摘要
通过对莱州湾东部滨海水域地球物理和地质钻探综合调查，业已查明该海区地质构造和古地理环境特征，并发现区内砂金分布较普遍，本文从砂金分布的地貌单元、沉积物类型、砂金成因类型、物质来源、古气候、构造作用、砂金成因等诸方面，研究了该海域内砂金特征。
It is the first time to have made clear the buried river valleys and basement topogra-phy in Pleistocene sediments of the study area. In the study area,marine-built placer gold is widely distributed,and can be found inevery drill core,but the gold is very fine-grained and also in low grade,Thus such gold isimpossible to form large-scale commercial gold ore body.However,small-scale placergold ore can be formed at near-shore river-mouth sand barrier,submerged sand bar,bank slope and delta.Alluvial-pluvial placer gold is mostly found in buried river valley in the sea area,and the gold grains are larger and grade is higher. Ancient river channels,especiallythose of the Jiehe River,Wanshen River,Zhuliu River and Tengjia River,are potentialareas for gold-finding in the future.As gold distribution is closely related to fault structures and some gold ore has ex-tended into sea,we must also take faults in the sea area as the main target areas.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1996年第4期79-86,共8页
Marine Geology & Quaternary Geology
