U.S.-China Cooperative Research (Geol.): Geochemical Studiesof the Massive Sulfide Gold Deposits of the Tongling District, Anhui, China

关于"块状硫化物金的地球化学研究"的建议 中国安徽省铜陵地区的沉积物， James R.博士弗吉尼亚理工大学的克雷格和罗伯特·J·博德纳尔 研究所和州立大学以及林根藩和万鑫先生 中国地质勘探局华东地质勘探公司 冶金工业部（MMI），联合主办， NSF和中国MMI。 这项联合研究的目的是进行详细的地质调查， 一个主要但鲜为人知的成矿区的矿床 位于中国东部中部，安徽省铜陵地区。 这 区内含有大量矽卡岩和层控块状 含有可开采或潜在可开采的硫化物矿床 大量的贱金属和黄金，特别是铜金矽卡岩 矿床、层控铜金矿和铁帽金矿 存款 调查人员试图确定 并确定这两种不同的 存款类型是有成因联系的。 为了实现这一点，详细 矿石和脉石的岩相学和电子探针分析 矿物将定义矿物学和矿物化学， 矿床，并寻求建立一个全面的共生 顺序 同时，详细的输液研究， 包括标准的显微测温法和激光拉曼分析， 确定矿化的成分和物理状态 流体. 本文对不同类型的金矿床进行了研究， 地质背景和明显的成因提供了一个机会， 发现新的方面的地球化学运输和沉积 黄金 具体来说，对这些矿床的研究可以提供 关于含金演化的宝贵信息 热液系统，通过探索矿床之间的关系， 显然与岩浆活动有关，比如矽卡岩， 和那些完全在沉积物中的（层控的 矿床），空间上与侵入体无关。 新 这项研究对金矿成因的深入了解可能会导致 新的勘探战略和技术， 美国和中国。

This proposal on "Geochemical Studies of the Massive Sulfide Gold Deposits of the Tongling District, Anhui Province, China," between Drs. James R. Craig and Robert J. Bodnar of the Virginia Polytechnic Institute and State University and Messrs. LIN Gen Fan and WAN Xin of the East China Geological Exploration Company of the Chinese Ministry of Metallurgical Industry (MMI), is jointly sponsored by NSF and by the Chinese MMI. This joint research aims at a detailed geological investigation into the ore deposits of a major, but little known, metallogenic province in east central China, the Tongling area of Anhui province. This area contains a large number of skarn and stratabound massive sulfide deposits that contain mineable or potentially mineable quantities of base metals and gold, specifically copper gold skarn deposits, stratabound copper gold deposits, and gossan gold deposits. The investigators seek to define the conditions under which these deposits formed and to determine if the two different deposit types are genetically related. To achieve this, detailed petrographic and electron microprobe analyses of ore and gangue minerals will define the mineralogy and mineral chemistry within the deposits and seek to establish a comprehensive paragenetic sequence. At the same time, detailed fluid infusion studies, including standard microthermometry and laser Raman analyses, will define the composition and physical state of the mineralizing fluids. This study of gold deposits in distinctly different geological settings and apparent genesis provides an opportunity to discover new aspects of the geochemical transport and deposition of gold. Specifically, study of these ore deposits may provide valuable information about the evolution of gold bearing hydrothermal systems, by exploring the relationship between deposits that are clearly related to igneous activity, such as the skarns, and those that are hosted entirely in sediments (the stratabound deposits) and spatially unrelated to an intrusive body. The new insight into gold ore genesis promised by this research could lead to new exploration strategies and techniques useful both in the United States and in China.