| 几种重要热液矿床成矿的岩浆作用贡献探讨 |
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| 关键词:underground water stratified hydrothermal deposit underground brine polymetallic deposit MVT Pb–Zn deposit Carlin-type gold deposit metamorphic hydrothermal deposit ductile shear zone-type gold deposit |
| 基金项目:中国地质调查局项目(编号: DD20221695);湖南省自然资源厅项目(编号: 湘资发[2020]41号);湖南省地质院科研项目(编号: 201702) |
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| Magmatic Contributions to the Mineralization of Several Important Hydrothermal Deposits |
| Based on the fundamental theoretical knowledge of relevant basic disciplines within the earth sciences, in combination with an understanding of geological work practices and an analysis of the geological characteristics of mineral deposits, this study examined the contribution of magmatism to the mineralization of several important hydrothermal deposits and revealed some new understandings. The results of the study follow: ① Groundwater is alternately cycled through recharge and drainage, so it is difficult to realize the gradual transformation to ore-bearing hydrothermal mineralization through the simple groundwater cycle. Ore-forming fluids in groundwater-stratified hydrothermal deposits frequently undergo a hot water cycle propelled by deep magma chambers. ② Underground brine is not the formative source of endogenous polymetallic deposits, and it does not have the metallogenic material conditions for the formation of polymetallic deposits. The polymetallic elements in the hot brine within the geothermal anomaly zone at the edge of a plate are provided by the strong volcanic activity caused by plate interaction. The brine plays the roles of activation, enrichment, and transportation of metallic elements. ③ The deposit characteristics of MVT-type lead-zinc deposits and Carlin-type gold deposits indicate that their mineralization is genetically related to magmatic-hydrothermal activity. ④ According to the definitions of metamorphism and metamorphic rocks, all changes occur under solid conditions, and it is difficult for metamorphic hydrothermal deposits to form as a result of metamorphism and metamorphic rocks. Their genetic types can be classified as magmatic-hydrothermal deposits. ⑤ The ductile shear zone is a zone of plastic deformation under the action of magmatic thermodynamics and tectonic stress, and the mineralization that occurs is associated with the emplacement of magmatic-hydrothermal fillings in the late brittle fracture stage. A correct understanding of deposit genesis effectively guides prospecting work, and magmatic mineralization is a widespread and potent mineralization. |
| ZENG Qinwang,SHI Shaohua,QIAN Tao,WU Chengdong,PAN Junhua,WEI Yuanbeng,CHEN Yulin.2024.Magmatic Contributions to the Mineralization of Several Important Hydrothermal Deposits[J].Acta Geoscientica Sinica,45(3):337-348. |
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