The geology of the platinoid deposits assocated with mafic intrusive rocks on the southwestern margin of the Yangtze platform, southwestern China
-
摘要: 传统型铂族矿产,系指与镁铁质岩浆成矿作用有关的铂族矿产资源。华力西运动时期,扬子地台西南缘沿超壳深断裂带发生的大陆裂谷作用,为来自上地幔的镁铁质(拉斑玄武岩质)岩浆的上涌和侵位提供了极为有利的前提条件。含铂基性超基性岩的时空分布,受到大陆裂谷作用的主要发生发展时期和裂谷活动带的控制。通过对典型矿床特征及其成矿作用的探讨,论述了扬子地台西南缘主要的铂族矿床类型;并从四维成矿的角度,阐述了对区域成矿规律的一些基本认识。Abstract: The traditional platinoid mineral resources are referred to as the platinoid mineral resources associated with the mineralization of mafic magmas. The continental rifting during the Variscan orogeny within the supercrustal deep-seated fault zones on the southwestern margin of the Yangtze platform, southwestern China was (responsible) for the upwelling and emplacement of the mafic (tholeiitic) magmas from the upper mantle. The (platinum)-(bearing) basic and ultrabasic intrusive complexes are thus believed to be the products originated from the tholeiitic magmatic differentiation in the supercrustal (deep)-(seated) fault zones and continental rifts during extensional stages, and consist dominantly of the following types:peridotite type, olivine (pyroxenite)-(gabbro) type, (peridotite)-(pyroxenite)-(gabbro) type, olivine (pyroxenite)-(pyroxenite)-(gabbro)-(syenite) type, (peridotite)-(olivine) (pyroxenite)-(pyroxenite) type. The spatial distribution of the platinum deposits is apparently constrained by the (deep)-(seated) faults. Main mineralization types of the platinoid deposits in the study area include the late magmatic (segregation)-(liquation)-(hydrothermal) and (segregation)-(hydrothermal) types.
-
计量
- 文章访问数: 87
- HTML全文浏览量: 0
- PDF下载量: 76
下载:
