CAJ | 학술논문

通过对豫西南银洞沟矿床 Y1矿脉的近矿蚀变岩中选取白云母进行40 Ar/39 Ar 年龄测定,获得坪年龄为(284.5±2.0)Ma,相应的等时线年龄为(287.1±4.9)Ma。同时,选取本矿脉的白云母和闪锌矿颗粒进行 Rb-Sr 同位素年龄测试和方铅矿的铅模式年龄计算,得出与白云母40 Ar/39 Ar 年龄测定相近的年龄范围,可见,银洞沟铅锌银矿的成矿年龄为成矿早阶段的蚀变年龄,成矿时代应该不早于284Ma。
통과대예서남은동구광상 Y1광맥적근광식변암중선취백운모진행40 Ar/39 Ar 년령측정,획득평년령위(284.5±2.0)Ma,상응적등시선년령위(287.1±4.9)Ma。동시,선취본광맥적백운모화섬자광과립진행 Rb-Sr 동위소년령측시화방연광적연모식년령계산,득출여백운모40 Ar/39 Ar 년령측정상근적년령범위,가견,은동구연자은광적성광년령위성광조계단적식변년령,성광시대응해불조우284Ma。
Base on dating to muscovite from altered rocks near ore of Y1 vein in yindonggou deposits for 40 Ar/3 9 Ar,we obtain a plateau age of (284.5±2.0)Ma,corresponding isochron age of (287.1 ± 4.9)Ma. At the same time,the isotopic ages tested from muscovite and sphalerite particles with method of Rb-Sr and galena with the lead model age calculations have similar age range to the method of 40 Ar/3 9 Ar test above.So, the mineralizing age of Yindonggou Ag-Pb-Zn deposit is the altered age of Metallogenic early stage and not earlier then 284 Ma.