East Greenland Ridge in the North Atlantic Ocean: An integrated geophysical study of a continental sliver in a boundary transform fault setting
East Greenland Ridge in the North Atlantic Ocean: An integrated geophysical study of a continental sliver in a boundary transform fault setting
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北大西洋东格陵兰海岭：边界转换断层环境中大陆条的综合地球物理研究
DOI：
10.1029/2007jb005536
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发表时间：
2008
影响因子：
--
通讯作者：
Y. Nishimura
中科院分区：
文献类型：
--
作者：
A. Døssing;T. Dahl;H. Thybo;R. Mjelde;Y. Nishimura
[1]格陵兰-塞尼亚断裂带(GSFZ)代表了北大西洋的一级板块构造特征。GSFZ定义了磁异常性质的突然变化，南部格陵兰和挪威盆地有明确的海底扩张异常，而北部Boreas盆地有模糊和微弱的磁异常。后一地区的板块构造演化存在很大的不确定性，包括位于格陵兰断裂带沿线的东格陵兰山脊的作用。2002年，海底地震仪和多道地震(MCS)联合测量获得了横跨东格陵兰海脊和沿东格陵兰海脊的两条相交的广角反射和重合MCS剖面。我们给出了综合反射地震解释、初至层析成像、二维运动射线追踪、全波振幅模拟和相交剖面重力模拟的结果。结果表明：(1)格陵兰盆地具有正常的洋壳速度结构；(2)东格陵兰海脊的速度结构为全陆型；(3)东格陵兰海脊在高度伸展的陆壳之上存在一个主要的断陷盆地省。结果进一步表明，部分蛇纹化地幔橄榄岩上方的超薄断裂陆壳带界定了东格陵兰海脊的NW边缘和向东北格陵兰边缘的过渡。
[1] The combined Greenland-Senja Fracture Zones (GSFZ) represent a first-order plate tectonic feature in the North Atlantic Ocean. The GSFZ defines an abrupt change in the character of magnetic anomalies with well-defined seafloor spreading anomalies in the Greenland and Norwegian basins to the south but ambiguous and weak magnetic anomalies in the Boreas Basin to the north. Substantial uncertainty exists concerning the plate tectonic evolution of the latter area, including the role of the East Greenland Ridge, which is situated along the Greenland Fracture Zone. In 2002, a combined ocean-bottom seismometer and multichannel seismic (MCS) survey acquired two intersecting wide-angle reflection and coincident MCS profiles across and along the East Greenland Ridge. We present the results of integrated reflection seismic interpretation, first-arrival tomography, 2D kinematic raytracing, full-wave amplitude modeling, and gravity modeling of the intersecting profiles. The results show that (1) the Greenland Basin is characterized by a normal oceanic crustal velocity structure, (2) the velocity structure of the East Greenland Ridge is of overall continental type, and (3) a major faulted basin province above highly extended continental crust exists to the NE of the ridge. The results further suggest that a zone of extremely thin and faulted continental crust above partially serpentinized mantle peridotite defines the NW edge of the East Greenland Ridge and the transition to the NE Greenland margin.
影响因子：
2.8
作者：
M. Voss;W. Jokat
通讯作者：
M. Voss;W. Jokat