哀牢山浅变质岩带红土型金矿的地质特征和成矿机理

哀牢山浅变质岩带分布于哀牢山深大断裂与九甲-安定深大断裂之间的古生界与中生界地层中,哀牢山金矿带目前已发现的主要金矿床(点)均产于其中,金矿类型以蚀变岩型和石英脉型为主,但近年来,相继发现了一批红土型金矿.哀牢山浅变质岩带基岩的含金丰度值高,新生代以来构造活动异常强烈,而地壳抬升保持相对平稳,亚热带气候温暖潮湿,在地形平缓的山间盆地、低山、丘陵、准平原、喀斯特地貌单元中红色粘土富集,是红土型金矿成矿的有利地区.岩带南段相对于北段红土型金矿成矿条件更加有利,找矿更有远景.

GEOLOGICAL FEATURES AND ORE-FORMING MECHANISM OF LATERITIC GOLD DEPOSITS IN AILAOSHAN EPI-METAMORPHIC ROCK BELT, YUNAN PROVINCE

Ailaoshan epi -metamorphic rock belt is distributed in Paleozoic and Mesozoic strata between Ailaoshan and Jiujia- Anding deep faults. Discovered gold deposits in the Ailaoshan gold belt are mainly located in the rock belt. Gold types mainly include altered rock and quartz vein styles. Recently, a batch of latcritic gold deposits had been also found in the beh. Gold contents in basement rocks of Ailaoshan epimetamorphic rock belt are higher. As intensive tectonic activities since Cenozoic, relative stability of crustal elevation, and subtropical warm and moisture climate, red clays are enriched in intermountain basins with smooth relief, low mountains, hills, peneplane and karst morphologic units, forming favourable ore - forming zones for lateritie type gold deposits. Ore -forming, contlitions and ore prospecting in the south part of the Ailaoshan epi - metamorphic rock belt are better than that in the north part.