山东半岛海域成矿区带划分浅析

Primary Analysis on the Division of Metallogenic Belts in Shandong Peninsular Sea Area

摘要:

山东半岛海域成矿区带划分以往研究程度较低。该文利用海域重磁资料，在研究区梳理了渤海和黄海的重磁异常特征，渤海和北黄海呈负布格重力异常，南黄海北部与之相反；渤海为正磁异常，黄海与之相反。以重磁异常为基础，基于陆域构造单元划分，对海域构造单元划分至Ⅲ级10个构造单元，海域构造单元多为陆域向海域的延伸，仅渤中坳陷和北黄海盆地为独立的海域构造单元。参照陆域成矿区带划分，以构造单元边界为界线，海域成矿区带划分至Ⅳ级6个成矿区，各成矿区特征不同，坳陷构造单元内成矿区富集油气矿产，隆起构造单元内成矿区表现为埕宁隆起富集煤矿，胶北隆起富集金、菱镁矿、煤、灰岩矿，千里隆起富集岩金、蛇纹岩、石棉、花岗石矿。

Abstract:

Few research has been made about the division of metallogenic belts in Shandong peninsular sea area. In this paper, the gravity and magnetic anomalies of Bohai Sea and Yellow Sea have been summarized by using marine gravity and magnetic data. Bougucr gravity anomalies are negative in Bohai Sea and the north Yellow Sea, but it is opposite in the North of South Yellow Sea. It is showed that Bohai Sea is a positive magnetic anomaly area, but the Yellow Sea is a negative magnetic anomaly area. The sea area tectonic units are divided into 10 tectonic units with the level of Ⅲ based on the gravity and magnetic anomalies and terrestrial tectonic units. The sea area tectonic unit is an extension of the land area to the sea area except for the units in Bozhong Depression and the North Yellow Sea Basin. Referring to the division of the territorial metallogenic belts and the boundary of the sea area structural units, the sea area is divided into 6 metallogenic areas with the level of Ⅳ. The characteristics of each metallogenic area are different.The depression areas are rich in oil and gas minerals. Chengning uplift is rich in coal. Jiaobei uplift is rich in gold, magnesite, coal and limestone. Qianliyan uplift is rich in gold, serpentine, asbestos and granite.