滇西保山地块北端温泉断裂构造–岩浆带成矿系统以及铍矿化特征初探——以泸水县石缸河锡钨铍矿床为例  

The Tectono-Magmatic Metallogenic System of Wenquan Fault Zone in the Northern End of Baoshan Massif, Western Yunnan, and the Characteristics of Beryllium Mineralization—A Case Study of the Shiconghe Tin-Tungsten-Beryllium Deposit in Lushui

作　　者：张金学 徐恒 姜永果 罗洪昌 

机构地区：[1]云南省有色地质局三一〇队,云南 大理 [2]云南省有色地质局,云南 昆明

出　　处：《地球科学前沿（汉斯）》2021年第6期729-746,共18页Advances in Geosciences

摘　　要：复合造山和叠加转换共同导致了三江特提斯域复杂的构造岩浆活动和复合成矿系统,构造动力体制转换是成矿的根本驱动。温泉断裂是研究区内的主要导岩、导矿构造,区内成矿系统以斑岩–矽卡岩型Cu-Fe-Pb-Zn和云英岩型Sn、W矿床为主,成矿与燕山晚期中特提斯洋的关闭以及新特提斯洋的俯冲消减引发的酸性岩浆期后热液系统关系密切,形成于后碰撞陆内伸展构造环境。研究认为温泉断裂构造–岩浆带内岩浆热液型Sn-W-Be成矿系统与矽卡岩型/岩浆热液型Fe-Pb-Zn-Cu-Ag-Hg多金属成矿系统属于相同构造岩浆热事件在不同标高和不同围岩环境的成矿响应,为复合成矿作用的产物。通过复合成矿系研究探索构建了温泉断裂构造–岩浆带成矿模式,认为进一步探寻燕山晚期–喜山期花岗岩体是后续找矿的关建环节,与酸性岩有关的Pb、Zn、Sn、W、Be多金属成矿系列是区内的重点找矿方向;研究显示石缸河锡钨铍矿床的铍矿化在空间上依附于海西期蚀变辉长辉绿岩脉(307.9 ±3.2 Ma),但成矿年龄集中在68~56 Ma,与燕山晚期酸性岩浆期后热液关系密切,提出石缸河以北的外岩房一带是寻找铍矿资源的首选靶区;温泉断裂北东侧的松坡、光山、中和一带,以及温泉断裂南西侧核桃坪一带其深部具有寻找与晚期酸性岩体相关的钨铍矿的找矿远景。Complex Orogeny and superimposed transformation together lead to complex tectono-magmatic activities and complex metallogenic systems in Tethys, Tam Giang. Wenquan fault is the main rock-guiding and ore-guiding structure in the study area. The metallogenic system is dominated by porphyry-sicarn type Cu-Fe-Pb-Zn and Yunbolite type Sn-w deposits, the mineralization is closely related to the post-acidic Magmatic hydrothermal system triggered by the closure of the middle Tethys Ocean in the late Yan Mountains and the subduction of the new Tethys Ocean, and formed in the post-collision intracontinental extensional tectonic environment. It is considered that the magmatic hydrothermal Sn-W-Be metallogenic system in the Wenquan fault-magmatic Belt and the sicarn/magmatic hydrothermal Fe-Pb-Zn-Ag-Hg polymetallic metallogenic system belong to the same tectono-magmatic thermal events at different levels and in different surrounding rock environments, it is the product of composite mineralization. The metallogenic model of Wenquan fault structure-magmatic belt is constructed through the study of composite metallogenic series. It is considered that further exploration of Late Yanshan-Himalayan granitoids is the key link of subsequent ore prospecting, and Pb, Zn, Sn, W, Be polymetallicmetallogenic series related to acid rocks is the key ore prospecting direction in the area. The study shows that the beryllium mineralization of the Shi-guanghe tin-tungsten-beryllium deposit is spatially attached to the Hercynian altered Gabbro di-abase vein (307.9 ±3.2 Ma), but the ore-forming ages are concentrated at 68~56 Ma, which is closely related to the post-acid Magmatic Hydrothermal System of the late Yan Mountains, it is suggested that the outer Yanfang area north of Shikong river is the preferred target for beryllium mineral resources, and the Songpo, Guangshan and Zhonghe areas on the east side of the hot spring fault, the deep part of Hetaoping area on the south-west side of Wenquan Fault have the prospect of searching for tung

关 键 词：铍矿化特征 成矿系统 温泉断裂构造–岩浆带 保山地块 

分 类 号：P61[天文地球—矿床学]