甘肃金山矿区金矿床控矿因素及成因探讨  

Ore-controlling Factors and Genesis of Jinshan Gold Deposit in Gansu

作　　者：袁兴伟 

机构地区：[1]甘肃有色白银矿产勘查院,甘肃白银730900

出　　处：《甘肃冶金》2016年第3期48-51,共4页Gansu Metallurgy

摘　　要：金山矿区位于礼岷金矿带西段,中川和碌础坝两大花岗岩体之间,产于中川岩体外接触带1~3.5 km范围之内。成矿主要受岩体、地层、构造控制,岩体是成矿的最主要因素,印支-燕山期的岩浆活动为矿床的形成提供了充足的热源;成矿物质来源是多元的,岩体在侵位过程中,熔融了地壳岩,同化了围岩,融虑、吸附了地层中的有用组分是矿床成矿物质重要来源之一;构造运动、岩浆活运所产生的断裂为岩浆后期形成的含矿气水溶液运移和富集提供了条件;粉砂质绢云母千枚岩,钙质、粉砂质绢云母千枚岩,绿泥绢云千枚岩是成矿的主要矿源层;矿体的形成是多期多阶段的,形成微细粒浸染型、石英脉型矿体;矿床成因属近程的中低温岩浆热液型矿床。Jinshan gold mine is settled between Zhongchuan and Luchu granites in the west part of Limin gold mineraliza- tion belt. It is formed at the external contact zone, 1- 3.5 km away from the Zhongchuan pluton. The ore bodies are con- trolled together by magmatic rocks, wall rocks and structures, while the Zhongchuan granite is the key factor. The Indosini- an-Yanshanian period magmatic activities provide enough heat for the mineralization. Ore-forming matter sources are multi- variate. Silty serieite phyllite, calcium sericite phyllite, chlorite sericite phyllite are the main source beds of ore-forming metals. During the magma intrusion, the melt assimilated the surrounding rocks and absorbed the useful components. Then, the tectonic fractures made the movement and enrichment of metal-beating fluid possible. The ore bodies are formed in mul- tiple periods and stages. The deposit is of mierogranular disseminated type and belongs to short-range low temperature mag- marie hydrothermal type deposit.

关 键 词：金山矿区 控矿因素 物质来源 多期多阶段 

分 类 号：P618.51[天文地球—矿床学] P611[天文地球—地质学]