基于短波红外技术的蚀变矿物特征及勘查模型——以斯弄多银铅锌矿床为例  

Characteristics of alteration minerals and prospecting model revealed by shortwave infrared technique:Take Sinongduo Ag-Pb-Zn deposit as an example

作　　者：郭娜[1] 刘栋[1] 唐菊兴[2] 郑龙[1] 黄一入 史维鑫[3] 伏媛[1] 唐楠[1] 王成[1] GUO Na;LIU Dong;TANG JuXing;ZHENG Long;HUANG YiRu;SHI WeiXin;FU Yuan;TANG Nan;WANG Cheng(Chengdu University of Technology,Chengdu 610059,Sichuan,China;Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;Cores and Samples Center of Land and Resources,China Geological Survey,Sanhe 065201,Hebei,China)

机构地区：[1]成都理工大学,四川成都610059 [2]中国地质科学院矿产资源研究所,北京100037 [3]国土资源实物地质资料中心,河北三河065201

出　　处：《矿床地质》2018年第3期556-570,共15页Mineral Deposits

基　　金：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)共同资助

摘　　要：印度-亚洲大陆的碰撞成就了青藏高原的冈底斯成矿带,位于该成矿带的斯弄多银铅锌矿床赋存于林子宗群火山岩中,经过勘查确认该矿床属于低硫化浅成低温热液型矿床。通过对5个钻孔进行短波红外测量,发现钻孔中的蚀变矿物主要有绢(白)云母、钠云母(富Na云母)、伊利石和蒙脱石,并在垂向形成绢(白)云母→绢(白)云母+钠云母+蒙脱石+伊利石→绢(白)云母+伊利石→绢(白)云母的组合特征。通过总结归纳蚀变矿物分布、分带特征并与地质编录相结合,构建了基于短波红外技术的斯弄多找矿勘查模型。笔者在数据分析与模型构建中发现:(1)伊利石-蒙脱石混合矿物组成是寻找深部及外围矿体的重要线索;(2)绢(白)云母属于成矿前期的蚀变,与矿体之间的关系不明显;(3)矿床深部表现为两种不同的化学反应:SW方向深部反映了绢云母被交代形成伊利石的过程;NE方向深部表现为绢(白)云母二八面体结构的变化;(4)未被剥蚀的青磐岩化带是寻找浅成低温热液型金矿的主要依据。The India-Asia continental collision formed Gangdise metallogenic belt in the Tibetan Plateau,and the Sinongduo deposit lies on this belt and exists in volcanic rocks of Linzizong Group.Geologists confirmed this as an epithermal deposit based on prospecting and drilling.Alteration minerals of muscovite,paragonite,illite and montmorillonite were found in drill holes BZK0501,BZK0102,BZK0103,BQZK0022,BZK0201 by shortwave infrared technique.Meanwhile,the above minerals formed a combination feature in order of muscovite→muscovite ＋ paragonite＋ montmorillonite ＋ illite→muscovite ＋ illite→muscovite in downward succession in drill holes.In combination with the distribution of minerals and geological logging,the authors constructed a prospecting model based on shortwave infrared technique.Some conclusions have been reached according to the model：（1） Mineral combination of illite-montomorillonite is an important clue to the further prospecting;（2） The alteration of muscovite happened before the metallogenic epoch and had no relationship with the orebody;（3） There exist two reactions in the depth of drill holes.One is that the muscovite was replaced by illite in SW direction,the other is that the texture of the muscovite is changed in NE direction;（4） Propylitization zone which has not not been eroded is the basis for gold prospecting.

关 键 词：地质学 短波红外技术 蚀变矿物 找矿模型 斯弄多银铅锌矿床 西藏 

分 类 号：P618.52[天文地球—矿床学] P618.42[天文地球—地质学]