东北地区地壳结构研究
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摘要
本文通过对中国东北地区的141个宽频带地震台站下方接收函数的H-Kapaa叠加分析,获得了研究区地壳厚度与平均波速比.结果显示,东北地区的地壳厚度总体偏薄,波速比变化也相对复杂,地壳厚度存在相对明显的东西向差异,揭示了该区域地壳在中—新生代可能存在着破坏和改造过程.HKapaa叠加结果所得到的地壳泊松比值较大,很有可能该区域由于其自身的地壳结构复杂性和紧邻太平洋板块前缘从而在中新生代遭受到了与太平洋板块俯冲相关的更为强烈的地壳减薄或幔源物质上涌.内蒙古东部地区大兴安岭造山带地区、及向东南方向的佳木斯地块、兴凯地块、长白山地区的地壳厚度较厚,厚度范围在34 km至37 km之间,对应的泊松比平均值为0.311,海拔高度范围在0.24 km到1.515 km之间.在依兰-伊通断裂带和敦化-密山断裂带之间的吉林地区和长白山西南侧的地壳厚度偏薄,厚度分布多都在29 km至36 km之间,对应海拔高度范围在0.05 km到0.775 km之间.辽东地区和下辽河平原地壳厚度也很薄,通过地壳厚度分布图我们不难看出在该区域内地壳厚度变化程度之复杂,地壳厚度范围在29 km至34 km之间,泊松比主要变化范围在0.245到0.291之间,小兴安岭褶皱带和张广才岭地区的地壳厚度范围大约为30 km至32 km之间,泊松比数值较大变化范围在0.283到0.311之间.华北北缘燕山带地壳厚度和泊松比复杂的变化特征显示,该地区可能受到中亚造山带增生和太平洋板块俯冲的共同影响,从而发生了更为复杂的地壳改造形变.东北地区构造演化与东北亚地区地幔软流圈上涌与西太平洋板块俯冲有着密切的相关.东北地区的岩浆活动在矿产与油气资源的形成过程中起着提供物源和深层控制作用.
In this paper,through the analysis of the receiver function H-Kapaa which obtained from 141 broadband seismic stations of northeast China.The detailed results about the crustal thickness and average wave velocity.The Research results revealed that the crustal thickness of northeast is generally to be thin,also the change of wave velocity ratio is relatively complex,and an obvious difference is exist between east and west crustal thickness.All of these reveals that an destruction and reconstruction process may existin in Cenozoic of this place.The H-Kapaa stacking results to the crustal poisson's ratio are large in Northeast China area,probably the area due to its crustal structure complexity and next to the Pacific plate leading edge,thus suffer more intense crustal thinning or mantle material upwelling,which associate with the subduction of the Pacific plate,in the Cenozoic.The crustal thickness in Inner Mongolia in eastern Greater Khingan Range orogenic belt,the southeast of Jia Musi block and the Xingkai massif,and Changbai Mountain region is thicker,thickness in the range between 34 km to 37 km,the average value of poisson's ratio corresponding to area is 0.311,the altitude range in the 0.24 km to 1.515 km.The crustal thickness in Jilin area and the southwest side of Changbai Mountain,which between the Yilan-Yitong fault zone and the Dunhua-Mishan fault zone,is thinner,thickness distribution is mostly between 29 km to 36 km,corresponding to the altitude range from 0.05 km to 0.775 km.Liaodong area and the lower Liaohe River Plain crustal thickness is very thin,through the earth' s crust thickness distribution map we can see that the variation of crustal thickness in this region iscomplex,the crustal thickness in the range between 29 km to 34 km,poisson's ratio is varied in the range between 0.245 to 0.291.The crustal thickness range of Small Xingan Mountains fold belt and Zhangguangcai mountain area is approximately between 30 km to 32 km,poisson's ratio values are big,varied between 0.283 to 0.311.The conplex variation characteristics of crustal hickness and poisson' s ratio of Yanshan belt,which in the northern margin of North China,display that the region may be affected by the Central Asian orogenic belt accretion and subduction of the acific plate,thus happen more complex crust reconstruction deformation.Tectonic evolution in Northeast and asthenosphere upwelling in the earth mantle of Northeast Asia are closely related with the subduction lag in the West Pacific plate.The magmatic activity of Northeast plays a role that provides matrial source and deep control in the formation process of mineral and petroleum resources.
引文
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