关键词: 多龙矿集区, 金矿, 成矿规律, 找矿标志

Abstract: The Naruo large copper（gold）deposit is an important porphyry deposit in the northern part of the Duolong ore concentration area in Xizang. It is located in the north of the western section of the Bangong Lake-Nujiang suture zone. The regional tectonic evolution is complex and the metallogenic condi⁃ tions are superior. However，the fine metallogenic regularity and genetic mechanism of the deposit still need to be systematically determined. In this paper，the deposit is taken as the research object，and the geological characteristics，ore-controlling factors and metallogenic regularity of the deposit are systemati⁃ cally studied through field geological survey，fine anatomy of ore body and ore characteristics and indoor comprehensive analysis. The results show that the deposit was formed in the continental margin arc tectonic environment of the northward subduction of the Neo-Tethys Ocean. The diagenesis and mineralization were controlled by the early Cretaceous intermediate-acid magmatic activity，and the main metallogenic age was about 120 Ma. The ore-bearing rock mass is a multi-stage emplacement of hypabyssal-ultra hypabyssal granodiorite porphyry. The ore body occurs in the porphyry body and the altered sandstone in the outer con⁃ tact zone. The main ore body is vertical tubular，the middle is thick and rich，and the edge is thin and de⁃pleted. The mineralization is strictly controlled by the fracture structure inside and outside the rock mass， and the metal minerals are mainly chalcopyrite and pyrite. From the center of the rock mass to the outside， the potassium zone，phyllic zone，propylitic zone and hornfels zone are developed in turn，which has the characteristics of typical porphyry deposit ring alteration，and is a porphyry-epithermal low-temperature hydrothermal composite deposit. The distribution of ore bodies in the mining area is controlled by the com⁃ bination of structure，magma and alteration. The NE-trending fault is the main ore-controlling structure， and the ring alteration，surface mineralization，and geophysical and geochemical anomalies are typical prospecting indicators. The ore body in the eastern part of the mining area is dislocated by NW-trending faults，and the concealed ore body in the hanging wall has good prospecting potential. The research system clarifies the metallogenic regularity and prospecting criteria of the deposit，which can provide theoretical reference for the follow-up exploration of the mining area and the prospecting work of similar deposits in the region.

Key words: Duolong ore concentrated area, gold deposit, metallogenic regularity, prospecting criteria