Unraveling the link between mantle upwelling and formation of Sn-bearing granitic rocks in the world-class Dachang tin district, South China
文献类型：期刊论文
| 作者 | Guo, Jia2,3; Wu, Kai4; Seltmann, Reimar5; Zhang, Rongqing1; Ling, Mingxing6; Li, Congying3; Sun, Weidong3
|
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2022-03-01 |
| 卷号 | 134期号:3-4页码:1043-1064 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B35492.1 |
| 通讯作者 | Zhang, Rongqing(rqzhang@nju.edu.cn) |
| 英文摘要 | Increasing evidence shows that the man-tle contributes (directly or indirectly) to Sn-bearing granites worldwide. However, the specific role of mantle in the formation of tin granites and related mineralization remains poorly understood. In the world-class Dachang district, South China, tin mineralization is related to the Longxiang-gai equigranular/porphyritic biotite granites and tin orebodies are cut by granite por-phyry dykes hosting mafic microgranular enclaves (MMEs). A combination of zircon U-Pb dating and Hf-O isotopes, mineral chemistry, and whole-rock elemental and Sr-Nd isotopic compositions-for granitic rocks and MMEs, is employed to constrain the petrogenesis and to unravel the link between tin fertility and mantle upwell-ing. Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) zircon U-Pb dating indicates that the biotite granites were emplaced at ca. 93 Ma, and the granite porphyry dykes and MMEs were formed at ca. 86 Ma. The biotite granites are silica-and alkali-enriched with A/CNK ratios of 1.04-1.36, and exhibit elevated con-centrations of Li, F, P, Rb, Cs, Ta, Sn, W, and U, showing affinities with highly fraction-ated S-type granites. Whole-rock geochemi-cal and Nd isotopic (epsilon(Nd)(t) = -10.0 to -7.8) data, and in situ zircon Hf-O (epsilon(Hf)(t) = -9.9 to -3.9, delta O-18 = 6.2-8.9%0) isotopes indicate that the biotite granites were formed by partial melting of metasedimentary rocks at relatively high temperatures (>= 782 degrees C), possibly with minor input of mantle mate-rial. Likewise, the post-ore granite porphyry dykes have similar chemical and mineral-ogical characteristics as fractionated S-type granites. Zircon Hf-O isotopes (epsilon(Hf)(t) = -9.0 to -4.9, delta O-18 = 6.5-8.2 parts per thousand) and whole-rock geochemical data suggest they were derived from a similar source as the biotite granites, whereas elevated epsilon(Nd)(t) values of -5.0 to -3.3 for granite porphyry dykes relative to biotite granites reveal an increasing mantle input. Distinct epsilon(Nd)(t) (-0.4 and -0.3) and zircon Hf-O (epsilon Hf(t) = 1.5-5.0, delta O-18 = 6.5-7.2 parts per thousand) iso-topes of the MMEs, suggest that the mafic melt could be sourced from the astheno-spheric mantle, contaminated by subconti-nental lithospheric mantle/continental crust during magma ascent, and hybridized by fel -sic melt at emplacement-level. The magmatic sequence in the Dachang district is indica-tive of an extensional tectonic setting where mantle-derived magmas are predicted to mi-grate to shallower crustal levels as the crust progressively becomes thinner and hotter. High-temperature partial melting of mature metasedimentary crust triggered by heat in-put from the upwelled mantle, may contrib-ute to biotite breakdown, which is important for concentrating tin in melts. Fractional crystallization of initially Sn-rich felsic melts under reduced conditions makes further tin enrichment and produces Sn-bearing gran-ites (the Longxianggai pluton). Prolonged mantle upwelling results in distinct magma mixing and the formation of granite por-phyry dykes and MMEs. These dykes are highly fractionated with elevated Sn and W contents, which show great potential to form hydrothermal Sn-W mineralization. |
| 资助项目 | National Key Research and Development Program of China[2016YFC0600408] ; Youth Innovation Promotion Association CAS[2016315] ; National Natural Science Foundation of China[41702092] ; Everest Scientific Research Program[2020ZF11413] ; joint patronage of the International Union of Geological Sciences and United Nations Educational, Scientific and Cultural Organization[662] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | GEOLOGICAL SOC AMER, INC |
| WOS记录号 | WOS:000765012000003 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/178462]  |
| 专题 | 海洋研究所_深海极端环境与生命过程研究中心 |
| 通讯作者 | Zhang, Rongqing |
| 作者单位 | 1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210023, Peoples R China 2.Chengdu Univ Technol, Coll Earth Sci, Chengdu 610059, Peoples R China 3.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 4.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 5.Nat Hist Museum, Dept Earth Sci, Cromwell Rd, London SW7 5BD, England 6.East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Jiangxi, Peoples R China |
| 推荐引用方式 GB/T 7714 | Guo, Jia,Wu, Kai,Seltmann, Reimar,et al. Unraveling the link between mantle upwelling and formation of Sn-bearing granitic rocks in the world-class Dachang tin district, South China[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2022,134(3-4):1043-1064. |
| APA | Guo, Jia.,Wu, Kai.,Seltmann, Reimar.,Zhang, Rongqing.,Ling, Mingxing.,...&Sun, Weidong.(2022).Unraveling the link between mantle upwelling and formation of Sn-bearing granitic rocks in the world-class Dachang tin district, South China.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,134(3-4),1043-1064. |
| MLA | Guo, Jia,et al."Unraveling the link between mantle upwelling and formation of Sn-bearing granitic rocks in the world-class Dachang tin district, South China".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 134.3-4(2022):1043-1064. |
入库方式： OAI收割
来源：海洋研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。