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  2. 地质与地球物理研究所
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  4. 中国科学院矿产资源研究重点实验室
Eocene arc magmatism and related Cu-Au (Mo) mineralization in the Shangalon-Kyungalon district, Wuntho-Popa Arc, northern Myanmar

文献类型：期刊论文

作者Hutt, Thiri Ye3,4,5; Qin, Kezhang3,4,5; Li, Guangming3,4,5; Sein, Kyaing2; Evans, Noreen J.1
刊名ORE GEOLOGY REVIEWS
出版日期2020-10-01
卷号125页码:16
关键词Shangalon-Kyungalon ore district Zircon U-Pb dating Sr-Nd-Hf isotopic Wuntho-Popa Arc Neo-Tethyan Ocean Porphyry and epithermal Cu-Au mineralization
ISSN号0169-1368
DOI10.1016/j.oregeorev.2020.103678
英文摘要The Shangalon-Kyungalon Cu-Au (Mo) ore district is located on the south-eastern margin of the Kanzachaung batholith in the Wuntho-Popa Arc, Myanmar. Porphyry and epithermal Cu-Au mineralization are associated with the Late-Eocene magmatic rocks. In this study, zircon U-Pb dating of gabbroic diorite, diorite porphyry, tonalite porphyry, and granodiorite yielded ages of 38.0 +/- 0.35 Ma, 37.8 +/- 0.35 Ma, 37.4 +/- 0.27 Ma, and 36.9 +/- 0.26 Ma, respectively. These rocks show sub-alkaline characteristics, LREE-enriched patterns with weakly positive/negative Eu anomalies, enrichment of LILEs and depletion of HFSEs. They have obviously higher initial Sr ratios and lower epsilon Nd(t) and epsilon Hf(t) values (I-sr = 0.7066; epsilon Nd(t) = -0.5 to -4.8; epsilon Hf (t) = 0.7-9.7) than the mid-Cretaceous Kanzachaung batholith (I-sr = 0.7046; epsilon Nd(t) = 2.4-4.5; epsilon Hf (t) = 10.9-15.1), indicating crustal materials were most likely added to the arc magma source. In particular, the gabbroic diorite has higher initial Sr, more enriched Nd-Hf isotopic compositions (I-sr = 0.7081, epsilon Nd(t) = - 4.6 to -4.8, epsilon Hf(t) = 0.7-2.3) and lower SiO2 content relative to the other magmatic rocks studied (I-sr = 0.7068-0.7059; epsilon Nd(t) = -0.5 to -2.8, epsilon Hf(t) = 5.0-9.7). The results suggest that the gabbroic diorite was derived from melting of a mantle wedge, metasomatized by subducted oceanic sediment. Underplating on juvenile lower crust followed, accompanied by MASH processes, which led to increased epsilon Nd(t) (and SiO2 content) and decreased initial Sr ratios in later formed rocks. Moreover, the adakite-like features (Sr/Y = 19.3-53.4, Y = 7.54-18.8,) suggest fractional crystallization of hornblende in a hydrous magma, potentially leading to formation of the Shangalon-Kyungalon porphyry-epithermal Cu-Au system. In summary, the Late-Eocene magmas in Shangalon-Kyungalon formed from a mantle source metasomatized by subducted sediments during Neo-Tethyan subduction beneath Western Burma terrane, with the involvement of juvenile crustal materials.
WOS关键词ZIRCON U-PB ; PORPHYRY COPPER BELT ; IN-SITU ANALYSIS ; SOUTHERN TIBET ; HF ISOTOPES ; TECTONIC EVOLUTION ; GANGDESE BATHOLITH ; LU-HF ; MASS-SPECTROMETRY ; VOLCANIC-ROCKS
资助项目CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research[2019QZKK0806] ; National Natural Science Foundation of China[41872086]
WOS研究方向Geology ; Mineralogy ; Mining & Mineral Processing
语种英语
WOS记录号WOS:000571217000003
出版者ELSEVIER
资助机构CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS-TWAS President's Fellowship ; CAS-TWAS President's Fellowship ; Second Tibetan Plateau Scientific Expedition and Research ; Second Tibetan Plateau Scientific Expedition and Research ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/98267]  
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Qin, Kezhang
作者单位1.Curtin Univ, Sch Earth & Planetary Sci, John de Laeter Ctr, Perth, WA 6945, Australia
2.Myanmar Geosci Soc, Yangon 11041, Myanmar
3.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Hutt, Thiri Ye,Qin, Kezhang,Li, Guangming,et al. Eocene arc magmatism and related Cu-Au (Mo) mineralization in the Shangalon-Kyungalon district, Wuntho-Popa Arc, northern Myanmar[J]. ORE GEOLOGY REVIEWS,2020,125:16.
APA Hutt, Thiri Ye,Qin, Kezhang,Li, Guangming,Sein, Kyaing,&Evans, Noreen J..(2020).Eocene arc magmatism and related Cu-Au (Mo) mineralization in the Shangalon-Kyungalon district, Wuntho-Popa Arc, northern Myanmar.ORE GEOLOGY REVIEWS,125,16.
MLA Hutt, Thiri Ye,et al."Eocene arc magmatism and related Cu-Au (Mo) mineralization in the Shangalon-Kyungalon district, Wuntho-Popa Arc, northern Myanmar".ORE GEOLOGY REVIEWS 125(2020):16.

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来源：地质与地球物理研究所

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