Mantle contributions to granitoids associated with Sn mineralization: Geochemical and isotopic evidence from the giant Dachang deposit, South China
文献类型：期刊论文
| 作者 | Wang, Tingyi1,6; Shu, Qihai1; Xia, Xiaoping5 ; Li, Chao4; Wang, Yanning1; Chen, Jiahao1; Sun, Xiang1; Santosh, M.1,3; Wang, Qingfei1,2,6
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| 刊名 | GEOSCIENCE FRONTIERS
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| 出版日期 | 2024 |
| 卷号 | 15期号:1页码:22 |
| 关键词 | Highly evolved S-type biotite granite I-type granodiorite porphyry dike Crust-mantle mixing Mantle contributions Dachang Sn mineralization |
| ISSN号 | 1674-9871 |
| DOI | 10.1016/j.gsf.2023.101718 |
| 英文摘要 | Major Sn deposits are commonly linked to crust-derived and highly evolved granites, with magma generation aided by mantle heating. However, whether and how the mantle components contribute to Sn polymetallic mineralization remains unclear. In this study, in combination with a compilation of equivalent data in the region, we provide new constraints on this issue based on detailed investigations on the petrogenesis and metallogenic significance of granitoids including the causative batholith and later granodiorite porphyry dike in the giant Dachang Sn deposit from South China. The former has zircon U-Pb ages of 93-91 Ma and belongs to highly evolved S-type biotite granite, which experienced fractionation of massive feldspar. The latter shows zircon U-Pb ages of 90 Ma and displays I-type granite features. The batholith was mainly derived from the dehydration melting of biotite in the metasedimentary sources, as revealed by the relatively low whole-rock Pb contents (<30 ppm) and high Ba/Pb ratios (2.71-17.1) and initial T(ti-zr) of 790 degree celsius. Compared with the adjacent crust-derived S-type granites (-24.8 - -5.1) and I-type granites (-11.0 to -5.2), the Dachang S-type biotite granites present higher zircon epsilon Hf(t) values (-9.1 to -2.1). Furthermore, the low magmatic zircon delta O-18 values (6.2 parts per thousand) and higher apatite LREE (3277-4114 ppm) and Sr (1137-1357 ppm) contents than of arc-type basic rocks were discerned. These characteristics jointly hint the contributions of mantle components. The higher initial T(ti-zr) (>850 degrees C), whole-rock Mg-# (52 to 58), apatite epsilon(Nd)(t) (-9.2 to -6.5) and zircon epsilon(Hf)(t) (-7.6 to 2.5) values but lower zircon delta O-18 values (6.33 to 8.30 parts per thousand) of the later granodiorite porphyry dike than those of the batholith also suggest that mantle material was involved in the generation of the dikes, which is evident by the variational features of zircon and apatite trace elements. In addition, at the zircon Hf <12000 ppm and Eu/Eu* > 0.05, the higher zircon Delta FMQ values (mostly from -1.8 to 2.0) and H2O contents (100-1100 ppm) of the Dachang granitoids than the pure crust-derived S-type granites (Delta FMQ = mostly from -3.7 to -1.5; H2O < 100 ppm) imply that mantle materials involved are relatively rich in water and oxidized. These suggest that the addition of mantle components is conducive to the extraction of Sn from metasedimentary sources, and moderately facilitates the increase of oxygen fugacity which still maintains the incompatibility of Sn in magmas with Delta FMQ < 2. Also, the involvement of mantle components upgrades the H2O contents in S-type magmas, favoring the migration of ore-forming elements from magmas to hydrothermal fluids. The sediment-derived causative granites displayed higher epsilon(Hf)(t) and epsilon(Nd)(t) values with greater Sn tonnages of their associated world-class Sn polymetallic deposits, supporting the opinion that the contributions of mantle components play an important role in the generation of giant Sn deposits. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001110299900001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/79008]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Wang, Qingfei |
| 作者单位 | 1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China 2.East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Peoples R China 3.Univ Adelaide, Dept Earth Sci, Adelaide, SA 5005, Australia 4.Chinese Acad Geol Sci, Natl Res Ctr Geoanal, Beijing 100037, Peoples R China 5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 6.China Univ Geosci Beijing, Frontiers Sci Ctr Deep Time Digital Earth, Beijing 100083, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Tingyi,Shu, Qihai,Xia, Xiaoping,et al. Mantle contributions to granitoids associated with Sn mineralization: Geochemical and isotopic evidence from the giant Dachang deposit, South China[J]. GEOSCIENCE FRONTIERS,2024,15(1):22. |
| APA | Wang, Tingyi.,Shu, Qihai.,Xia, Xiaoping.,Li, Chao.,Wang, Yanning.,...&Wang, Qingfei.(2024).Mantle contributions to granitoids associated with Sn mineralization: Geochemical and isotopic evidence from the giant Dachang deposit, South China.GEOSCIENCE FRONTIERS,15(1),22. |
| MLA | Wang, Tingyi,et al."Mantle contributions to granitoids associated with Sn mineralization: Geochemical and isotopic evidence from the giant Dachang deposit, South China".GEOSCIENCE FRONTIERS 15.1(2024):22. |
入库方式： OAI收割
来源：广州地球化学研究所
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