湖南香花岭锡多金属矿田成矿地质背景与找矿潜力评估

ANALYSIS ON GEOLOGICAL BACKGROUND OF METALLIZATION AND ASSESSMENT ON POTENTIAL ORE-RESOURCES IN XIANGHUALING OREFIELD, HUNAN

成矿预测区成矿地质背景有利程度的研究是提高预测标志与预测结果之间因果关系的有效途径。本文通过对构成香花岭锡多金属矿田成矿地质背景的主要因素——构造与花岗岩浆性质及配置关系的研究认为,虽然矿田位于区域成矿的有利地带,但由于矿田成矿地质背景所具有的“三多一小”特征制约了矿田内形成Sn、Pb、Zn、W呈较大规模矿床的能力,从而降低了矿田内成矿预测的期望水平和找矿潜力。

Studying the favorable degree of geological background of metallization for a prospecting field is a effective path trying to enhance the causality between the forecasting marks and the results. The main factors of the geological-background system of metallization in Xianghualing Sn-polymetallic orefield- the characters of structural activity and granitic magma intrusion and their disposal are researched in this paper. We consider , although the field is located in the suitable ore-forming belt regionally, that 'three many and one small' feature (e. g. too many metallic elements and metallogenic types, too amny times of the granitic magma intrusive and too many the subsidiary fractures but small-scale metallic deposits ) of the geological background of metallization in the field restricts the possibility forming large-scale Sn, Pb, Zn, W deposits and reduces the expectation value for metallogenic prognosis and the potential ore-resources in the orefield.