【作者】 汤云晖； 袁万明； 韩春明； 董金泉； 王世成；

【Author】 Tang Yunhui Yuan Wanming Han Chunming Institute of High Energy Physics, Chinese Academy of Sciences

【机构】 中国科学院高能物理所；

【摘要】 <正> 裂变径迹方法,是利用磷灰石、锆石等含²³⁸U矿物的裂变径迹年龄及径迹长度分布来反演地质历史时期地质体热历史的一种分析方法,可提供岩体在不同的温度下的热事件年龄。锆石的退火带温度与峪耳崖的热液成矿温度相吻合,通过锆石的裂变径迹年龄可有效地反映出成矿过程中热液的活动状况,而磷灰石的裂变径迹年龄则厘定了成矿年代的下限。本文通过峪耳崖含矿岩体中的锆石、磷灰石裂变径迹分析,揭示了自中生代燕山期以来,峪耳崖地区经历了频繁、多期次的热液活动。磷灰石、锆石的裂变径迹年龄显示,金矿的成矿年更多还原

【Abstract】 Fission track(FT) method is a analyzing way to demonstrate their thermal history of geological bodies by some 238U-doped minerals such apatite and zircon and to supply their current ages when a rock body stay in these minerals’ annealing temperatures ranges. In this article, fission track analyzing of zircon and apatite from Yuer’ya gold-doped rock samples discloses multi-phase hydrothermal liquid actions since YanShan Period, Mesozoic Phase, when hydrothermal liquids with zircon annealing temperature (～200-350℃) are related with gold depositing. Zircon FT ages show that gold mineralizes from 115 Ma to 200 Ma and the main mineralization phases are 115-190Ma. Relationship between zircon FT ages and sample’s distribution (horizontal height) show hydrothermal liquid comes from the deep underground resources and some surface-water participation in gold mineralization. The cooling of hydrothermal liquid is from north to south, which means hydrothermal liquid come from the south. And mineralizing hydrothermal liquid movement is apparently controlled by construct with northeast-southwest trend. The formation of Yuer’ya gold mineraliztion is related with the constructional background of the whole eastern China of that time.更多还原