| 鲁西平邑磨坊沟碲金型金矿的地质特征及成因机制 |
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| 关键词:Mofanggou gold deposit tellurium-gold type detachment-slip zone mantle-branch structure |
| 基金项目:中国地质调查局地质调查项目(编号:200110200038);国家自然科学基金项目(编号:40272088);国家重点基础规划发展项目(编号:G1999043211) |
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| Geological Features and Formation Mechanism of the Mofanggou Tellurium-gold Deposit in Pinyi Area, Western Shandong |
| This paper described the measured section ofthe Mofanggou golddeposit, studied in detail characteristics of alterations and fluid inclusions as well as stable isotopes, and discussed the formation mechanism of the deposit.The Mofanggou gold deposit, stratoid in form, occurs in Early Cambrian Zhushadong Formation which overlies the principal detachment-slip zone between Cambrianstrata and Archaeozoic gneissose granodiorite or Palaeoproterozoic adamellite. Wall-rock alterations include kaolinization, pyritization, silicification, sericitization, calcitization and fluoritization. Gold ores are related to pyritization, silicification and calcitization. Gold minerals are native gold, petzite andelectrum. The homogenization temperature of the fluid inclusions mainly rangesfrom 103 ℃ to 220 ℃. The salinity varies from 4.65% to 13.18%. Sulfur isotope studies demonstrate that sulfur was derived from the mantle, and oxygen isotope analyses reveal that the fluid of the deposit was a mixed source of magmatic water and atmospheric water. The ore-forming fluids originated from the multipleevolution of North China sub-mantle plume, migrated through deep and shallow detachment-slip zones of Luxi mantle-branch structure, and were eventually unloaded in flats and ramps of secondary detachment-slip zones. |
| HU Hua-bin,NIU Shu-yin,MAO Jing-wen,SUN Ai-qun,XU Chuan-shi.2004.Geological Features and Formation Mechanism of the Mofanggou Tellurium-gold Deposit in Pinyi Area, Western Shandong[J].Acta Geoscientica Sinica,25(5):523-528. |
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