遥感蚀变异常信息对斑岩型铜矿床的有效性——以云南宝兴厂斑岩型铜钼矿床为例  

The Effectiveness of Alteration Anomalies from Remote Sensing to Porphyry Copper Deposits:A Case Study of the Baoxingchang Porphyry Copper-Molybdenum Deposit in Yunnan Province

作　　者：温利刚 赵志芳[2,3] 曾普胜[1,4] 史青云[2,3] 闫洁茹 叶蓓[1,2,3] 

机构地区：[1]中国地质大学(北京),北京100083 [2]云南大学资源环境与地球科学学院,云南昆明650091 [3]云南大学遥感地质研究中心,云南昆明650091 [4]国家地质实验测试中心,北京100037

出　　处：《地质与勘探》2017年第3期547-557,共11页Geology and Exploration

基　　金：中国地质调查局项目(DD20160220);中国地质调查局项目(12120113095400;12120113002500);中国地质科学院基本科研业务费项目(YYWF201619);国家自然科学基金项目(41072073);国土资源部公益性行业科研专项(201211078)联合资助

摘　　要：云南宝兴厂铜钼矿床是西南三江成矿带上与富碱斑岩有关的典型斑岩型矿床,产出于金沙江-哀牢山富碱侵入岩带的中部东侧。本文引用基于"广义自相似性"与"局部奇异性"多重分形理论的S-A法,提取了宝兴厂铜钼矿床的石英、钾长石、绢云母、绿泥石和绿帘石等特征蚀变矿物的遥感蚀变异常信息,这些蚀变异常信息由内向外依次出现石英(钾长石)→绢云母→绿帘石(绿泥石)的分布特征,并且多沿北东、北西向展布,呈条带状或环带状分布于侵入岩体的内部或外围附近,与传统经典的硅化(钾化)带→绢英岩化带→青磐岩化带的蚀变分带模式大致相当,但这些遥感蚀变异常信息并不完全出现在出露的侵入体的接触带及其两侧。野外实地验证表明此次获得的遥感蚀变异常信息有较好的矿化指示效果,可以为该地区斑岩型铜钼矿床的进一步找矿提供一定的指导。The Baoxingchang Cu -Mo deposit is one of the typical alkali -rich porphyry -type deposits in the Sanjiang metallogenic belt of south- western China, which is located in the east - central part of the Jinshajiang - Ailaoshan alkali - rich intrusive rock belt. This work took the Baoxingchang area as the study objective, using the S -A method, based on the ＂multifraetal generalized self- similarity＂ and ＂local singularity＂ theories, to distin- guish and extract the alteration information from remote sensing data. It involves quartz, K -feldspar, sericite, epidote and chlorite. The alteration infor- mation can be divided into three zones, from the inner to outer which arc quartz （K -feldspar） , scricite and epidote （chlorite） , mostly occur within the intrusive bodies （including granite porphyry, monzonite porphyry, syenite porphyry and so on） and are distributed along the interface between the bodies and wall rocks, or around the rock bodies, trending in NE and NW directions as bandings and annulus. The alteration zone is roughly consistent with the typical alteration zoning, which consists of silicification - potassium alteration, silicification - sericitization and propylitization zones from the inside to the outside, but not completely exposed in the contacting zone of the outcropped intrusive rocks and adjoining rocks and either side. Field tests show that the alteration anomalies from remote sensing indicate the mineralization is vel＂y well, which can provide some guidance for the further prospecting of Cu -Mo deposits in the Baoxingchang area.

关 键 词：斑岩型铜(钼)矿床 蚀变矿物 遥感蚀变异常信息 S-A法 宝兴厂 云南 

分 类 号：P618.41[天文地球—矿床学] P627[天文地球—地质学]