锆石Hf同位素填图对东昆仑造山带地壳性质和成矿潜力的约束

Constraints of zircon Hf isotopic mapping on crust nature and metallogenic potential of the east Kunlun orogenic belt

文章收集了东昆仑造山带发表的锆石Hf同位素数据,利用Surfer 10软件填制的锆石Hf同位素等值线图显示,东昆仑造山带整体自西向东呈现出古老地壳与新生地壳交替分布的特征,东昆南地体研究程度较低,其东段的布青山—温泉一带的地壳性质与北侧较为相似,显示较低的锆石Hf同位素值(新生地壳)的特征。大量数据和已有研究成果表明,地壳性质(新生地壳或古老成熟地壳)很可能是控制成矿作用类型的关键因素。根据东昆仑造山带地壳性质和成矿作用类型,提出布青山—温泉一带可能是东昆南地体最有潜力的Cu-Au成矿地带。

Zircon Hf isotropic data available are collected and zircon Hf isotropic mapping of the east Kunlun orogenic belt is conducted with Surfer software.The zircon Hf isotropic contour shows characteristics of alternating distribution of ancient crust and new crust from west to east.Research on the South east Kunlun terrace is in low level but lower zircon Hf isotope values of Buqingshan-Wenquan area in east of the terrace is similar to that in the North.According to a lot of data and researches indicating that crust nature(new crust or ancient mature crust)possibly control metallogenic type and situation of Buqingshan-Wenquan area a potential Cu-Au metallogenic belt may occur here.