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內生成因鈷矿物主要以砷化物、硫砷化物和硫化物形式出现,笔者根据鈷矿床的实际研究和文献资料的分析,确定它們的共生类型主要为(1)硫化鈷型;(2)輝砷鈷矿型;(3)方鈷矿—斜方砷鈷矿型;(4)鈷鎳砷化物型。笔者采用Co-Fe-As-S系成分—共生图解来說明上述各类型的矿物成分特征和成矿溶液离子浓度变化的意义。利用这一图解可以清楚地闡明主要內生鈷矿物在不同类型中分布的规律性,它取决于成矿溶液中硫、砷、鉄、鈷等离子浓度的不同对比。根据各类型中的鈷矿物形成順序,表明成矿阶段初期通常以低硫化物,或低砷化物的形成为其特征,而成矿阶段后期以高硫化物,或高砷化物的出现为其特征。从上述各类型中,(2)和(3)主要形成于高温热液阶段,(4)乃是典型中低温热液阶段的矿物組合,(1)在高温或中低溫热液阶段均可出现。确定它們形成温度的重要标志之一,是在其矿物組合中有否鎳矿物的共生。
Because of the appearance of cobalt minerals mainly in the form of arsenic, sulfur arsenide and sulfide, according to the actual research and literature analysis of the cobalt deposits, the authors determine that their symbiotic types are (1) cobalt sulphide type; (2) Arsenic cobalt ore type; (3) side cobaltite - orthopyroxene cobalt type; (4) cobalt nickel arsenide type. The author uses the Co-Fe-As-S component - symbiotic diagram to illustrate the above types of mineral composition characteristics and the significance of the change of ion concentration of ore-forming solution. Using this diagram it is clear that the regularity of distribution of the major endogenous cobalt minerals in different types depends on the contrast of the concentrations of sulfur, arsenic, gallium, and cobalt ions in the ore-forming solution. According to the sequence of the formation of cobalt minerals in each type, it indicates that the initial stage of metallogenic stage is usually characterized by the formation of low-sulfide or low-arsenic, while the later stages of mineralization are characterized by the presence of high-sulfide or high-arsenic . From the above types, (2) and (3) are mainly formed in the high-temperature hydrothermal stage, (4) are mineral assemblages of the typical mid- and low-temperature hydrothermal stage, (1) occur at high or low and intermediate hydrothermal stages . One of the most important symbols in determining their temperature formation is the presence of nickel minerals in their mineral assemblages.