鄂东南铜、铁矿床地质-地球物理-地球化学勘查模式

A GEOLOGICAL-GEOPHYSICAL-GEOCHEMICAL EXPLORATION MODEL OF COPPER-IRON DEPOSITS IN SOUTHEASTERN HUBEI

本文是在鄂东南地区以铜为主的多金属矿床的实际资料基础上,按矿床类型归纳,分别建立了铁山式铁-铜矿床,铜绿山式铜-铁矿床,叶花香式铜矿床,鸡冠嘴式铜-金矿床和铜山口式铜(钼)矿床等典型矿床的地质-地球物理-地球化学勘查摸式。这些模式系统地总结了该区铜矿床的成矿地质条件,地球物理和地球化学特征,并以图示的形式表现出来,对该区今后的铜矿床研究及矿产预测、找矿方法的选择和就矿找矿等方面有一定的现实意义。

Southeastern Hubei abounds in polymetallic copper deposits. Based on actual data of typical polymetallic copper in the area and an integrated analysis of the metalio-genic geological conditions and geophysical and geochemical characteristics, the author has established a geological-geophysical-geochemical exploration model of Tieshan-type Fe-Cu deposits, Tonglushan-type Cu-Fe deposits, Yehuaxiang-type Cu deposits, Ji-guanzui-type Cu-Au deposits and Tongshankou-type Cu (Mo) deposits. 1. The deposits are closely related to alkali-rich acid-intermediate rocks intruded in the early Yans-hanian and carbonate rocks of Carboniferous to Triassic age, the main mode of metallization was contact metasomatism, the ore materials mainly came from nearby mag-matic rocks, the ore bodies are controlled by the tectonic the fracture system superposed on the contact belt, and the deposits in a broad sense belong to the skarn type. 2. The geophysical features are marked by those of a contact belt, i.e. the gravity and magnetic transition belt; the ore bodies correspond to certain gravity and magnetic anomalies (the anomalies may be strong or weak because of differences in types of mineral deposit, ore mineral and burial depth of ore body) and low-resistance anomalies. 3. The primary geochemical anomalies are well developed, and their intensity is highest along the ore-controlling fracture lines; the ore front indicator elements are As,Pb,Ba,Sb (Hg,F), the near-ore indicator elements are Cu, Au, Ag, Bi, Zn and the ore-rear indicator elements are W,Co (Fe, Ni, Mo). In a word, the model summarizes systemmatically the metallogenic geological conditions and geophysical and geochemical characteristics which are graphically expressed. This model has important practical significance for studying copper deposits predicting mineral resources, choosing methods of prospecting and looking for ore deposits on the basis of existing ore deposits in the area.