Study On The Metallogenic Model Of Shuiyindong Gold Deposit In Zhenfeng County,Guizhou Province

The Shuiyindong gold deposit is located in Zhenfeng County of Miao-Buyi Autonomous Prefecture in southwest Guizhou province.The geotectonic position is special.It is located in the joint of two secondary tectonic units of the Youjiang orogenic belt of Yangzi Craton and Huaxia Landmass.Up to now,although the quicksilver cave gold deposit has completed such work as geological survey and general survey,the degree of research on the ore-forming model of the deposit is not very high.Therefore,after detailed field geological investigation and sampling,I hope to sum up the main ore-controlling factors,ore-forming times and metallogenic mechanism of the deposit through systematic study of the metallogenic model of the Shuiyindong gold deposit to provide basic theoretical basis for the breakthrough of deep and peripheral prospecting.In this paper,the main minerals in the gold deposit are pyrite,which is the main gold-bearing mineral in the study area during the metallogenic period,and it is found that the arsenic-bearing ring belt pyrite is the main carrier of gold.Gold occurs as "invisible" gold in the arsenic-bearing ring pyrite.Then,the metallogenic stages and stages of the deposit are divided by the comprehensive induction of the mineral intergrowth relationship,the alteration characteristics of the surrounding rock,the structural characteristics of the ore and the occurrence form of gold.It is found that both the mineral composition and the alteration of the surrounding rock and the occurrence of gold are in accordance with the characteristics of the Karin gold deposit.At the same time,the geochemical characteristics of the ore are analyzed,and the trace element analysis of the unaltered samples in the study area is compared with the earth average value and the samples after mineralization.It is found that the metallogenic minerals are likely to be derived from the ore-forming fluid rather than the surrounding rock,which also provides clues and conjectures for the tracing of the later material sources.The fluid inclusions in the Shuiyindong gold deposit are mainly gas-liquid two-phase inclusions,and the deposits are medium-low temperature deposits.Then,the origin and genesis of hydrogen,oxygen isotope,sulfur and lead isotope werestudied.Based on the experimental data of hydrogen and oxygen isotopes and the previous data,it is found that the main source of ore-forming fluid is primary magmatic water.At the same time,according to the analysis and mapping of sulfur isotope and lead isotope after a large amount of data integration,the tracer of sulfur isotope shows that the metallogenic hydrothermal originated from deep magma,and the source of lead isotope shows that the metallogenic hydrothermal source is the magmatism of subduction zone mixed with upper crust and mantle.The study of isotopic chronology also shows that the metallogenic age of Shuiyindong gold deposit is between 82?149.8 Ma and belongs to Yanshanian period.Finally,according to all the above conclusions and analysis results and the geological facts of Yanshanian period,it is suggested that the Shuiyindong gold deposit is caused by the tectonic movement of the Yanshanian plate subduction.According to the above research results,this paper considers that the Shuiyindong gold deposit is the Carlin type gold deposit of the epithermal origin.