武夷山成矿带南段桃溪环形区成矿规律和找矿方向

桃溪环形区是武夷山成矿带南段一个重要的矿集区,目前已探明的主要矿床有紫金山铜金矿、岩背锡矿和红山铜矿等大型矿床,它们是武夷山成矿带、乃至中国东部的典型矿床。本文从几个主要矿床的成矿物质来源、岩浆与成矿的关系、蚀变、矿床成因和成矿模式等方面,总结了桃溪环形区中生代与火山相关的铜多金属矿的区域成矿规律,并在综合分析前人地质找矿工作成果基础上,提出火山坳陷区边部斑岩发育区或火山机构发育区为桃溪环形区铜多金属矿的找矿远景区。

Metallogenic regularity and ore-prospecting orientation of the Taoxi circular area

Abstract: With more than 50 deposits and favorable ore-forming conditions, the Taoxi circular area is an ore concentration area for copper and polymetallic deposits. The deposits and geochemical anomaly as well as geophysical field show circular shape, and the main metallogenic and ore-controlling factors for the deposits in the area are a favorite assemblage of metallogenic and ore-controlling structures as well as the magmatic rocks of Mesozoic magmatic activity in the late Yanshanian period; all these phenomena are also the important prospecting criteria. The main kind of the deposits is porphyry or magmatic hydrotermal type. The circular places are the targets of further copper and polymetallic ore exploration, and particularly more attention should be paid to the volcanic craters or well-developed porphyry areas or ore spots situated in the volcanic depression.