莱州湾东部滨海砂金成矿远景初步分析

本文阐述了莱州湾东部滨海砂金的物源、地貌、水动力、第四系、新构造运动和海平面变化等成矿条件以及砂金的富集特点,对该区砂金的成矿远景进行了区划和评价,初步认为该区具有良好的砂金成矿远景。

POTENTIALITY OF LITTORAL PLACER GOLD MINERAL RESOURCES IN THE EAST OF THE LAIZHOU BAY

The northwest part of Jiaodong is a low-mountain and hilly area, where uplift with synchronous weathering and denudation has long taken place. Primary gold deposits well develop, and mineral occurrences can be found here and there in the area. The weathered and denuded materials are trans-ported by rivers to the east littoral area of the Laizhou Bay and therefore make this part a good place for placer gold mineralization. In the littoral area, Quaternary sediments well develop and both s'ea and river hydrodynamic actions are active, and all these will make placer gold enriched there.Placer gold can see its enrichment mainly in the river mouths, and this is controlled by distribution of the primary gold deposits. In Quaternary sediments, placer gold mainly exists in the bottom part or in the sandy gravel above the scouring-sedimentation surface. Sediments from gold-bearing layers generally have larger grain sizes and often contain gravels.According to minerogenetic conditions, enrichment characteristics and engineering geology, there is a good prospect of placer gold in the river mouth area and near a primary gold mineral zone.