中蒙边界地区成矿地质条件优越,是世界上重要的金属成矿省和全球3大斑岩型铜、金、钼成矿带之一,资源潜力巨大,是国内外地学研究和贵金属、三稀资源勘查的热点地区。文章依托中蒙边界1∶1 000 000地球化学填图数据,探讨了汇水域沉积物中金的地球化学参数和区域地球化学分布特征。中蒙边界地区汇水域沉积物金元素含量中位值和平均值分别为0.79×10^-9和1.34×10^-9;华北陆块和阿尔泰构造带金含量最高,区域浓集系数分别为1.43和1.36,是金的富集优势区。以金含量累积频率85%(1.55×10^-9)、92.5%(2.22×10^-9)和97.5%(4.03×10^-9)划分外、中和内带,共圈定28处地球化学远景区,为该区寻找金等贵金属矿床提供了重要选区。研究填补了中蒙边界地区金地球化学空间分布的空白,为两国边境地区金等贵金属矿床对比提供基础数据。

The Sino-Mongolian border area has excellent geological conditions for ore formation and is one of the world’s most important metal mineralization provinces. The area is situated on one of the three largest porphyry copper-gold-molybdenum metallogenic belts in the world with enormous resource potential—it is a hotspot for international and domestic geoscience research and exploration. Based on the 1∶1 million geochemical mapping data of the Sino-Mongolia border areas, the geochemical parameters and regional geochemical distribution of gold in the catchment sediments are discussed in this paper. The median and average gold anomaly values of the catchment sediments were 0.79×10^-9 and 1.34×10^-9, respectively. The North China Block and the Altay Tectonic Belt had the highest gold contents, with the regional concentration coefficients of 1.43 and 1.36, respectively, consistent with regions faverable for gold enrichment. The outer, middle and inner zones of gold geochemical anomalies were identified according to cumulative frequencies of 85% (1.55×10^-9), 92.5% (2.22×10^-9) and 97.5% (4.03×10^-9), respectively. A total of 28 geochemical prospective areas were delineated, providing important exploration targets for gold and other precious metal deposits in this area. The paper fills the gap in the study of gold geochemical distribution, and provides important data for comparing precious metal deposits in the Sino-Mongolia border area.