高硫-低硫化浅成低温热液矿床的短波红外矿物分带特征及找矿模型——以西藏铁格隆南(荣那矿段)、斯弄多矿床为例
投稿时间:2017-04-17  修订日期:2017-07-10  点此下载全文
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作者单位E-mail
郭娜 成都理工大学 cdut_guona@126.com 
基金项目:国土资源部公益性行业科研专项(编号: 201511017-4),国家自然科学青年基金(编号:41302265)
中文摘要:本文以铁格隆南(荣那矿段)高硫化浅成低温热液矿床和斯弄多低硫化浅成低温热液矿床为研究对象,运用短波红外技术快速厘定了上述两个矿床的蚀变矿物类型及组合特征,构建了基于短波红外勘查技术的找矿模型。研究发现:铁格隆南矿床(荣那矿段)的蚀变矿物垂向分带组合为:高岭石→高岭石+(地开石+明矾石)→高岭石+明矾石+(地开石)→高岭石+地开石+明矾石。受底部斑岩型矿体的叠加作用,上部还有少量交代残余的白(绢)云母;斯弄多低硫化浅成低温热液矿床的蚀变矿物垂向分布为:白(绢)云母+(钠云母)→白(绢)云母+钠云母+(伊利石)→白(绢)云母+钠云母+蒙脱石+伊利石→白(绢)云母+钠白云母+蒙脱石+伊利石,其中顶部白(绢)云母是后期黑云母花岗斑岩蚀变所产生,本身与成矿无关;矿体主要赋存在伊利石+蒙脱石带,随着蒙脱石被伊利石化,矿体也逐渐尖灭。
中文关键词:浅成低温热液型矿床 短波红外技术 蚀变分带 找矿模型 蚀变矿物
 
Alteration zoning and prospecting model of epithermal deposit, as revealed by shortwave infrared technique—— a case study of Tiegelongnan and Sinongduo
Abstract:The article gets Tiegelongnan (the Rong ore section) high sulfidation epithermal deposit and low sulfidation epithermal deposit as the research object, based on the shortwave infrared technology fast determined the two deposit alteration and mineral assemblages, built a shortwave infrared prospecting model. The study found that Tiegelongnan deposit (Rongna) of alteration minerals with vertical zoning combination: kaolinite → kaolinite + (dickite + alunite)→ kaolinite + alunite + (dickite)→ kaolinite + alunite + dickite. Meanwhile some metasomatic relict white mica be left in drill holes because of the superimposition of porphyry type orebodies at the bottom. Sinongduo deposit minerals showed the vertical distribution with muscovite+ (paragonite)→ muscovite+ paragonite +(illite) →muscovite+ paragonite + illite→muscovite+ paragonite + illite + montmorillonite. The top White mica is produced by the alteration of the late biotite granite porphyry. It has nothing to do with mineralization. The ore body is mainly hosted in the illite + montmorillonite belt, and the orebody is gradually wiped out as the montmorillonite is petrified by Illite.
keywords:epithermal deposit  shortwave infrared technique  alteration zoning  prospecting model  alteration minerals
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