甘肃大水二长岩类特征、结晶条件与侵位深度

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基金项目:

国土资源部"九五"科技攻关课题(编号:95-02-002-02)

CHARACTERISTICS,CRYSTALLIZATION CONDITIONS AND EMPLACEMENT DEPTHS OF QUARTZ MONZONITES FROM DASHUI AREA,GANSU PROVINCE

1. Institute of Geomechanics, GAGS, Beijing 100081, China;
2. No.3 Geological Party, Gansu Bureau of Geology and Mineral Resources, Gansu Hezuo 747000, China

摘要: 对大水地区(石英)二长岩类的岩石学研究表明,忠格扎拉、忠曲和格尔括合岩体及周围的脉岩是同源岩浆演化的产物。尽管它们结晶的温度条件相似(约700℃~800℃),但侵位深度有明显的差别,西部忠格扎拉岩体最深(20km~22km),中部忠曲岩体次之(16km),东部格尔括合岩体最浅(8km~11km),并且后二者具有次火山岩的性质。这说明浅成岩浆对金矿的形成最为有利,这就是为什么在格尔括合和忠曲岩体附近形成了大型金矿床,而在忠格扎拉岩体周围仅找到金矿点的主要原因。
- (石英)二长岩 /
- 侵位深度 /
- 金矿 /
- 大水地区
Abstract: Study of petrology of quartz monzonites from Dashui area suggests that the Zhonggezhala,Zhongqu and Ge'erkuohe bodies are derived from a comagmatic region.Although their crystallization temperature of about 700℃~800℃ is exactly alike,the emplacement depth among them is very different,from 20km~22km of Zhonggezhala through 16km of Zhongqu to 8km~11km of Ge'erkuohe towards the east.Moreover,the later two bodies show a signature of subvolcanic rock.This implies that hypabyssal magma is beneficial to the gold mineralization in the Dashui area.This is why the large-scale gold deposit was defined in the vicinity of Ge'erkuohe and Zhongqu bodies,but only ore spot was found nearby Zhonggezhala body.
- quartz monzonite /
- emplacement depth /
- gold deposit /
- Dashui area