莱州湾东部海域重力场及断裂构造特征  

Characteristics of Gravity Field and Fault Structures in the East of the Laizhou Bay

作　　者：刘洪波 王润生 胡雪平[5] 勇晓宇 吴治国 贺春艳 孟庆发 李嘉 王恩强 张宁 LIU Hongbo;WANG Runsheng;HU Xueping;YONG Xiaoyu;WU Zhiguo;HE Chunyan;MENG Qingfa;LI Jia;WANG Enqiang;ZHANG Ning(Shandong Institute of Geophysical and Geochemical Exploration,Jinan 250013,Shandong,China;School of Civil Engineering,Shandong University,Jinan 250061,Shandong,China;Shandong Provincial Engineering Research Center for Geological Prospecting,Jinan 250013,Shandong,China;Shandong Engineering Research Center of Underground Resources and Environment High Precision Detection,Jinan 250013,Shandong,China;Shandong Institute of Geological Survey,Jinan 250014,Shandong,China;College of GeoExploration Science and Technology,Jilin University,Changchun 130026,Jilin,China)

机构地区：[1]山东省物化探勘查院,山东济南250013 [2]山东大学土建与水利学院,山东济南250061 [3]山东省地质勘查工程技术研究中心,山东济南250013 [4]地下资源环境高精度探测山东省工程研究中心,山东济南250013 [5]山东省地质调查院,山东济南250014 [6]吉林大学地球探测科学与技术学院,吉林长春130026

出　　处：《黄金科学技术》2025年第1期32-43,共12页Gold Science and Technology

基　　金：国家自然科学基金NSFC-山东联合基金项目“胶东深部金矿断裂控矿机理”(编号:U2006201)资助。

摘　　要：莱州市三山岛北部海域超大型金矿的发现,揭示了莱州湾东部海域金成矿地质条件优越,找矿潜力巨大。为进一步推进海域金矿勘查工作,利用最新1/20万陆海域高精度重力资料,对莱州湾东部陆海域重力场特征进行了研究。结果表明:莱州湾东部陆海域重力场总体表现为强烈波动性和等值线带状展布特征;通过布格重力异常场源分离,对昌邑—大店断裂以东海域的断裂构造体系进行了划分,共推断断裂17条,可划分为NE、NW和EW向3组断裂,其中NE向断裂为区内主要控矿断裂。研究结果为区内基础地质研究、矿产地质调查和金矿资源勘查工作提供了高精度重力数据支撑。A significant gold deposit has been identified in the northern maritime region of Sanshandao,Laizhou City.This discovery indicates that the metallogenic geological conditions for gold deposits are favorable in the eastern maritime area of Laizhou Bay,suggesting considerable potential for further mineral exploration in this region.The characteristics of the gravity field in the eastern land-sea interface of Laizhou Bay were examined utilizing the latest high-precision gravity data at a scale of 1∶200000 for both terrestrial and marine environments.The research findings suggest that the gravity field exhibits significant volatility and a contour strip distribution.Based on these characteristics,the gravity field within the study area can be delineated into two distinct regions:The Jiaoliao Uplift anomaly area and the North China Depression anomaly area.The gravity field in the Jiaoliao Uplift anomaly area predominantly manifests in a northeast-oriented strip pattern.Gravity anomalies exhibit alternating regions of high and low altitudes.Elevated gravity anomalies correspond to highdensity Precambrian metamorphic rocks,whereas low gravity anomalies are indicative of the relatively lowdensity Mesozoic granite bodies.The gravity field demonstrates a clumping feature in the North China Depression anomaly area,which reflects the distribution characteristics of alternating protrusions and depressions within the Yishu fault zone.The fracture tectonic system in the eastern sea area of the Changyi-Dadian fault has been delineated based on the overall characteristics of the Bouguer gravity anomaly and its sitefield transition characteristics.A total of 17 fractures were identified based on the delineation results.These fractures elucidate the intersections among the faults more clearly.The primary trend of the main body fault is oriented northeast,with secondary orientations in the northwest and east-west directions.Notably,the northeasttrending fault serves as the principal ore-controlling fault in the area,and it has bee

关 键 词：莱州湾东部 海底重力 布格异常 重力场特征 断裂构造 金矿勘查 

分 类 号：P618.51[天文地球—矿床学]