桂西隆林地区隆或金矿构造控矿模型及成矿预测.

The adjacent area of Yunnan, Guizhou, and Guangxi provinces, termed the “Golden Triangle”, is one of the world-famous Carlin-type gold ore concentration areas. Previous metallogenic research in this area mainly focuses on the mineralization at the edge of the carbonate platform. However, it rarely involves the interior of the carbonate platform, so the ore body emplacement factors and ore-controlling models are still unclear within the platform. The Longhuo gold deposit, a typical gold deposit located at the platform’s interior in the western Guangxi, was analyzed in detail; the ore-controlling structure and model were fundamentally constructed. The results show that the structures of Longhuo gold deposit can be divided into three periods. (1) The first period is Hercynian sedimentary, which forms the NE-trending F0 syngenetic fault and the platform-trench paleogeographic pattern with the thin-layer siliceous rock-mudstone-siltstone components; the lithology provides the stratigraphic conditions for the formation of the deposit. (2) The second period is Indosinian orogenic, which forms the Longhuo dome and NW-trending Mohao secondary anticline; the anticline provides favorable tectonic conditions for the mineralization. (3) The third period is Yanshan metallogenic characterized by the reactivation of fault F0, which is the main hydrothermal fluid migration channel in the mine area. A large number of parallel secondary normal faults and associated traction folds develop on its western side, and gradually weaken into joints and cleavage zones to the west. These secondary fault-joint-cleavage zones together form the ore-allocating tectonic system of the mine area, guiding the ore-forming fluids to replace and filling the siliciclastic-carbonaceous mudstones and tuffs of Lower Carboniferous Yingtang Formation in Mohao secondary anticline core to form bedded ore bodies. Therefore, the Longhuo gold ore body is jointly controlled by lithology and tectonics. According to the metallogenic model, combined with geophysics-geochemistry-remote sensing data, it is predicted that near the western side of the NE-trending fault F0, the secondary anticline core of the deep part of Longhuo gold deposit is the favorable prospecting target. The ore-bearing stratum is Lower Carboniferous Yingtang Formation. The intersection of fault F0 and the core of Longhuo dome is the favorable prospecting target for mineralization in the periphery of Lower Devonian Yujiang Formation, especially near the unconformity in contact with Cambrian. [ABSTRACT FROM AUTHOR]