【摘 要】
：
The Dongping gold deposit is contained within an inner contacting zone of the Hercynian Shuiquangou alkali syenite. The ores occur as veins or as replacement bo
【机 构】
：
Institute of Geology and Geophysics
【基金项目】
：
中国科学院资助项目;科技部资助项目
论文部分内容阅读
The Dongping gold deposit is contained within an inner contacting zone of the Hercynian Shuiquangou alkali syenite. The ores occur as veins or as replacement bodies. Fluid inclusion observation shows that in early and main mineralizing stages inclusion types are gas and gas-liquid inclusions, respectively. Gas inclusions occur in isolation in vein quartz, their homogenization tem-perature is 372-306℃, and salinity 3.7-1.0 wt% NaCl. Gas-liquid inclusions occur in clusters or healed fractures but do not cut quartz boundary with homogenization temperature 342-267℃ and salinity 1.9-0.8 wt% NaCl. Stable isotope measurements show that at main gold mineralization, hydrogen and oxygen isotopic ratios of the mineralizing fluids are -70.8‰- -108.4‰ and 2.44‰-4.05‰, respectively. Primary ore fluids in Dongping are higher temperature and lower salinity NaCl-CO2-H2O fluids, and come from Yanshanian granitic magmatism. Fluid immiscibility, fluid-rock interactions and meteoric water adding were main reasons for gold deposition.
其他文献
研究了2002年16号台风路径的分析与预报过程,分析了0216号台风在几次关键点的预报过程中出现疑难,预报争议很大的原因.认为类似0216号台风,在其生命史中遇到环境场气压系统比
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
The Tibetan Plateau is a key factor for the pattern of the general circulation of the atmosphere (GCA) in eastern Asia. The pattern of the GCA after the uplift
本文从文化语境所包含的诸多因素出发,分析阐述了如何进行颜色词的英汉翻译,同时也让人们了解了颜色词在英汉两种文化中的不同之处及重要性.
语言与文化之间历来有着密切的联系,它们既相互影响,又相互制约。从广义上讲,文化是指一个社会所具有的独特的信仰、习惯、制度、目标和技术的总模式。中西方不同的文化体系,
The Sr isotopic systematics in the weathering profiles of biotite granite and granite porphyry in southern Jiangxi Province were investigated. The results showe
The concentrations of CH4 in the atmosphere over the past 2000 years have been deduced by extracting and analyzing the air in bubbles embedded in the Dasuopu ic
The Jiaodong Peninsula is the largest repository of gold in China based on the production in history. It covers less than 0.2% of China's territory, but product
The authors of this paper induced five principles of geographical symmetry based on the space distributions of cities and towns in China. There is a symmetry di
邵敬敏先生的《现代汉语通论》是一部适应21世纪需求的采用新思想新框架并且切实好用的大学教材,然而细读之,里面也有许多可以商榷的地方。本文在借鉴学术界各家观点的基础上