Abstract
The Yangchuling porphyry W-Mo deposit is a new-type tungsten deposit discovered recently in southern China. Being of certain economic significance, this type of deposits promises some new prospects for the availability of increasing tungsten resource. The ore-bearing rock mass, intermediate to acid in composition, is a composite rock body resulting from comagmatic, multiple-stage intrusion during Middle-Late Yenshanian Period. Spatially, the rock mass is controlled by the Guangji—Anqing—Nanjing deep fault. As a typical porphyry deposit, the ore-bearing rocks (granodiorite porphyry, mozonitic granite porphyry and camouflage breccia) belong to sub-volcanic facies characteristic of near-surface environment. The rocks have suffered strong hydrothermal alteration which is closely related to mineralization. The deposit is classified as meso-epithermal deposit and our study shows that W and Mo come from the granodiorite, granodiorite porphyry and mozonitic granodiorite porphyry, which are believed to be derived through remelting from some W-rick basement rocks contaminated with minor amounts of upper mantle materials.
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