摘要
伊利石广泛存在于铜厂大型斑岩铜矿床内,是特征的热液蚀变矿物,其结晶度(IC)和膨胀层含量受携带矿质的热液流体量控制。以浸染状强矿化为特征的斑岩体中上部及接触带附近伊利石结晶程度较好,主要是高水/岩比作用的结果。同时指示出伊利石结晶程度好的部位,矿化品位高,蚀变程度也强。在低水/岩比、流体量小的深部斑岩体内,伊利石结晶度(IC)则主要受温度、时间控制。
Illite is a kind of altered mineral within the hydrothermal alteration zone, including the altered granodiorite-porphyry and the altered metamorphic tuffaceous phyllitic near contact zone with porphyry rock body at Dexing porphyry copper deposit orefield. The illitic crystallinity value (IC) and expansibility are mainly affected by water/rock ratio or fluid influx. It was formed by illitization of plagioclase and micas during hydrothermal fluid evolution within the porphyry body and near contact zone with wall rocks. Moreover, the positive correlation between illitic index and copper grade indicates that, within the porphyry body and near contact zone with wall rocks, the higher the illitic crystallinity value is, the stronger the alteration degree is, and the higher the copper grade is. At lower portion of porphyry body, however, the illitic crystallinity vaule is mainly controlled by temperature and time.
出处
《矿物岩石》
CAS
CSCD
北大核心
1999年第4期5-9,共5页
Mineralogy and Petrology
基金
国家自然科学基金!(编号49733120
49873026)
