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松辽盆地隆起区地壳反射结构与“断开”莫霍界面 被引量:27
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作者 杨宝俊 唐建人 +6 位作者 李勤学 王建民 s.a.faisal 李瑞磊 王洪志 李占林 张慧 《中国科学(D辑)》 CSCD 北大核心 2003年第2期170-176,共7页
在我国松辽盆地内实施了4条近垂直反射地震法地壳精细结构探测,获得了双程旅行时为15 s的松辽盆地地壳叠后偏移反射剖面.重点研究松辽盆地东南隆起区与东北隆起区反射结构特征.发现松辽盆地隆起区内整体上表现出:由西至东沉积层厚度变薄... 在我国松辽盆地内实施了4条近垂直反射地震法地壳精细结构探测,获得了双程旅行时为15 s的松辽盆地地壳叠后偏移反射剖面.重点研究松辽盆地东南隆起区与东北隆起区反射结构特征.发现松辽盆地隆起区内整体上表现出:由西至东沉积层厚度变薄,由北向南沉积层厚度增厚;无论是东南隆起区还是东北隆起区,壳内反射图案在南北向与东西向均变化剧烈;东北隆起区莫霍界面双程反射旅行时变化范围为9.6-11.0 s,深度范围为30-34 km,东南隆起区莫霍界面双程反射旅行时变化范围为9.7-10.4 s,深度范围为30-32 km.由叠偏剖面资料分析可见松辽盆地隆起带内莫霍界面反射出现特异的断开特征,错距达0.1-0.5 s,约合2 km左右.断开带附近存在多组剪切断裂并表现出隆起带内断开宽、两隆起带交界部位窄的空间分布规律.这些反射图像与特异莫霍界面反射被推断为多期次黑龙江微陆块弱碰撞、太平洋板块向西俯冲等动力因素耦合作用的结果. 展开更多
关键词 地壳结构 构造特征 盆地动力学 松辽盆地 隆起区 近垂直反射地震探测 莫霍界面断开带
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Crustal reflection structure in the uplifting zone of Songliao Basin and disconnecting Moho interface 被引量:6
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作者 s.a.faisal 《Science China Earth Sciences》 SCIE EI CAS 2004年第6期514-521,共8页
In order to obtain the fine structure of Songliao Basin, four nearly vertical reflection profiles were acquired and then processed so as to get the poststack migration sections with two-way travel of 15s. In this pape... In order to obtain the fine structure of Songliao Basin, four nearly vertical reflection profiles were acquired and then processed so as to get the poststack migration sections with two-way travel of 15s. In this paper, we study the reflection characteristics in the southeastern and northeastern uplifting zones of Songliao Basin, discovering that the structure within the up-lifting zones has the following features: (i) The sedimentary thickness decreases from west to east and increases from north to south. (ii) In the northeastern and southeastern uplifting zones, the crustal reflection image varies remarkably along east-west or south-north direction. (iii) In the northeastern uplifting zone, the two-way travel time of Moho interface ranges within 9.6—11.0 s (the depth range of 30—34 km). (iv) In the southeastern uplift, the two-way travel time of Moho interface ranges within 9.7—10.4 s (the depth range of 30—32 km). The poststack migration sections manifest the peculiar phenomenon of the disconnecting Moho reflection phases in Songliao Basin with two-way travel time difference of 0.1—0.5 s (2 km or so). In the vicinity of disconnecting zone, there are several shear faults, which are wide within the uplifting zone and become narrow at the intersection of two uplifting zones. It can be inferred that these reflection images and peculiar reflections from Moho interface are attributed to the coupling of the following dynamic factors: multi-phase weak collision of Heilongjiang micro-continents, westward under-thrusting of Pacific plate and so on. 展开更多
关键词 Songliao Basin UPLIFTING zone nearly vertical reflection seismic probing disconnecting ZONE of MOHO interface.
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