The Copper-nickle Mine Features of Niubiziliang in North-west Margin of Chaidamu Basin, and Discoverable Significance

The Niubiziliang copper-nickle deposit is located in the north-western ancient continental margin of Chaidamu Basin,whose mineralization is relative to mafic-ultramafic layered igneous complex.We found three plutons,of which No.Ι rock was larger with exposed area of nearly 7km²,the other two rock was smaller.The rock with striated and layered structure,cumulatic texture is apparent.Exposed lithology of No.Ι rock was based light-colored layered gabbro,diorite,and local folder mafic rocks,and these rocks are representative of the upper part of layered igneous complex sequence.No.Ⅱand Ⅲ rock are compsed of based mafic and ultramafic rock,which represents the lower layered igneous complex sequence,with the main seam position.In No.Ⅱand Ⅲ rock,nine Cu-Ni sulphide ore bodies are identified by few trenching and drilling results.One is indicated by 41.1m apparent thickness with 0.5% average Ni grade,the highest 1.57%.Ore minerals include magnetic pyrite,nicopyrite,chalcopyrite etc.The deposit belongs to the type of magmatic liquation with post hydrothermal solution superposition.It has very important significance that this type of deposit suggests that it is identified in the Chaidamu block margin for the first time;it provided strong evidence for searching Cu-Ni sulphide deposits associated with mafic-ultramafic rocks in the margin of Chaidamu Basin.