铜陵冬瓜山矿床深部斑岩型矿化特征及其与矽卡岩型矿化的关系  

Characteristics of porphyry mineralization in the depth of Dongguashan deposit and its relationship with skarn-type mineralization

作　　者：袁峰[1] 宋玉龙[1] 王世伟[1] 周涛发[1] 孙维安 

机构地区：[1]合肥工业大学资源与环境工程学院,合肥230009

出　　处：《地质科学》2014年第2期588-607,共20页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金项目(编号:41320104003;41172086;40830426);国家"深部探测技术与实验研究专项计划"专题(编号:SinoProbe-03-02-05);中国地质调查局地质调查工作项目(编号:1212011121115;1212011220243);新世纪优秀人才支持计划项目(编号:NCET-10-0324)资助

摘　　要：冬瓜山铜矿床是铜陵矿集区狮子山矿田中的主要矿床,对于该矿床中斑岩型成矿作用的研究缺乏。本文对冬瓜山矿床深部是否存在斑岩型矿体、斑岩型矿化特征及其与层状矽卡岩型矿化的关系等问题开展研究。冬瓜山矿床深部具有斑岩型矿化的蚀变类型和蚀变分带特征,矿化可分为钾硅酸盐阶段和石英硫化物阶段两个成矿阶段;斑岩型蚀变分带在空间上向外与矽卡岩化带过渡。斑岩型矿化的石英闪长岩形成年龄为140Ma,与上部层状矽卡岩型矿化相关的石英/辉石二长闪长岩应为同期闪长质岩浆形成。深部斑岩型矿化的成矿流体具有由高温向中温演化的特点,与浅部层状矽卡岩型矿化的成矿流体具有相似的演化趋势;二者的成矿流体应该为一个热液系统,深部岩体内部流体演化形成斑岩型矿化,而接触带部位流体演化形成矽卡岩型矿化。The Dongguashan copper ore deposit is the dominant deposit of Shizishan ore field in Tongling area. Little research for porphyry mineralization has been done in the deposit. In this paper, we have carried out some research in the depth of deposit including porphyry mineralization features and its relation with layered skarn type mineralization. It is obvious that some kinds of alteration and alteration zoning characteristics have been discovered, mineralization can be divided into two metallogenic stages including potassium stage and quartz sulfide stage, there is a transitional space between porphyry alteration zonation and skarnization. The U-Pb age for porphyry mineralization-related quartz diorite is 140 Ma, and together with quartz （pyroxene） monzodiorite forming in the Same period due to the evolution of diorite magma. Ore-forming fluid evolution from porphyry mineralization is from high temperature to the medium temperature, which is similar to the evolution tendency of upper layered skarn mineralization. It is illustrated that both of the ore-forming fluid should be a whole hydrothermal system with porphyry mineralization due to internal fluid evolution and occurring skarnization mineralization in the contact zone.

关 键 词：斑岩 矽卡岩 成矿流体 冬瓜山矿床 铜陵 

分 类 号：P618.510.5[天文地球—矿床学]