Geochemical Characteristics And Prospecting Potential Of Neutral Acid Invasive Rocks In Nanhuan Period,Huangshutang,Xichang,Sichuan Province

The article relies on Chinese geological survey Chengdu center project<Sichuan1:50000 scale Huangshuitang,Butuo,Qiaowo,Puge?G48E003001,G48E003002,G48E004002,and G48E004003?to complete the 4 regional geological survey>.Regional stratigraphic development is complete,The work area is located in the Xikang Yunnan tectonic magmatic belt,the development of magmatic rocks has many characteristics,such as multi-period,multi-rock,large scale and wide distribution,.according to the composition,age,origin and occurrence of magmatic rocks,the magmatic rocks in the area can be divided into eight magmatic formation.The work area is located in the south of the Yangtze plate,the main body belongs to the West Sichuan Central Yunnan oldland thrust belt,west of Yanyuan-Lijiang continental margin basin,south west of eastern Yunnan landmass.The paper focuses on the study of the petrogeochemistry of the neutral acid intrusive rock of the Nanhua Period in the Huangshuitang?study area?.The indoor analysis results were combined with the field investigation,it is found that the magmatic rock assemblage type is complicated,rock geochemical composition of the larger span of the characteristics,The lithological association index???ranges from 0.48 to 2.84;the k₂O/Na₂O value ra nges from 0.4 to 1.82.Based on the results from this study,the mid-acid intrusive roc k is a Calcium alkaline rock.The intermediate intrusive rock is a I-type granite while t he acid intrusive rock is a A-type granite as evidence from the K2O-Na2O diagram and the spider diagram of trace element ratio.The comparison the magma association and the regional tectonic magmatism with the adjacent sites suggests that the magmatic ro cks in this period may be formed by the remelting and differentiation of the pre-place d arc magmatism,which is actuated by the invasion/underplating of mantle-derived magma.Through the collection of two age samples test analysis,respectively 773.1�2.8Ma,737�3Ma,combined with the previous work data,it is concluded that the magmatic rock formation of the Nanhua Period.Based on the analysis of the ore-bearing properties of the magmatic rocks in this area,the geochemical anomalies of the rocks,the geophysical anomalies of the rocks and the regional heavy sand anomalies,it is presumed that there may be rare earth ores and W-Sn deposit in the study area.