| 粤北地区乳源-潮州MT剖面深部电性结构及地学意义 |
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| 引用本文： | 韩江涛,刘国兴,韩凯.粤北地区乳源-潮州MT剖面深部电性结构及地学意义[J].吉林大学学报(地球科学版),2012(4):1186-1191,1198. |
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| 作者姓名： | 韩江涛 刘国兴 韩凯 |
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| 作者单位： | 吉林大学地球探测科学与技术学院 |
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| 基金项目： | 国家深部探测技术与实验研究专项项目(SinoProbe02-04-02);吉林大学基本科研业务费(450060481097) |
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| 摘 要： | 为了揭示粤北地区岩石圈深部结构、深大断裂性质及花岗岩分布规律等科学问题,布设了乳源-潮州宽频带大地电磁探测剖面。由二维反演得出的电性结构,讨论了粤北地区岩石圈导电性结构特点。沿剖面存在3个花岗岩分布区,呈现不同的类型,可能代表不同的成因模式。沿剖面划分3条北东向断裂带:吉安-四会断裂、赣江断裂于韶关东形成宽度近20km的低阻区域,其间形成断陷盆地;河源-邵武断裂带,其两侧发育壳幔高导层并发育壳幔混合型花岗岩,深部电性结构复杂,可能为壳幔剧烈作用的场所;丽水-海丰断裂带,控制了燕山晚期花岗岩的分布。韶关、连平之间和龙川、丰顺之间50～150km存在2个巨大的低阻体,可能是地幔物质底侵作用的"通道";且底侵方向指向连平和龙川之间的区域,由于底侵作用力贡献,发育了一系列的壳内和上地幔高导层。粤北地区岩石圈从西向东逐渐减薄,从100余km减薄到60km,反映了太平洋板块对欧亚板块的消减作用。潮州100km深度以下的中-低阻特征,推断为太平洋板块俯冲作用留下的"洋壳"物质。
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| 关 键 词： | 粤北地区 乳源-潮州 大地电磁 电性结构 地学意义 |
Electrical Structure and Geological Significance of Ruyuan-Chaozhou Magnetotelluric Profile in Northern Guangdong |
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| Han Jiang-tao,Liu Guo-xing,Han Kai.Electrical Structure and Geological Significance of Ruyuan-Chaozhou Magnetotelluric Profile in Northern Guangdong[J].Journal of Jilin Unviersity:Earth Science Edition,2012(4):1186-1191,1198. |
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| Authors: | Han Jiang-tao Liu Guo-xing Han Kai |
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| Institution: | College of GeoExploration of Science and Technology,Jilin University,Changchun 130026,China |
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| Abstract: | Ruyuan-Chaozhou MT profile was measured to study the struture of deep lithosphere,deep faults and granite distribution laws in northern Guangdong.Basing on the electrical structure from the 2D inversion,the authors study the conductivity properties of the lithosphere in northern Guangdong,find that there are three granite along the distribution profile,showing different types,and may represent different genetic model.There are three faults along the profile: between the Ji’an-Sihui fault and Ganjiang fault in Shaoguan east have a deep low resistivity fracture zone with the depth of 20 km,froming a fault basin;Crust-mantle mixing type granite and crust-mantle high conductivity layer develop along the two sides of Heyuan-Shaowu fault,have compplicated electrical structures in deep lithoshpere,this area maybe the place of dramatic action between crust and mantle;Lishui-Haifeng fault controls the distribution of granite from Late Yanshan period.In the depth of 50-150 km between the Shaoguan-Lianping and the Longchuan-Fengshun,two huge anomolies with low resistivity develop that maybe the "channel" formed in the underplating of mantle substances,and the direction of the underplating points to the area between Lianping and Longchuan,due to the contribution of underplating,there are a series of high conductivity layers develop in the crust and upper mantle.The depth of the lithosphere in northern Guangdong decreases from 100 km to 60 km from west to east,this feature reflects the cut effect of Pacific plate to the Eurasian plate;It characerizes as middle and low resistivity under 100 km in Chaozhou,the substance with middle and low resistivity is deduced as oceanic curst from the subduction of the pacific ocean. |
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| Keywords: | northern Guangdong Ruyuan-Chaozhou magnetotellurics electrical structure geological significance |
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