Characteristics of Fluid Inclusions and Mineralization of the Dehelongwa Copper (Gold) Deposit, pace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />place w:st="on">Qinghai pe w:st="on">Provincepe>place>

详细信息   

• 责任者：Cao Yonghua (Key Laboratory of Metallogenic Prediction of Nonferrous Metals ; Ministry of Education ; School of Geosciences and Info-Physics ; Central-South University ; Changsha 410083 ; China) ; Lai Jianqing
• 刊名：Earth Science Frontiers
• 出版年：2011
• 卷期：18(5)
• 关键词：铜矿 ; copper ores ; 金矿 ; gold ores ; 流体包裹体 ; fluid inclusions ; 青海 ; Qinghai Province
• 页码：p.147-158
• 图表：6 illus., 2 tables, 24 refs.
• 分类号：1001
• issnNo：ISSN1005-2321
• isbnNo：CN11-3370/P

摘要

<P style="MARGIN: 0cm 0cm 0pt" class=MsoNormal>The Dehelongwa copper (gold) deposit, located in the north-east part of Qinghai-Tibetan Plateau, is a magmatic hydrothermal deposit. Three types of inclusions hosted in quartz are found in the ore-bodies, i.e., liquid-rich two-phased aqueous inclusions (type-), vapor-rich aqueous inclusions (type-Ⅱ), and aqueous inclusions with daughter mineral(s) (type- Ⅲ). Based on the fluid inclusion data, three types of ore-forming fluids are deduced, they are strongly overpressured and high salinity magmatic hydrothermal fluid A, medium-high salinity boiling hydrothermal fluid B, and low-medium salinity fluid C. It is suggested that ore-forming elements were transported by high salinity magmatic fluids, with Cu mainly as chlorocomplex such as CuCl₂(aq) and CuCl^- and Au mainly as sulfur-arsenic complex. The ore-forming components were precipitated due to boiling and fluid mixing as well as the decrease in salinity, temperature, and pressure of the fluids.pt" lang=EN-US>pace prefix = o ns = "urn:schemas-microsoft-com:office:office" />p>p>