摘要
云南西北部格咱岛弧是西南"三江"古特提斯阶段形成的重要地质构造单元,位于扬子西缘义敦岛弧带的南端。近年来新发现了包括普朗超大型斑岩型铜矿,红山—红牛、雪鸡坪大型和10余个中小型斑岩-夕卡岩型铜矿床,成为斑岩型铜矿田和铜资源勘查开发基地。研究发现,矿田中矿床的形成与大地构造演化密切对应,不同阶段发育不同的矿床;对应于构造演化产生的区域北西向主干断裂控制岩带的展布,次级断裂及褶皱联合控制了岩体的形态和产状,斑岩型矿床主要产于背斜核部,其含矿斑岩侵位较浅,夕卡岩型铜矿主要产于向斜核部,含矿斑岩侵位相对较深;含矿斑岩多为复式岩体,顶部往往有火山岩岩盖,表明火山岩浆活动具有继承性的特征,普朗铜矿产于北西、北东东向两组断裂的交汇部位,形成岩体内斑岩铜(钼)矿、接触带夕卡岩铜矿和围岩中的大脉状铜矿"三位一体"的斑岩成矿系统,并在外带发育铅锌矿和浅成低温热液金(银)矿床。
Geza arc is an important geological tectonic unit which formed in the Paleotethyan stage of the ＂Sanjiang＂ area in northwestern Yunnan. It is located in the southern tip of Yidun island-arc in the western margin of the Yangtze craton. In recent years, a series of deposits were newly found there, including the Pulang super-large sized copper deposit, Hongshan- Hongniu large sized copper deposit, Xuejiping large sized copper deposit, and more than 10 small and medium sized porphyry-skarn copper deposits, which constituted a porphyry copper orefield and a copper resources exploration and development base. The research found that the formation of ore deposits closely corresponded to the tectonic evolution, and different deposits were formed in different developmental stages. The regional NW-trending main faults corresponding to the tectonic evolution controlled the rock belts distribution, and the secondary faults and fold controlled morphology and occurrence of the rock mass. Porphyry deposit is mainly distributed in the core of the anticline and the emplacement depth of mineralized porphyry is shallow; skarn copper deposit was mainly produced in the core of the syncline and the emplacement depth of the porphyry was relatively deep. Most mineralized porphyries were composite pluton and often had a volcanic rock cover on the top of the composite pluton, which indicated that volcanic magmatic activity had the inherited characteristics. The formation of the Pulang super-large sized porphyry copper deposit was strictly controlled by the intersection of NW trending structure and NEE structure, it formed a ＂trinity＂ porphyry mineralization system which included porphyry copper deposit inside rock mass, skarn copper deposit of the contact zone and the large vein copper ore bodies in surrounding rocks, and also include the lead-zinc deposit and epithermal gold （silver） deposit in the outer contact zone.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2015年第4期53-66,共14页
Earth Science Frontiers
基金
云南省科技领军人才培养计划项目(2013HA001)
云南省香格里县格咱地区铜多金属矿整装勘查区关键基础地质研究项目(12120114013701)
中国博士后科学基金项目(2014M552547XB)
关键词
斑岩铜矿
矿田构造
控岩控矿作用
普朗
格咱岛弧
云南
porphyry copper deposit
orefield structure
rock and ore controlling role
Pulang orefield
Geza arc
Yunnan
