青海茫崖镇大通沟南山地区基性超基性岩地质特征及找矿前景

Geological characteristics of basic-ultra basic rocks in Nanshan area of Datonggou village of Mangya town in Qinghai province and their ore prospecting potential

青海省茫崖镇大通沟南山一带呈脉状产出的基性超基性岩发育,岩体岩相分带清楚,已发现铜镍矿体的基性超基性岩具有高Mg、低碱、低Ca、低Ti和较高Mg#值的特征,岩体的形成与碰撞造山后的伸展作用有关;发育与基性超基性岩吻合较好、强度高、规模大的Cu、Co、Cr、Ni化探异常及磁异常。通过对区内铜镍矿化的基性超基性岩地质特征、岩石学特征及地球化学特征研究,认为该区与基性超基性岩有关的铜镍成矿条件较好,具有寻找铜镍硫化物矿床的较好前景。

Basic-ultra basic dykes are developed in the Nanshan area of Datonggou village.The intrusive bodies show distinct rock facies and zones.Basic-ultra basic rocks associated with the known Cu-Ni ore bodies are characterized by high Mg,low alkali,Ca and Ti,high Mg#value.The rock formation is related to the post-cillisional orogenic extension.In the Nanshan area occur large and highly intense Cu,Co,Cr and Ni geochemical anomalies and magnetic anomalies.The anomalies are well coincided with the basic-ultra basic rocks.Based on geological,Petrological and geochemical characteristic study of the basic-ultra basic rocks associated with Cu-Ni mineralization we consider that the basic-ultra basic rocks in the Nanshan area are endowed with advantageous metallogenic condition and potential for further Cu-Ni sulfide deposit prospecting.