山东蒙阴县西峪金伯利岩带深部综合地球物理特征及其意义  

Deep comprehensive geophysical characteristics and significance of the Xiyu kimberlites in the Mengyin County, Shandong Province

作　　者：程光锁 刘卫东[4] 褚志远 周军 赵德庆 胡戈 梁太涛 CHENG Guangsuo;LIU Weidong;CHU Zhiyuan;ZHOU Jun;ZHAO Deqing;HU Ge;LIANG Taitao(Shandong Institute of Geological Sciences,Jinan,250013;Shandong Provincial Key Laboratory of Geological Processes and Mineral Resources Utilization and Metal Mineralization,Jinan,250013;Key Laboratory of Geological Processes of Gold Mineralization and Mineral Resources Utilization Subordinated to the Ministry of Land and Resources,Jinan,250013;Shandong Provincial Bureau of Geology and Mineral Resources,Jinan,250013;The 7th Institute of Geology&Mineral Exploration of Shangdong Province,Shandong Linyi,276006;Key Laboratory of Diamond Mineralization Mechanism and Exploration,Shandong Province Bureau of Geology&Mineral Resources,Shandong Linyi,276006;Shandong Institute of Geophysical&Geochemical Exploration,Jinan,250013)

机构地区：[1]山东省地质科学研究院,济南250013 [2]山东省金属矿产成矿地质过程与资源利用重点实验室,济南250013 [3]国土资源部金矿成矿地质过程与资源利用重点实验室,济南250013 [4]山东省地质矿产勘查开发局,济南250013 [5]山东省第七地质矿产勘查院,山东临沂276006 [6]山东省地矿局金刚石成矿机理与探测重点实验室,山东临沂276006 [7]山东省物化探勘查院,济南250013

出　　处：《地质学报》2020年第9期2772-2782,共11页Acta Geologica Sinica

基　　金：山东省地矿局地质科技攻关项目(编号KY201602);山东省重点研发计划项目(编号2017CXGC1607);中国地质调查局项目(编号12120114054301)资助的成果。

摘　　要：山东省蒙阴地区金伯利岩的深部地质构造特征是地学研究的热点之一。在蒙阴地区金伯利岩分布区中心部位的西峪岩带进行了10 km综合地球物理勘查,采用地震反射、大地电磁测深及重力测量解译推断出上五井和西峪两处的深部断裂构造。其中,西峪断裂带是金伯利岩浆侵入的先期控制性构造和岩浆通道,在西峪金伯利岩带内,地震反射波同相轴异常、重力低密度体、电阻率低阻异常都较为明显,且异常带有一定的连续性和规模,与已知的浅部金伯利岩体的分布形态比较吻合,推测地表延伸4 km深度内,西峪岩带内有较好的金伯利岩的发育,岩体在深部呈现节藕状间断分布。金伯利岩浆在近地表处隐爆,造成更多的破碎带和次生断裂,形成由密集零散分布的金伯利岩体组成的金伯利岩带,同时产生岩石的低电阻率和低密度异常。The deep geological structure of kimberlite in the Mengyin area of the Shandong Province is one of the research hotspots in geosciences. A 10 km comprehensive geophysical exploration was carried out in the Xiyu rock belt in the center of kimberlite distribution area in the Mengyin County. The deep fault structures of Shangwujing and Xiyu were inferred by seismic reflection, magnetotelluric sounding and gravity survey interpretation. Among them, the Xiyu fault zone is a pre-controlled structure and magma channel for kimberley magma intrusion. In the Xiyu fault zone, the anomalies of seismic reflection in-phase axis, gravity low-density body and resistivity low resistance are obvious. Also, the anomaly zone has certain continuity and scale, which is consistent with the known distribution form of shallow kimberlite. It is speculated that within a depth of 4 km of surface extension, there should be a good development of kimberlite in the Xiyu rock zone, and the rock mass presents nodal discontinuous distribution in the depth. The hidden explosion of kimberlite magma near the surface of the earth results in more fracture zones and secondary faults, forming kimberlite zones composed of dense and scattered kimberlite bodies, and at the same time producing low resistivity and low density anomalies in rocks.

关 键 词：蒙阴地区 金伯利岩 西峪岩带 地震反射剖面 大地电磁测深剖面 重力剖面 

分 类 号：P619.241[天文地球—矿床学]