云南省大坪金矿床老金山穹隆构造的发现及其地质意义  

Discover of the Laojinshan Dome Structure and Its Geological Significance in the Daping Gold Deposit,Yunnan Province

作　　者：杨喜安 窦世荣 张锦章[2] 陈景河[2] 洪贞群 张宏党 魏密 林耀斌 莫新华[2] 高梦江 

机构地区：[1]东华理工大学放射性地质与勘探技术国防重点学科实验室,江西南昌330013 [2]紫金矿业集团股份有限公司,福建厦门361006 [3]云南省元阳县华西黄金有限公司,云南元阳662406

出　　处：《东华理工大学学报（自然科学版）》2017年第3期201-212,共12页Journal of East China University of Technology(Natural Science)

基　　金：紫金矿业集团股份有限公司资助项目"紫金矿业集团股份有限公司云南省大坪金矿床综合研究"项目(2016001)

摘　　要：大坪金矿床是哀牢山成矿带上的大型金矿床,已有千年开采历史,早期开采主要在老金山矿段。老金山矿段位于大坪金矿床南部,产在志留纪地层中,缓倾正断层控矿。该矿段所在的山峰被称为老金山。老金山位于一向斜中,东翼岩层向南西倾,西翼岩层向南东倾。但是,老金山南坡、中部地层产状南倾,其北部地层北东倾。老金山南部,志留纪中上统青山组和志留纪中上统康廊组呈弧形不整合接触;老金山北部,发育多条放射状、环状断裂。该矿段岩浆活动发育,说明老金山是岩浆上升形成的穹窿构造,老金山矿段控矿断层为该穹隆构造的次级构造。该矿段发育2期隐爆角砾岩和层状高硫化物矿体,是寻找斑岩型矿床的重要找矿标志,老金山矿段隐伏斑岩体向深部矿化蚀变逐渐增强,在大坪金矿床周围有哈播铜钼金矿床、长安冲铜钼矿床和铜厂铜钼矿床等斑岩型矿床。由以上证据,推测老金山矿段深部可能存在斑岩型矿床。The Daping gold deposit is a giant gold deposit along the Ailaoshan metallogenic belt, which has been mined for about one thousand years. Laojinshan ore section of the deposit was mainly mined in earlier years, which is located in the southern Daping gold deposit, hosted by the Silurian, the ores were deposited in pre-exsisting gently normal faults. The Laojinshan ore section lies in the Laojinshan hill of a syncline. However, the stratum of its south slope and its north slope dip southeast and northeast, respectively. In the southern Laojinshan hill, it is uncomfortable contact as arc-shaped between upper-middle Silurian Qingshan suite and upper-middle Si- lurian Kanglang suite; in the northern Laojinshan hill, developed many radial faults and ring faults. Substantial volumes of magmas were emplaced into the Laojinshan hill, imply the Laojinshan hill is a dome structure by as- cending magma, and the l,aojinshan ore section is bordered by substructure of the dome structure. There are two period magmatic hydrothermal breccia, and stratiform pyrite orebody, which is significant indicator for porphyry deposit, hydrothermal alteration and gold mineralization of the buried Laojinshan porphyry body is increasingly strong with deep, along with Habo Cu-Mo-Au deposit, Changanchong Cu-Mo deposit and Tongchang Cu-Mo deposit around the Daping gold deposit. Above state indicates that there is a porphyry deposit underlying the Laojinshan ore section.

关 键 词：大坪金矿床 老金山 穹隆构造 隐爆角砾岩 斑岩体 

分 类 号：P618.51[天文地球—矿床学]