Genesis of the Navachab Gold Deposit, Namibia

纳米比亚纳瓦查布金矿的成因

• 批准号: 23528250
• 负责人: Professor Dr. Franz Michael Meyer
• 金额: --
• 依托单位: Institut für Geologie, Mineralogie und Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/23528250?language=en
• 关键词: Genesis; Navachab; Gold; Deposit; Namibia

The Navachab gold deposit in the Southern Central Zone of the Damara Orogen, Namibia, is situated within marbles, calc-silicate rocks and metapelitic schists of the Damara sequence. The mine is currently the only known lode-gold deposit in the extensive system of Pan-African orogenic belts in southern Africa. The deposit has experienced multiple episodes of high-T fluid-rock interaction during compressive deformation, that resulted in the formation of massive ¿replacement style¿ ore bodies, as well as several generations of quartz-sulfide veins. This study will examine the stable isotope and geochemical effects of superimposed fluid-rock interaction in this sediment-hosted lode-gold deposit. An isotopic tracer study on a continuous section from the unaltered host rocks through one of the ore bodies and representative quartz-sulphide veins will be undertaken in order to quantify the isotopic exchange between the ore-forming fluids and carbonaceous host rocks. In combination with fluid inclusion work (including in-situ chemical analyses of the fluid content), the results will provide new insights into the controls on hydrothermal fluid compositions, and the dynamics of this metamorphic (and magmatic?) hydrothermal system in a typical high-T, low-P metamorphic terrain.

纳米比亚Damara造山基因中部南部中部地区的Navachab黄金沉积物位于大理石中，计算硅酸盐岩石和Damara序列的Metapelitic片岩。该矿山目前是南部非洲泛非造山带广泛系统中唯一已知的矿床。该沉积物在压缩变形过程中经历了多次高-T流体岩石相互作用的发作，这导致形成了大规模的替换样式矿体，以及几代石英硫化物静脉。这项研究将检查在这种沉积物托管的Lode-gold沉积物中叠加的流体岩石相互作用的稳定同位素和地球化学作用。为了量化矿石形成液体和碳质宿主岩之间的同位素交换，将进行一项从未改变的宿主岩石的连续截面上的同位素示踪剂研究。结合流体纳入工作（包括流体含量的原位化学分析），结果将为水热流体组成的控制提供新的见解，以及在典型的高-T-P低-P，低P变质地形中，这种变质（和Magmatic？）水热系统的动态。