Characteristics Of Mafic Dikes In The Gold Metallogenic Belt Of Dadu River

The Dadu River metallogenic belt of mafic dikes are widely distributed in the Dadu River gold metallogenic belt in the gold deposit area have appeared,and the space to have some differences,in recent years,many scholars and experts on the relationship between the mafic dikes and gold mineralization put forward many views,some people believe that there is a close relationship between these the Dadu River dikes and gold metallogenic belt of gold,some people think that there is no direct relationship between the two.The former that the gold metallogenic belt of Dadu river beds have appeared and most of the mafic dikes from the ore bearing quartz veins showing intrusive contact,after that there was no direct evidence of the mafic dikes formation time and formation of the gold deposit in this area tectonic period same,and there is no systematic study on the relationship between the causes.To solve this problem,under the guidance of the supervisor,the Dadu River dikes in different times,detailed research and comparison of different rocks in two aspects,the following understanding:1.The zircon U-Pb dating shows that the mafic dikes in the gold metallogenic belt of the Dadu River formed during Indosinian(212Ma~224Ma),Caledonian(425Ma~435Ma)and Jinningian(731Ma~754Ma),among them,the mafic dikes in the Jinning period are mainly distributed in the basal conglomerate,During the Caledonian and Indosinian periods,mafic dikes were widely distributed and appearin the basal conglomerate and the sedimentary covers.But the bed pianyanzi gold Caledonian mafic dikes in the Dadu River metallogenic belt of the southern,central and Northern Baijintaizi and Erligou gold deposit are exposed.The mafic dikes of Indosinian mainly distributed in Erligou gold deposits in the Dadu River gold metallogenic belt in the north and Yizhuxiang gold deposit.2.The mafic dikes of Dadu River gold metallogenic belt in the 3 periods of the volcano formed in the island arc environment,alkaline environment and ridge intraplate extensional environment;According to the measured trace element data of the mafic dikes in the study area,the ratio of Zr/Y to Zr/Nb is less than 18,so the source material of the basic dikes in this area is derived from the enriched mantle.3.It can be seen from geological characteristics that the basic dikes in the study area have undergone strong alteration,both with residual crystalline structure,and all of them have been eroded by later siliceous hydrothermal fluids.