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新寮岽铜多金属矿是近年来在粤东地区新发现的一个铜矿床,在该矿区绿泥石化十分强烈,并与铜矿化关系密切。按照矿物共生组合关系,矿区绿泥石可分为与硫化物共(伴)生及未与硫化物共(伴)生呈单独产出两类,两类绿泥石主要呈叶片状、纤维状、蠕虫集合体状等形态产出。本文在岩矿鉴定的基础上,以矿区绿泥石为研究对象,利用电子探针技术,对其微区化学成分进行了研究。结果表明:随着孔深的增加,与矿化有关绿泥石的Si和Mg元素含量逐渐升高,Al、Fe、Mn元素含量逐渐降低,而与矿化无关的绿泥石成分变化规律不明显。两类绿泥石主要为富铁种属的蠕绿泥石、铁镁绿泥石;绿泥石为泥质岩或者铁镁质岩受热液交代蚀变的产物,绿泥石结构的离子置换主要体现为Fe对Mg的置换,反映其可能形成于富铁及相对酸性环境;由绿泥石地质温度计估算得出两类绿泥石形成温度为166.32~245.62℃,平均为219.15℃,且与硫化物共(伴)生的绿泥石的形成温度相对较高,但两者均属中-低温范围。绿泥石的形成机制主要表现为溶蚀-结晶和溶蚀-迁移-沉淀结晶2种。
The Xinliao copper polymetallic deposit is a newly discovered copper deposit in eastern Guangdong in recent years, where chlorite is very strong and closely related to copper mineralization. According to the symbiosis of mineral assemblages, the chlorite in the mining area can be divided into two types: co-associated with sulfide and non-co-associated with sulfide. The two types of chlorite are mainly leaf-like and fibrous , Worm aggregates and other forms of output. Based on the identification of rock and mine, this paper takes the chlorite in the mining area as the research object, and uses the electronic probe technology to study its chemical composition in the micro-zone. The results show that with the increase of the hole depth, the content of Si and Mg in the chlorite related to mineralization gradually increases while the content of Al, Fe and Mn decreases gradually. However, the variation of chlorite components unrelated to mineralization does not change obvious. The two types of chlorite are mainly vermiculite and fernsite of iron-rich species. Chlorite is the product of alteration alteration of pyroxene or mafic rocks by hydrothermal fluids. The chlorite-structured ions The substitution mainly reflects the substitution of Fe for Mg, which may be formed in iron-rich and relatively acidic environment. The chlorite geothermal thermometer estimated that the formation temperature of two types of chlorite is 166.32-245.62 ℃ with an average of 219.15 ℃ Chlorite with co-occurrence with sulfide has a relatively high formation temperature, but both are in the mid-low temperature range. The formation mechanism of chlorite mainly shows two kinds of dissolution-crystallization and dissolution-migration-precipitation crystallization.