摘要
磨坊沟式金矿是指鲁西铜石地区赋存在早寒武世朱砂洞组灰质白云岩和白云质灰岩中的碲金矿床,近期地质勘查表明,矿体产出层位相对稳定,分布面积较广,矿化较为连续,具有很大的资源潜力和找矿远景。其围岩具明显的黄铁绢英岩化、高岭土化、方解石化和萤石化。碲金矿的形成与黄铁绢英岩化密切相关。矿床产出的构造部位为鲁西幔枝构造核部,铜石隆起外围太古宙结晶基底与寒武纪盖层间主拆离带之上的次级拆离带中。成矿物质来自深源(地幔),矿体就位受主、次级拆离滑脱带控制。由于次级拆离带断坪顺层展布,故矿体亦表现出似层状特征。
Mofanggou style gold deposits refer to gold telluride deposits occurring in calcareous dolomite and dolomitic limestone in the Early Cambrian Zhushadong Formation in the Tongshi area,western Shandong. According to recent geological exploration, the horizon of the orebodies is relatively persistent and widespread, with relatively continuous mineralization. Deposits of this style have great resource potential and ore prospects. The notable wall-rock alteration types include pyritization-sericitization-silification,kaolinization, calcitization and fluoritization. The formation of gold telluride deposits is closely related to pyritization-sericitization-silification. The favorable structural sites for forming this style of deposit are the core region of the western Shandong mantle branch and secondary detachment zones above the main detachment zone between the Archean crystalline basement and Cambrian covers surrounding the Tongshi uplift. Ore-forming materials were derived from a deep source (the mantle) and the emplacement of orebodies is controlled by the main and secondary detachment zones. As the secondary detachment zones are distributed parallelly to bedding, the orebodies show the stratiform feature.
出处
《中国地质》
CAS
CSCD
2005年第3期447-451,共5页
Geology in China
基金
国家自然科学基金项目(40272088)
中国地质调查局地质大调查项目(200110200038)资助。
关键词
幔枝构造
地幔热柱
碲金矿床
成矿作用
控矿构造
鲁西铜石
mantle branch
mantle plume
gold telluride deposit
mineralization
ore-controlling structures
Tongshi, westernShandong