| 刘云华.甘肃天水李子金矿床物质组分及金银赋存状态研究[J].地质与勘探,2011,47(5):837-845 |
| 甘肃天水李子金矿床物质组分及金银赋存状态研究 |
| Material Components and Occurrence States of Gold and Silver in theLizi Gold Deposit, Tianshui,Gansu Province |
| 投稿时间：2010-10-20 修订日期：2011-03-06 |
| DOI： |
| 中文关键词: 金矿床 物质组分 赋存状态 李子金矿 甘肃 |
| 英文关键词: gold deposit, material component, occurrence state, Lizi gold deposit, Gansu |
| 基金项目:中国黄金集团科研项目(编号ZGHJ-KY201015)资助 |
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| 中文摘要: |
| [摘要]甘肃天水李子金矿具有斑岩型和韧性剪切带型两种类型的金矿床。本文在详细野外工作的基础上,采用光薄片鉴定、人工重砂分析、化学成分分析、化学物相分析、电子探针波谱分析等技术方法,查明了矿床主要具有蚀变岩型和石英脉型两种金矿石类型,其中韧性剪切带型金矿矿石类型主要为石英脉型,斑岩型金矿矿石类型主要为斑岩型-蚀变岩型;韧性剪切带型金矿矿石以条带状构造、脉状-网脉状构造为主,斑岩型金矿矿石以浸染状构造、斑点状构造、块状构造为主。两种矿石类型主要载金矿物均为黄铁矿,次为黄铜矿和方铅矿,脉石矿物主要为石英,其次为绢云母和绿泥石;金矿物以独立矿物形式存在,以裂隙金及粒间金为主,粒度主要集中于0.074~0.010mm 之间,银主要赋存于斑岩型-蚀变岩型金矿石中;矿石的结构构造有利于各矿物的单体解离, 在细磨条件下大部分金矿物易于解离呈单体金,综合回收率93.5%以上。本文研究成果为区域成矿作用的深入认识及选矿流程设计提供了可靠资料。 |
| 英文摘要: |
| Abstract:The Lizi gold deposit in the Tianshui area of Gansu Province can be categorized into two types, i. e. , porphyry and ductile shear zone types. On the basis of detailed field work, we employ analytical techniques of thin sections, artificial heavy sand analysis, chemical phase analysis and electronic probe spectrum analysis to determine that there are two principal types of gold ores, namely altered rock and quartz vein types. Ores from the ductile shear zone type gold deposit are mainly quartz vein type, while ores from porphyry type gold deposit are of the porphyry-altered type. Ores from ductile shear zone have banded, veinlet-stockwork structures, and porphyry ores have disseminated spotted and massive structures. The gold-bearing minerals of these two types are dominated by pyrite with chalcopyrite and galena. Gangue minerals are mainly quartz, next sericite and chlorite. Gold ore is present in an independent mineral form as fissure gold and intergranulaar gold with sizes ranging generally from 0. 074 mm to 0. 010 mm. Silver exists in the minerals of the porphyry-altered rock type. Ore textures and structures facilitate the individual mineral separation, and most of the gold minerals are likely disintegrated to native gold after finely grinding. The overall recovery is more than 93. 5% in this deposit. This research result provides reliable data for further understanding of regional mineralization and design of ore dressing. |
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