【摘要】 莱州湾东部是我国滨海砂金矿重要的成矿远景区,区内已探明有残坡积型和冲积型砂金矿床,并在滨海沙堤、沙滩、水下沙坝、水下三角洲、水深小于14m的浅海海域及古岸线、古泻湖、古冲积层中发现砂金异常,特别是海区的发现,为我国浅海砂金的调查开阔了新的前景.本文就该区滨海砂金矿的分布及特征进行了概述.更多还原

【Abstract】 The eastern Laizhou Bay is an important potential area of littoral placer gold deposits of China, in Which both eluvial-deluvial and alluvial placer gold deposits are found. And placer gold anomaly is discovered in the littoral sand barrier, beach, subaqueous bar, subaqueous estuarine delta, seawater shallower than 14m, ancient lagoon, ancient alluvial layers and ancient coastline. Especially, the discovery in the sea area has laid a good foundation for the investigation of placer gold in shallow seas in China.This paper has summarily described the distribution and characteristics of placer gold deposits in the eastern Laizhou Bay and briefly introduced the characteristics of placer gold deposits in the Sanshan Island and in the Zhuliuhe River.The Laizhou Bay littoral lies along the northern boundary of Jiaobei near an old mountain chain which is still rising continuously and stably since Ceno-zoic. A great deal of weathered and eroded mineral-bearing materials have been transported into the littoral area by surficial rivers and accumulated in favorable terrains under marine hydrodynamics. The regional geologic setting of mineralization (the high gold abundance in old metamorphic rocks and in medium-acid magmatic rocks and the wide distribution of rocky gold diposits), and the development of its ancient shoreline, beach, barrier and modern beach are similar to the famous littoral placer gold deposits in Rhome of America.Our survey in littoral placer gold deposits is just at the beginning. Much still remains to be done, especially in the survey in marine areas. We should take the work done in the eastern Laizhou Bay as a breakthrough point of further comprehensive geologic and geophysical investigations in littoral placer gold deposits. If necessary, foreign investment and technique should be introduced to do survey work in littoral gold.更多还原