Characteristics of element migration during hydrothermal alteration in Anjiayingzi Gold Deposit,Harqin Banner,Inner Mongolia,and its geological significance
Extensive hydrothermal alteration occurred to Anjiayingzi Gold Deposit during mineralization.The sequence of alteration types from early to late is albitization,sericitization,silicification,pyrite sericitization,chloritiza-tion.Through the analysis of major and micro elements in various altered rock samples and their original rocks,this paper studied the characteristics of element migration during hydrothermal alteration in detail.The results show that①the main elements SiO2,CaO,MgO,Fe2O3 and TiO2 show a gradual decreasing feature;②the large ion lithophile elements K,Rb,Th in the micro elements show an increasing trend,while Sr shows a decreasing trend,and Bi shows an obvious increas-ing feature in all alterations;③the abundance of rare earth shows an increasing trend;④the ore-forming elements Bi,Cu and Zn have high contents in the pyrite sericitization and silicification stages.Combining with the petrographic character-istics,it is further revealed that the unloading of ore-forming elements starts from the stage of pyritization,and is concen-trated in the silicification stage,providing a basis for the positioning and delineation of ore bodies.
hydrothermal alterationelement migrationAnjiayingzi Gold DepositHarqin Bannermajor elementmicro element
万方数据
维普
