Geological Characteristics And Copper-polymetallic-mineralization Studies Of Marine Volcanics In Duocai-Dangjiang Ziduo Qinghai Province

The author had conducted detailed field geology survey and comprehensive research about marine volcanics in Duocai-Dangjiang Ziduo Qinghai province,the study focused on the volcanic rocks of the copper polymetallic mineralization.On rock science,geochemistry,rock facies,isotope chronology and geotectonic background,the article analyzes the volcanic rocks about composition,the mineralization of rocks,the geochemical characteristics,the tectonic environment and the formation of the age.We found that is closely related to the magmatic hydrothermal tungsten ore and the skarn-type iron ore deposit.The volcanic activity in the area is strong,and the characteristics of multiple cycle times,iron,non-ferrous metal,precious metal metallogenetic material and volcanic activity are closely related.There are two metallogenic periods,namely the hualixi period and the indo-chinese period,which is the most significant in the period of the indo-chinese.The characteristics of the stratum control and time control of ore deposits related to volcanism are obvious(Such as the Duocai polymetallic deposit and the Dangjiang copper deposit,the mineralization formation is the Triassic volcanic rock group,and the mineralization lithology is the Marine anemaneou stuff,which is calc-alkali volcanic rock).According to the comprehensive study,the volcanic rock formation in the area of the measuring area is dominated by the fissure volcanic eruption,and the central volcano erupts as the second time(report on the mineral prospective survey in the district of the galonggema district in qinghai province,2016).Magmatic activity focused on middle-late Triassic,mainly for the Marine fissure eruption rock,also to island arc volcanic rocks,the layered,mainly for the acidic,neutral,basic lava and welded pyroclastic rock,that are an important part of the Duocai ophiolitic melange.The secondary volcanic-sedimentary volcanic-sedimentary volcanic basin in the rift environmenthas a large number of eruptive cycles,and the dpr which is located near the top of the cycle,is an important mineral-rich rock formation.