The genesis of gold deposits in the Hetai goldfield, South China: New constraints from geochronology, fluid inclusion, and multiple isotopic studies
文献类型：期刊论文
| 作者 | Wang, Lixing3; Zhao, Zhaoxia3; Huang, Qinyi3; Xu, Deru4; Jiao, Qianqian1; Chen, Genwen; Cai, Jianxin5; Zou, Shaohao3; Deng, Teng4; Shan, Qiang |
| 刊名 | GEOLOGICAL JOURNAL
 |
| 出版日期 | 2020 |
| 卷号 | 55期号:4页码:2447 |
| 关键词 | auriferous mylonitic zone fluid inclusions geochronology Hetai goldfield H-O-S-Pb isotopes |
| ISSN号 | 1099-1034 |
| DOI | 10.1002/gj.3516 |
| 英文摘要 | The Hetai goldfield is one of the largest gold mining districts in the South China Block. A complex paragenesis consists of three mineralization stages: syntectonic metamorphic stage, hydrothermal stage, and supergene stage. The syntectonic metamorphic stage is characterized by banded quartz (Q1) and invisible Au in mylonites. The hydrothermal stage, which is the main gold mineralization stage, can be divided into three substages: an early substage characterized by coarse-grained quartz (Q2) + pyrite + arsenopyrite + pyrrhotite, an intermediate substage characterized by gray fine-grained quartz (Q3) + electrum + poly-sulphides + sericite + chlorite and a late substage with predominate white quartz (Q4) + calcite as well as lesser sulphides. During the supergene stage, malachite, covellite, and limonite were formed. Four types of fluid inclusions (FIs) in these types of quartz were identified: aqueous FIs (type 1), CO2-bearing aqueous FIs (type 2), CO2-rich FIs (type 3), and solid-bearing FIs (type 4). Q1 only contains type 1 FIs; Q2 contains types 2 and 4 FIs; Q3 contains types 2 and 3 FIs; and Q4 only contains type 1 FIs. Microthermometric results show that the homogenization temperatures of fluid inclusions range from 350 degrees C to 400 degrees C for Q1, 250 degrees C to 320 degrees C for Q2, 138 degrees C to 245 degrees C for Q3, and 110 degrees C to 207 degrees C for Q4. Salinities of fluid inclusions range from 3.4 to 5.7 wt.%, 2.6 to 12.9 wt.%, 0.5 to 11.5 wt.%, and 0.2 to 7.3 wt.% for Q1, Q2, Q3, and Q4, respectively. Alteration minerals (sericite and chlorite) from the main mineralization stage have delta DH2O-VSMOW values of -62 parts per thousand to -98 parts per thousand and calculated delta(OH2O)-O-18-VSMOW values of 6.3 parts per thousand to 4.4 parts per thousand. The in situ sulphur isotope analysis of pyrite yields a narrow delta S-34(CDT) range of -1.5 parts per thousand to -5.2 parts per thousand (average -3.4 parts per thousand), combined with the Pb isotopic compositions of the sulphides, wall rocks, and Wucun pluton, revealing that the ore-forming material was mainly derived from magmatic source. The mineralization age (sericite Ar-40/Ar-39: 159.3 +/- 0.8 Ma) is close to the emplacement age of Wucun biotite monzonitic granite pluton (LA-ICP-MS zircon U-Pb age: 158.1 +/- 1.9 Ma). These geochemical and geochronological data suggest that the main phase of gold mineralization in the Hetai goldfield is genetically related to the granitic activities in the Late Jurassic rather than the mylonitization event in the Late Triassic to Early Jurassic. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18562]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 作者单位 | 1.East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Jiangxi, Peoples R China 2.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou, Peoples R China 4.Univ Chinese Acad Sci, Beijing, Peoples R China 5.Kunming Univ Sci & Technol, Dept Earth Sci, Kunming, Yunnan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Lixing,Zhao, Zhaoxia,Huang, Qinyi,et al. The genesis of gold deposits in the Hetai goldfield, South China: New constraints from geochronology, fluid inclusion, and multiple isotopic studies[J]. GEOLOGICAL JOURNAL,2020,55(4):2447, 2472. |
| APA | Wang, Lixing.,Zhao, Zhaoxia.,Huang, Qinyi.,Xu, Deru.,Jiao, Qianqian.,...&Shan, Qiang.(2020).The genesis of gold deposits in the Hetai goldfield, South China: New constraints from geochronology, fluid inclusion, and multiple isotopic studies.GEOLOGICAL JOURNAL,55(4),2447. |
| MLA | Wang, Lixing,et al."The genesis of gold deposits in the Hetai goldfield, South China: New constraints from geochronology, fluid inclusion, and multiple isotopic studies".GEOLOGICAL JOURNAL 55.4(2020):2447. |
入库方式： OAI收割
来源：南海海洋研究所
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