云南永胜–祥云富碱斑岩带铜钼矿成矿模式及找矿方向

Metallogenic Model and Prospecting Prediction of Copper-Molybdenum Deposit in Yongsheng-Xiangyun Alkali-Rich Porphyry Belt, Yunnan Province

摘要: 永胜–祥云富碱斑岩带位于东特提斯构造域藏东–滇西“三江”地区，金沙江–哀牢山富碱火成岩带中段。带内不仅岩浆活动频繁，且铜钼多金属成矿作用强烈，发育有斑岩型、矽卡岩型、角岩型以及热液脉型矿化。本文以中国地质调查局等《勘查区找矿预测理论与方法》为指导，针对永胜–祥云富碱斑岩典型铜钼矿床开展“成矿地质体、成矿构造、成矿作用特征标志”三位一体找矿预测研究工作，厘定出四类成矿地质体及成矿系列，提出三级控矿构造及其控矿规律，结合矿床时空分布规律，建立永胜–祥云富碱斑岩带多金属矿床成矿模式。在此基础上，圈定出宾川小龙潭东侧小坝田、弥渡朵谷–小纪罗、宾川多白、永胜鲁地拉、洱源小干海及宁蒗纸房沟六个找矿预测区。本次研究工作为该类矿床成矿理论与找矿预测提供参考。

Abstract: The Yongsheng-Xiangyun alkali-rich porphyry belt is located in the middle part of the Jinshajiang-Ailaoshan alkali-rich igneous rock belt in the “Sanjiang” area of East Tian-West Yunnan in the East Tethys tectonic domain. The zone not only has frequent magmatic activity, but also has strong copper-molybdenum polymetallic mineralization, with porphyry, skarn, hornfels and hydrothermal vein mineralization. In this paper, guided by the Theory and Method of Prospecting and Prediction in Exploration Areas of China Geological Survey. The research on “metallogenic geologic body, metallogenic structure and metallogenic characteristics” of typical alkali-rich porphyry copper-molybdenum deposit in Yongsheng-Xiangyun has been carried out. Four types of ore-forming geological bodies and ore-forming series are determined, three-level ore-controlling structures and ore-controlling rules are put forward, and the ore-forming model of Yongsheng-Xiangyun alkali-rich porphyry belt is established in combination with the temporal and spatial distribution of ore deposits. On this basis, six prospecting prediction areas, namely Xiaobatian, Miduduogu-Xiaogiluo, Binchuan Duobai, Yongsheng Ludila, Eryuan Xiaoqianhai and Ninglang Zhifanggou to the east of Xiaolongtan, Binchuan, are delineated. This research work provides reference for the metallogenic theory and prospecting prediction of this kind of deposit.