多不杂斑岩铜金矿区蚀变分带与黄铁矿的关系——物探方法选择与异常解释的基础  

The relationship of the alteration zonation in the Duobuza porphyry coppergold deposit with pyrite——The foundation of geophysical method selection and anomaly interpretation

作　　者：焦彦杰[1] 廖国忠[1] 李华[1] 张伟[1] 李富[1] 杨俊波[1] 

机构地区：[1]中国地质调查局成都地质调查中心,四川成都610081

出　　处：《中国地质》2015年第6期1969-1979,共11页Geology in China

基　　金：国家重点基础研究发展计划"973计划"(2011CB403105);中国地质调查局地质调查项目(1212011502701;12120114050701)联合资助

摘　　要：西藏多不杂斑岩铜金矿是近年来新发现的一个矿床,位于班公湖—怒江成矿带西段。多不杂矿床由内向外发育钾化、绢英岩化、青磐岩化,钾化主要发育于花岗闪长斑岩出露区域,绢英岩化环绕钾化带发育,并叠加在钾化带之上,青磐岩化在矿床西侧呈团块状发育。本文阐述了钻孔中Cu品位趋势线与多不杂矿床有序分带的关系,进一步说明了钾化带与矿体存在密切对应关系。通过黄铁矿分布趋势与实际矿体对比分析,以及岩石地球物理性质研究,得出含矿花岗闪长斑岩体为中高电阻率、极化率的初步结论,然后在典型矿床进行方法试验和地球化学数据处理,根据推断结果和实际矿体位置,认为矿体主要赋存于中浅部中高电阻率、极化率及磁场梯级带、Cu-As-Sb-Au高背景区域,进一步完善了方法选择,为多不杂斑岩型矿床预测研究提供了基础。The Duobuza porphyry copper deposit was discovered in recent years in Tibet. It is located in the western part of the Bangong Co- Nujiang River metallogenic belt. From the interior to the outer part of this deposit, there exists zoning of potassic alternation, phyllic alteration and propylitization. Potassic alternation is mainly developed in the granodiorite porphyry outcropping area, sericitization is developed surrounding the potassic alteration zone and superimposed upon the potassic alteration zone, and propylitization occurs in lamps on the western side of the deposit. This paper expounds the relationship between the grade tendency line of Cu in the drill hole and the orderly zoning in the Duobuza deposit, and further demonstrates that the potassic alteration zoneand the orebody have a close corresponding relationship. Based on the pyrite distribution trend and the actual ore comparative analysis as well as the study of rock geophysical properties the authors reached the preliminary conclusion that the ore- bearing granite diorite porphyry is characterized by high resistivity and polarizability. On such a basis, method test and geochemical data processing were conducted in typical deposits. According to the inferred results and actual orebody position, it is held that the orebody mainly occurs in the high resistivity, high polarizability and magnetic field gradient zone, whereas Cu- As- Sb- Au high background area is located in the shallow part. The results obtained by the authors further improve the method choice and provide the basis for the prognostic work in the Duobuza porphyry deposit.

关 键 词：多不杂 斑岩铜矿 蚀变 黄铁矿 

分 类 号：P618.41[天文地球—矿床学] P618.51[天文地球—地质学]