| 甘肃黑石山埃达克岩金矿床成矿模式初析 |
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| 引用本文：.2005.Metallogenic model of Heishishan adakite gold deposit in Gansu Province[J].Mineral Deposits,24(6):669~675 |
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| 基金项目:国家科技部973项目（2002CB412600）和国家教育部博士点基金（20040558050） |
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| 中文摘要:甘肃黑石山埃达克岩属O型埃达克岩，其岩石类型为奥长花岗岩。岩体位于黑石山穹隆南缘，西湾—苏家湾断裂北部上盘。在该埃达克岩体中发育有金矿床，矿床类型为含金石英脉型及蚀变花岗岩型。研究认为该矿床的形成主要经历了3个阶段：Ⅰ.次生洋板片俯冲并发生部分熔融形成埃达克质熔体；Ⅱ.熔体与地幔楔橄榄岩及幔源熔体的相互作用(金属的萃取)使熔体富集成矿元素；Ⅲ.熔体向上侵入成岩，后期构造运动及热液成矿作用使成矿元素活化迁移并最终富集成矿。 |
| 中文关键词:地质学 埃达克岩 成矿模式 金矿床 板块俯冲 甘肃黑石山 |
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| Metallogenic model of Heishishan adakite gold deposit in Gansu Province |
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| Abstract:The adakite in Heishishan of Ganshu Province is of O_type composed of trondhjemite. A gold deposit occurs in adakite body lying on the southern margin of Heishishan dome and the northern hanging wall of Xiwan-Sujiawan fault. The deposit is of the auriferous quartz vein and altered granite type. Studies show that the metallogenic model of the gold deposit can be divided into three phases: Ⅰ. Adakitic melt was formed by melting of the subducting secondary oceanic slab; Ⅱ. The melt extracted a mass of metallic elements gold and silver during its reaction with mantle peridotite when it migrated upward to the mantle wedge; Ⅲ. The adakite rock was formed during the uplifting and cooling of the melt, and late tectonic movement and hydrothermal ore_forming process activated gold element and caused mineralization. A study of this model of O_type adakite formed by the melting of subducting oceanic slab is of great significance in the exploration of ore deposits related to O_type adakite. |
| keywords:geology, adakite, metallogenic model, gold deposit, plate subduction, Heishishan in Gansu Province |
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