滇西北香格里拉东炉房铜钼矿床斑岩-热液成矿特征及找矿预测

东炉房铜钼矿床位于扬子西缘坳陷带,是滇西北香格里拉地区近年新勘查评价的中型矿床,该矿床具大型规模远景。本次通过地质详查及综合研究工作,基本查明了矿床特征,理清了成矿规律,提出了深部及外围找矿预测区。研究认为:铜钼铅锌金多金属矿化与石英闪长玢岩-石英二长斑岩复式侵入岩紧密相关,矿化蚀变具有斑岩型-矽卡岩型-中低温热液脉型成矿系统特征;矿区共圈定24条矿体,其中斑岩型钼(铜)矿体3条,矽卡岩型铜(钼)矿体14条,中低温热液脉型铅锌(金)矿体7条,具有由内到外,由高温至中低温为Mo(Cu)→Cu(Mo)、Fe→Pb、Zn、Au的斑岩成矿系统元素分带特征;结合矿区矿床地质、地球物理、土壤地球化学特征,矿区外围及深部圈定3处寻找斑岩型-矽卡岩型铜钼多金属矿找矿靶区。该矿床的评价对区内寻找同类型矿床具有重要指示意义。

Characteristics of porphyry-hydrothermal mineralization and prospecting prediction of the Donglufang Cu-Mo deposit in the Shangri-La area, northwestern Yunnan Province

The Donglufang Cu-Mo deposit, Shangri-La area, northwestern Yunnan Province is situated in the depression belt of the western margin of the Yangtze platform. The survey and evaluation in recent years suggest that it is of a moderate scale and has a prospect to become a large one. By detailed geological investigations and comprehensive studies, this work has clarified the characteristics and metallogeny of this deposit, and proposed prospecting prediction areas at depth and in the periphery. Research suggests that the mineralization of multiple metals is closely related to quartz diorite porphyrite-quartz monzonite porphyry complex and mineralization alteration has characteristics of a complex porphyry-skarn-hyperthermal vein metallogenic system. In total, twenty-four ore bodies are determined, including 3 porphyry Cu, 14 skarn-type Cu(Mo) and 7 meso-and-low temperature hydrothermal vein Pb-Zn(Mo) orebodies, which are featured by element zoning, where from inner to outer and from high temperature to intermediate-low temperature are transitions from Mo(Cu) to Cu (Mo) and from Fe to Pb, Zn and Au. Coupled with geological and geophysical conditions as well as soil geochemical characterization, 3 target zones are proposed for exploitation of the porphyry-skarn type Cu(Mo) deposits in the periphery and deep subsurface of the mining area. The evaluation of this deposit holds great significance to prospecting of Cu (Mo) deposits of the same type in the region.