现代地质2017，Vol.31Issue(4)：672-682,11.
甘肃省沃尔给花岗岩体中黑云母的成分对其岩体碱度的响应及成岩成矿意义
Chemical Composition of Biotites Responding to Basicity of Woergei Granite Intrusion in Gansu Province and Implications for Petrogenesis and Mineralization
摘要
Abstract
The formation of ore deposits and the geological genesis of metallogenic rock mass are closely related to the chemical characteristics of rocks.In this paper,we centred on the investigation of relationship between the alkalinity and mineralization.The sampling and measurement of the chemical compositions of biotite,from Woergei granite intrusion in Gansu Province are carried on,and the biotite data from fifty-two kinds of different deposits in China are collected.By analyzing the basicity of host rocks,we regard that the existed metallogenic granite intrusion bearing Cu and Au were located in the high basicity area.The granite intrusion was almost related to the formation of Sn ore deposits belong to the low alkalinity rock.From the early to late period of magmatic melt transformation process,the oxygen fugacity changed from high to low and medium alkalinity increased.The formation of Cu and Au deposits was also followed by the process of diagenetic mineralization.However,the low oxygen fugacity and the high basicity are advantageous to the activation and migration of element Sn in early magmatic crystallization process.The high oxygen fugacity and the lower alkalinity are advantageous to the precipitation of cassiterite in magmatic hydrothermal-fluid stage.The precipitation of cassiterite constantly consumed oxygen,leading to a significant decrease of the higher oxygen fugacity than before.The interaction of the ox-ygen fugacity and the basicity caused mineralization.关键词
黑云母/成因/碱度/氧逸度/沃尔给花岗岩体/甘肃省Key words
biotite/genesis/basicity/oxygen fugacity/Woergei granite intrusion/Gansu Province分类
天文与地球科学引用本文复制引用
杜佰松,申俊峰,秦玉良,刘海明,刘圣强,徐立为,牛刚,欧阳尔彪..甘肃省沃尔给花岗岩体中黑云母的成分对其岩体碱度的响应及成岩成矿意义[J].现代地质,2017,31(4):672-682,11.基金项目
国家自然科学基金项目(41072070). （41072070）
