中国东北森林沼泽区砂金分布对岩金找矿的指示意义

Indicative Significance of Placer Gold Distribution for Prospecting Primary Gold Deposits in Forest-Swamp Areas of Northeast China

东北地区是我国最重要的砂金集中产区。由于森林沼泽的覆盖,长期以来岩金找矿难度大、进展缓慢。本文利用"信息量法"研究东北地区砂金分布的密度与大中型岩金矿床分布的关系,研究认为,砂金密度是岩金找矿的重要指示标志,砂金密度越大的地区,找到大中型岩金矿床的可能性越大,并据此圈定了7个岩金成矿远景区。

Northeast China is the most important area of placer gold production in China. Because it is covered with forests and swamps, prospecting placer gold is difficult and slow progress is made in this area for a long time. This paper utilized the information method to study the relationship between primary gold distribution density and large-to middle-sized primary gold deposits in this region. The results suggest that placer gold distribution density can be indicative of the occurrence of primary gold deposits. An area with higher the gold placer distribution density has a larger possibility to discover primary gold deposits. Using this criterion, seven metallogenic prospective regions are delineated in Northeast China.