| 肖波.冈底斯驱龙斑岩铜-钼矿区外围矽卡岩型
铜矿的分布、特征及深部找矿意义[J].地质与勘探,2011,47(1):43-53 |
| 冈底斯驱龙斑岩铜-钼矿区外围矽卡岩型
铜矿的分布、特征及深部找矿意义 |
| Distributions and Characters of Zhibula-Langmujiaguo Skarn Cu DepositsEnvironing the Qulong Porphyry Cu-Mo Deposit and Their Implicationsfor Ore-Search Towards the Deep Subsurface |
| 投稿时间：2010-09-18 修订日期：2010-11-06 |
| DOI： |
| 中文关键词: 斑岩成矿系统 驱龙斑岩Cu-Mo 矿 知不拉-朗姆家果矽卡岩Cu 矿床 冈底斯 |
| 英文关键词: Porphyry copper system, Qulong porphyry Cu-Mo deposit, Zhibula-Langmujiaguo skarn Cu deposits, Central Gangdese belt, southern
Tibet |
| 基金项目:本文受国家自然科学基金项目(40772066)、西藏巨龙铜业有限公司和国家十一五科技支撑计划冈底斯成矿课题编号
(2006BA01A04)的联合资助 |
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| 中文摘要: |
| [摘要]世界范围内,巨型斑岩型矿床外围通常发育有同时代且具有成因联系的矽卡岩-脉状金
属矿床;二者往往互为找矿标志,共同组成斑岩成矿系统。形成于印度-欧亚大陆后碰撞背景,与中新世
adakitic 质侵入岩有关的冈底斯斑岩Cu-Mo 矿床成矿带已成我国重要的矿产基地。位于冈底斯中段的
驱龙巨型斑岩Cu-Mo 矿床(>1000Mt Cu)是我国目前最大的铜矿床,在其外围南部及东南部,分布着知
不拉、朗姆家果两个矽卡岩型Cu 矿;矽卡岩及矿体走向近东西,向北陡倾,矿体深部向驱龙斑岩矿床延
伸。成矿时代上,知不拉与驱龙完全一致;同时知不拉与朗姆家果具有极其相似的矿床地质特征、矽卡
岩矿物组成和矿化类型,硫化物组合均为黄铜矿、黄铁矿、斑铜矿和辉铜矿;矽卡岩中的石榴石主要是具
有韵律生长环带的钙铁榴石(Ca3 Fe2 Si3 O12 )为主,少量的钙铝榴石(Ca3 Al2 Si3 O12 );从矽卡岩的产状推断
二者可能相连成一体。最新的钻探揭示在朗姆家果矽卡岩矿床的深部出现驱龙斑岩矿床中的花岗闪长
岩和黑云母二长花岗岩,表明它们是同一期岩浆-成矿作用的产物。在冈底斯带上斑岩型矿床外围有利
区域寻找矽卡岩型矿床将极大的拓展找矿思路和空间。 |
| 英文摘要: |
| Abstract:Giant porphyry Cu systems host the most widely distributed mineralization types at convergent plate boundaries, including porphyry deposits
centered on intrusions, skarn and superjacent high- and intermediate-sulfidation epithermal deposits. While the giant Miocene Qulong porphyry Cu-Mo
deposit, which formed in the Gangdese post-collision orogenic belt of southern Tibet, now, is thought to be the largest porphyry-type deposit in China,
and with confirmed Cu ~ 10Mt and Mo ~0. 5Mt, at least. Two contemporary skarn Cu deposits are located adjacently, the Zhibula and Langmujiaguo
sharn deposits. The skarn deposits share exactly similar geological, mineralogical features: garnets with obvious oscillatory growth zoning are mainly andra鄄
dite (Ca3 Fe2 Si3 O12 ) and minor grossularite (Ca3 Al2 Si3 O12 );sulfides are chalcopyrite, pyrite, bornite, and chalcocite. These skarn deposits have obvi鄄
ous close temporal and spatial relations to the Qulong porphyry deposit, and the recent exploration work at the Langmujiaguo skarn deposit found that the
same Miocene granodiorite and biotite monozogranite in the Qulong porphyry deposit were intruded under the skarks. So the porphyry deposit and the skarn
deposits might result from the same ore-forming system. The features of porphyry Cu systems and the closely adjacent skarn deposits need to be taken into
account during planning and exploration. |
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