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通过老湾金矿床矿石中石英和花岗岩中的主要造岩矿物石英、钾长石的4 0 Ar/ 39Ar定年 ,获得成矿年龄为 91.5± 1.0Ma ,成岩期高温坪年龄为 10 4 .1± 1.0Ma～ 10 8.9± 0 .3Ma ,等时线年龄为 10 2 .8± 0 .1Ma～ 10 8.7± 0 .1Ma ,因此认为成岩成矿具同时性。结合秦岭 -大别造山带的演化历史 ,提出老湾金矿床和老湾花岗岩均形成于燕山晚期 ,成矿略晚于成岩 ,构造应力环境为挤压向伸展转化的过渡期或以张应力为主的构造体制
Through the 40Ar / 39Ar dating of quartz and potassium feldspar, the major rock-producing minerals of quartz and granite in the ore of Laowan gold deposit, the metallogenic age was 91.5 ± 1.0Ma, and the geothermal age at the diagenetic stage was 104.1 ± 1.0Ma ~ 10 8.9 ± 0.3Ma, the isochron age is 10 2 .8 ± 0 .1Ma ~ 10 8.7 ± 0 .1Ma, so that the diagenetic mineralization with the same time. Based on the evolution history of the Qinling-Dabie orogenic belt, it is proposed that the Laowan gold deposit and Laowan granite both formed in the late Yanshanian period, and the mineralization was slightly later than diagenesis. The tectonic stress environment was the transition period from extrusion to extensional transformation or the tensile stress was The structure of the Lord