科研之友
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摘要
The Guposhan-Huashan batholith is located in the western segment of the Nanling Range Granitic Belt. The batholith is made of multiple intrusive units emplaced in the Early Yanshanian of Mesozoic Era. The batholith includes the Guposhan pluton in the east and the Huashan pluton in the west. Both plutons are similar in size and shape and composed of similar ore-forming granites. The plutons show concentric zonation with contrasting emplacement mode. The Guposhan pluton was built in an outward incremental growth mode. Its earliest intrusive unit, the more mafic and less resistant (to weathering and erosion) Lisong intrusive unit with lower chemical energy, is located in the central part and surrounded by the younger, more felsic and resistant Wanggao and Xinlu intrusive units with higher chemical energy. Accordingly, the differential weathering and erosion resulted in a depression or a basin in the center which is surrounded by high, steep-sloped mountains. As such, the inward radial drainage pattern led to the formation of placer and residual ore deposits in the basin and in the Lisong River valley. In contrast, the Huashan pluton was built in an inward incremental growth mode with the younger Wanggao and Xinlu units in the central area. Therefore, the more felsic and resistant Wanggao and Xinlu granites form high mountains surrounded by low hills of the Lisong unit. The resulting drainage pattern is an outward radial pattern. Exploration in the past years has led to the discoveries of a number of large- and small-scale tin placer and weathering-type rare earth ore deposits in basins and river valleys around the periphery of the pluton.
