摘要
改造强度是形成中国绿岩带及变质细碎屑岩系中大型及超大型金矿床的关键条件。以超大型金矿床的形成作用作为讨论对象，并对一些特大型金矿床形成超大规模的前景进行了评估。该类矿床产在变质岩及晚期侵入体中，矿床经历了沉积、区域变质及成矿等多次形成作用，有的还经历了重熔岩浆作用阶段，但矿床最终为改造作用所形成。控制超大型矿床成矿的改造作用强度主要反映在被活化的矿源岩石规模大并有多种来源、成矿流体规模大且具较强氧化性、流体长期多次活动以及有稳定的热源等。决定改造强度的因素为多级构造组成的连网。玲珑超大型金矿床是改造强度巨大的产物，形成金山及河台等矿床的改造强度也很巨大，因此有发展成为超大规模的潜力。
Intensity of reworking is a key factor for formation of large and superlarge gold deposits ingreenstone belts and metamorphosed microclastic rocks of China. However, this paper onlyfocuses on the formative conditions of superlarge gold deposits and evaluating potential for somelarge gold deposits to be superlarge scale. Discussed gold deposits occur in metamorphic rocksand later intrusive masses. Gold was concentrated successively by sedimentary, regionallymetamorphic and partly remelted magmatic processes. Gold deposits were finally formed byreworking mineralization. The key factor for formation of superlarge gold deposits is intensity ofreworking, i. e. great mobilized dimension of auriferous source rocks and multiple source, greatamount of much oxidized ore-forming fluid, long-term and multiperiodic activity of fluid andstable heat source. Intensity of reworking depends upon the favorable connected nets consistingof several directional fractures. This research shows that Linglong superlarge gold deposit is theproduct of great intensity of reworking and Jinshan and Hetai deposits are potential to besuperlarge gold deposits.
出处
《地球化学》
CAS
CSCD
北大核心
1999年第6期551-561,共11页
Geochimica
基金
原国家科委攀登计划!PDA-30
关键词
超大型
金矿床
绿岩带
变质细碎屑岩系
矿床成矿
superlarge gold deposit
greenstone belt
metamorphosed microclastic rock
intensity of reworking
tectonically connected net
mineral deposit geochemistry
