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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, the H-Kapaa superimposed analysis of the receiver function below 141 broadband stations in northeastern China has been used to obtain the crustal thickness and mean wave velocity ratio in the study area.The results show that the crustal thickness is generally thin and the velocity ratio changes Which is also relatively complicated. There is a relatively obvious east-west difference in crustal thickness, revealing that the crust may be destroyed and reformed in the Meso-Cenozoic in this area, and the value of the crust Poisson’s ratio obtained from the Overlapped Results of the Kapaa is large, Due to its own crustal structural complexity and its close proximity to the front of the Pacific plateaus, it experienced more crustal thinning or mantle-derived upwelling in the Meso-Cenozoic associated with the subduction of the Pacific plate in the Greater Khingan Range Orogenic Belt in the eastern part of Inner Mongolia and The Jiamusi massif, Xingkai massif and Changbai Mountain to the southeast are thicker with thicknesses ranging from 34 km to 37 km, corresponding to an average Poisson’s ratio of 0.311 and an altitude ranging from 0.24 km to 1.515 km between the Yilan-Yitong fault zone and the Dunhua-Mishan fault zone in Jilin and the southwestern Changbai Mountain, the crustal thickness is thin, The degree distribution is mostly between 29 km and 36 km, and the corresponding altitude range is between 0.05 km and 0.775 km. The crustal thickness in the Liaodong area and the lower Liaohe plain is also very thin. From the crustal thickness distribution map, we can easily see that in this area The variation of the thickness of the crust is complicated with crustal thickness ranging from 29 km to 34 km and the main variation range of Poisson’s ratio being from 0.245 to 0.291. The crustal thickness in the Xiaoxing’anling fold belt and Zhangguangcailing range is about 30 km to 32 km and the Poisson’s ratio values vary widely from 0.283 to 0.311.The complicated variation of crustal thickness and Poisson’s ratio in the Yanshan belt in the northern part of North China shows that the region may be affected by the proliferation of the Central Asian orogenic belt and the subduction of the Pacific plate The tectonic evolution of northeast China is closely related to the upwelling of mantle asthenosphere and the subduction of the western Pacific plate in Northeast Asia.The magmatic activity in northeast China is closely related to the formation of mineral resources and oil and gas resources Plays a role in providing source and deep control.