广东省揭西金坑铜锡铅锌矿区矿床地质特征与远景预测

广东省揭西金坑矿区目前已初步查明的（333＋334）级矿石量为2245464.8吨,其中金属量Cu：17596.7吨、Sn：5945.3吨、Pb：31536.9吨、Zn：58095.2吨。矿区主要矿体为脉状,均受滑动破碎构造带控制,总体上可分为两种类型：一类分布于灰白色花岗闪长斑岩中,在空间分布上受滑动破碎构造带控制,矿体顶底板为片理化带,蚀变强,呈脉状、透镜状产于花岗闪长斑岩体内的片理化带所产生的滑动破碎带中。另一类则产于石英片岩、粉砂岩、炭质泥岩层间滑动破碎构造带中,主要由多个连续的或间断的扁豆状、透镜体状的矿脉组成。矿体赋存严格受岩层控制,矿脉与围岩界线清楚。本文旨在通过对矿体特征、成矿机理的深入分析,为矿区为进一步扩大资源量提供理论上的启示。

Geological characteristics and prognosis of prospects of Jinkeng Cu-Sn-Pb-Zn deposit,Jiexi County,Guangdong Province

The preliminarily verified ore reserves of the Jinkeng deposit is 2245464.8 t, including 17596.7 t of Cu-metal, 5945.3 t of Sn-metal, 31536.9 t of Pb-metal and 58095.2 t of Zn- metal. The main ore bodies of the deposit show the form of veins and are controlled by sliding fractured belts and can be divided into two types. The first type is located in a gray granodiorite porphyry and its spatial distribution is controlled by slinding fractured belts, the roof and bottom of ore bodies consist of strong altered schistositise belts, the vein- shaped and lens-shaped ore bodies are distributed in sliding fractured belts occurred in schistositise belts in the granodiorite porphyry. The other type is formed in the interlayer sliding fractured belts among layers of quartz schist, siltstone and carbonaceous mudstone and is mainly composed of a number of continuously or intermittently ranged lenses, the occurrence of ore bodies is strictly controlled by layers of rocks, the boundary line between vein and country rock is distinct. The purpose of this article is to offer a theoretical guid- ance for expanding reserves of the deposit basing on the thorough analysis on characteristics of ore bodies and metallogenic mechanism of the deposit.