中蒙跨境阿尔泰地区铍区域地球化学特征

Regional Geochemistry of Beryllium in the Altay Area Across the Border between China and Mongolia

本文收集了中蒙边界1∶100万地球化学铍数据,探讨其在不同构造单元内的背景值及区域地球化学异常特征。全区铍元素总体中位值和平均值分别是1. 93×10^(-6)和2. 08×10^(-6),中国境内铍元素中位值(1. 99×10^(-6))和平均值(2. 14×10^(-6))分别高于蒙古国境内铍元素中位值(1. 90×10^(-6))和平均值(2. 02×10^(-6));对于划分的构造单元而言,阿尔泰南缘弧盆系和阿尔泰构造带是铍元素富集区,且产出大量稀有金属矿床;根据85%累频圈定出8个铍异常区并优选出6个铍地球化学省,为该区寻找稀有金属矿床提供重要选区;该项研究填补了中蒙跨境阿尔泰地区铍地球化学分布的空白,同时为两国边境上重要矿床对比提供重要数据。

This paper discusses the background values and regional geochemical anomalies of beryllium in different tectonic units based on 1:1 000000 beryllium data in the Altay area across the border between China and Mongolia. Results show the median and average values of the whole area are 1. 93 × 10-6 and 2. 08 × 10-6,respectively;and these two values in China side( 1. 99 × 10-6 and 2. 14 × 10-6) are higher than that in Mongolia side( 1. 90 × 10-6 and 2. 02 × 10-6). The median and average values of the arc basin system in the southern margin of Altay and the Altay tectonic belt are higher than other tectonic belts,showing that beryllium is enriched in these areas. A total of 8 lithium geochemical anomalies based on 85 cumulative frequencies are delineated,six of which with coverage of over 1 000 km2 are considered potential prospect areas of lithium resources. This work fills the gap in the beryllium geochemical distribution and provides important data for comparison of deposits in this area.