Discovery and significance of pegmatitic rare metal deposits in Shangshi area,Lianyunshan,Northeast Hunan Province
The northeast of Hunan Province,located in the northwestern margin of the central part of the Qinzhou-Hangzhou metallogenic zone,has always been an important polymetallic metallogenic area of Au,Cu,Co,Pb and Zn in China.In this"Li-Co ore survey evaluation and target selection in Lianyunshan area of Hunan Province"project,we carried out the 1∶10 000 geological mapping process and found a large number of spodumene veins,whose single sample grade reached 1.78％.In addition,25 pegmatite veins were found,ranging from 1～10 meters in width,extending mainly in N-W and near E-W directions and from several meters to hundreds of meters.More than 20 mineralized spots of pegmatite were identified,including spodumene,niobium-tantalite,beryl and other rare metal minerals.There are obvious gradual zonings between pegmatite dike and surrounding rock,which can be subdivided into migmatite schist zone(Ⅰ),monzonite granite zone(Ⅱ),tourmaline pegmatite zone(Ⅲ)and massive albitite+spodumene zone(Ⅵ).The lithium ore bodies are mostly located in the massive albitite+spodumene zone,accompanied by a large number of giant crystal tourmaline,muscovite,etc.,showing good lithium metallogenic potential.A large number of rare minerals such as niobium-tantalite and beryl are associated,and some of which reach the co-associated grade of lithium ore.The main ore-bearing pegmatite vein of the deposit is near east-west trend,with a length of more than 1 km,a width of several meters to tens of meters,and a thickness of more than 100 meters.The average grade of Li2O is 1.42％,and the predicted reserves are about 2.56×104 t,which can reach medium scale.The discovery of pegmatitic lithium rare metal deposit in Shangshi area has completely changed the distribution pattern of rare metals dominated by Be-Nb-Ta,indicating the great potential of rare metal mineralization in this area,and of great guiding significance for the new round of ore exploration.
Rare metal depositZonation of pegmatiteLithium deposit of ShangshiLianyunshan areaNortheast of Hunan Province
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