metamorphism during post-collisional extension, probably collectively contributed to the generation of world-class coloured gemstone mineralization. |
| WOS关键词 | ZIRCON U-PB ; CRYSTAL FRACTIONATION ; MANTLE PERIDOTITES ; MINERAL CHEMISTRY ; OPHIOLITE ; PLAGIOCLASE ; SPINEL ; RIDGE ; HF ; CLINOPYROXENE |
| 资助项目 | National Science Fund for Distinguished Young Scholars[42025201] ; National Natural Science Foundation of China[41802062] ; Key Research Program of Frontier Sciences from CAS[QYZDB-SSW-DQC032] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000687805100001 |
| 出版者 | WILEY |
| 资助机构 | National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Science Fund for Distinguished Young Scholars ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102606]  |
| 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 | Liu, Tong; Liu, Chuan-Zhou |
| 作者单位 | 1.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100101, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Hlaing Univ Campus, Myanmar Geosci Soc, Yangon, Myanmar 5.6 Inst Geol & Mineral Resources Explorat Shandong, Weihai, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Tong,Liu, Chuan-Zhou,Chen, Yi,et al. Petrology and geochemistry of ultramafic rocks in the Mogok belt, Myanmar: Cumulates from high-pressure crystallization of hydrous arc melts[J]. GEOLOGICAL JOURNAL,2021:20. |
| APA | Liu, Tong,Liu, Chuan-Zhou,Chen, Yi,Guo, Shun,Sein, Kyaing,&Dong, Xiao-Tao.(2021).Petrology and geochemistry of ultramafic rocks in the Mogok belt, Myanmar: Cumulates from high-pressure crystallization of hydrous arc melts.GEOLOGICAL JOURNAL,20. |
| MLA | Liu, Tong,et al."Petrology and geochemistry of ultramafic rocks in the Mogok belt, Myanmar: Cumulates from high-pressure crystallization of hydrous arc melts".GEOLOGICAL JOURNAL (2021):20. |
入库方式： OAI收割
来源：地质与地球物理研究所
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