高寒草甸区东部地表疏松层中金、砷、锑的存在形式

MODES OF OCCURRENCE OF Au, As and Sb IN THE UNCONSOLIDATED OVERBURDEN ON THE EASTERN PART OF THE COLD GRASSY HIGHLAND

高寒草甸区主要分布在青海省南部和四川省西北部地区,其东部主要为中浅切割山区,地表疏松层主要由残坡积土和水系沉积物组成。金矿化主要指示元素Au、As、Sb的存在形式以比较稳定的相态(硫化物及稳定的结晶质铁氧化物态和硅酸盐残渣态)为主外,有机结合态占有比较重要的地位。表明在高寒、低山—丘陵的景观条件下,生物地球化学作用是Au、As、Sb迁移、富集的重要因素之一。

Spread in Yushu and Guolou areas in southern Qinghai Province and Ganzi and Aba areas in western Sichuan Province is mainly the cold highland covered with grass, called the cold grassy highland. To the east of these areas is shallowly-moderately dissected mountains. The unconsolidated overburden is composed of residual soil, clinosol and stream sediments. The modes of occurrence of the major indicator elements for gold mineralization, namely Au, As and Sb, occur mainly in such stable forms as sulfides, crystalline iron oxides and silicate residues, and subordinately as organically bound metals. It is held that, under the conditions of low temperature, cold grassy highland and low mountains or hills, the migration and enrichment of Au, As and Sb are mainly attributed to biogeochemical activities.