Hydrothermal alteration and associated mineralization in the Freda-Rebecca gold deposit – Bindura District, Zimbabwe

被引：0

作者：

D. D. Klemm

H. G. Kräutner

机构：

[1] LMU,

[2] Institut für Allgemeine und Angewandte Geologie,undefined

[3] Luisenstr. 37,undefined

[4] D-80333 München,undefined

[5] Germany e-mail: dietrich.klemm@iaag.geo.uni-muenchen.de,undefined

[6] Isarstr. 2E,undefined

[7] D-83026 Rosenheim,undefined

[8] Germany e-mail: hg.kraeutner@t-online.de,undefined

来源：

Mineralium Deposita | 2000年 / 35卷

关键词：

Calcite; Pyrite; Shear Zone; Gold Deposit; Tourmaline;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The Freda-Rebecca Mine is currently the largest gold producer in Zimbabwe. The ore deposit is hosted by two main shear systems crosscutting the Rebecca diorite and Bindura granodiorite (2.65 Ga) as well as Shamvaian metasediments, which are affected by contact metamorphism. Following the intrusion of the Bindura granodiorite, intensive hydrothermal alteration developed preferentially in the dioritic part of the igneous complex (Rebecca diorite). The hydrothermal alteration started with an extensive K-dominated hydrothermal metasomatism in the whole Rebecca diorite. It was followed by less penetrative hydrothermal alteration developed preferentially near shear zones and veinlets. Hydrothermal metasomatism caused microcline and biotite formation, prevailing in the Rebecca diorite. Two main stages of post-metasomatic hydrothermal alteration and mineralization were distinguished, based on spatial relationships between different minerals and some geochemical aspects. In the first stage, an actinolite-tourmaline-arsenopyrite mineralization formed, which is characterized by Ni-Co arsenopyrite associated with actinolite, tourmaline and quartz. The second, lower temperature stage gave a polyphase gold-rich mineralization that developed in four phases which are distinguished by different parageneses including:

引用

页码：90 / 108

页数：18