摘要
斯弄多银铅锌矿床是冈底斯成矿带发现的首个低硫化浅成低温热液矿床。本文采用短波红外技术对矿区进行了精细蚀变矿物分带划分,并结合岩石地球化学测量对不同蚀变带元素的迁移机制进行了系统分析,构建了斯弄多矿区的短波红外勘查模型。研究发现:(1) Al-OH波长值的无序排列变化说明斯弄多矿床中存在不同岩浆热液流体的混合作用;(2)不同矿物组合形成了明显的蚀变分带,垂向上(由内向外)形成了绢云母化带→绢云母-钠云母-蒙脱石带→绢云母-伊利石-蒙脱石带→绢云母-伊利石带;(3)隐爆角砾岩型矿体中成矿元素Ag-Pb-Zn具有明显的分带性,其中,Ag主要赋存在绢云母-伊利石带,Pb-Zn则主要赋存在绢云母-伊利石-蒙脱石带;(4)热液脉型Ag-Pb-Zn矿体品位与伊利石结晶度指数IC关系密切,矿体主要赋存于0. 6≤IC≤1. 2的范畴;(5)以钻孔BZK0301(3号勘探线)为界,斯弄多矿床成矿性优劣存在一条明显界线,NE向由于不同流体的混合作用成矿性较好,SW向因为流体较为单一成矿性差。
The Sinongduo silver lead-zinc deposit is the first low-sulfide epithermal deposit found in the Gangdis metallogenic belt. In this paper, the investigation of the fine altered mineral zonation of the ore area was carried out by using shortwave infrared techniques. The migration mechanism of elements in different alteration zones is systematically analyzed in combination with geochemical survey, and the prospecting and exploration model of the Sinongduo is constructed. The following conclusions can be obtained based on our studying:(1) The formation of the Sinongduo deposit is originated from the mixture of different magmatic hydrothermal fluids;(2) The deposit was formed during the magmatic hydrothermal period, and the different mineral assemblages formed in obvious altered zoning. From top to bottom, it formed sericite→sericite+paragnite+montmorillonite→sericite+illite+montmorillonite→sericite+illite;(3) The ore forming elements of Ag, Pb and Zn have obvious zoning characteristics in cryptoexplosive breccia orebody, among which Ag is in sericite-illite belt, and Pb-Zn are mainly occur in sericite-illite-montmorillonite belt;(4) The distribution of the hydrothermal vein orebody is related to the IC value of illite, which coexist in the extent of 0.6 to 1.2 of IC value;(5) Taking the drill hole BZK0301(No.3 prospecting line) as a boundary, the mineralization of the northeastern region to this boundary is better than that of the southwestern region due to the mixed action of different fluids in this area, while the latter is relatively single in fluid and poor in mineralization.
作者
郭娜
郭文铂
刘栋
黄一入
郑龙
郭亚楠
GUO Na;GUO WenBo;LIU Dong;HUANG YiRu;ZHENG Long;GUO YaNan(Chengdu University of Technology , Chengdu 610059 , China)
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2019年第3期833-848,共16页
Acta Petrologica Sinica
基金
国家重点研发计划(2018YFC0604105)
国土资源部公益性行业科研专项(201511017-4)
国家自然科学青年基金项目(41302265)联合资助
