富贺钟钨锡多金属矿集区成矿规律及成矿模式

成岩、成矿的时空关系及矿化特征综合研究表明,桂东北富贺钟地区钨锡多金属成矿主要与燕山期姑婆山复式岩体中晚期的细粒花岗岩有关,但成岩与成矿之间存在一定时差。区内矿化具有上锡下钨的垂向分带特征,细粒花岗岩侵入层位的不同制约了矿化类型及成矿元素组合。成矿作用过程中有幔源流体的参与,中泥盆统郁江组砂页岩和东岗岭组灰岩夹白云质灰岩之间的"硅-钙界面"对锡成矿具有重要的控制作用,也是锡矿就位的重要场所。细粒花岗岩体周缘的"硅-钙界面"附近是寻找锡多金属矿的远景地段。

Metallogeney of the Fuchuan-Hezhou-Zhongshan W-Sn-Polymetallic Metallogenic Province

The Huchuan-Hezhou-Zhongshan (conjunction of the Fuchuan County, Hezhou City and Zhongshan County) W-Sn-polymetallic metallogenic province, located in northeastern Guangxi, is an important unit of the Nanling W-Sn-polymetallic metallogenic belt. The characteristics of mineralization and spatiotemporal relationship between the orebodies and intrusions indicate that the W-Sn-polymetallic mineralization is closely related to the late stage fine-grain granite of the Guposhan pluton. However, the minerogenic epoch obviously postdates the magmatic activity, which is distinctly different from the W-Sn deposits in the Nanling metallogenic belt. The metallization pattern and ore metal association of the deposits were controlled by the intrusion depth of the fine-grain granite. The deposits are obviously zonated with Sn mineralization at the upper parts and W mineralization beneath the former. Deep sourced fluids derived from mantle may participate in the ore-forming processes. The siliceous and calcareous interlayers in the sandstone of middle Devonian Yujiang Formation and limestone of Donggangling Formation controlled the Sn mineralization and distribution of the Sn orebodies. The contact zone between the siliceous and calcareous layers and the fine-grain granite is a promising prospecting target for Sn orebody.