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。
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 largescale gold deposit was defined in the vicinity of Ge′erkuohe and Zhongqu bodies,but only ore spot was found nearby Zhonggezhala body.
出处
《地质力学学报》
CSCD
2003年第1期62-69,共8页
Journal of Geomechanics
基金
国土资源部"九五"科技攻关课题(编号:95 02 002 02)
