Late Paleocene to Miocene compression in the Faeroe–Rockall area
Late Paleocene to Miocene compression in the Faeroe–Rockall area
复制标题
法罗-罗科尔地区古新世晚期至中新世挤压
DOI：
10.1144/0041025
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
M. Andersen
中科院分区：
文献类型：
--
作者：
L. O. Boldreel;M. Andersen
在费罗-罗科尔地区的几个地点观察到了挤压结构。其中之一，怀维尔-汤姆森山脊综合体，是苏格兰-格陵兰山脊的一部分，形成了从挪威海向南流动的深而冷的北极水的屏障。对地震多道反射剖面的解释表明，Wyville-Thomson山脊杂岩是挤压的结果，Ymir山脊和Wyville-Thomson山脊是与向北倾斜的断层面相连的斜坡背斜。一些小隆起被杂岩南侧的反向断层抵消，解释为与山脊杂岩的构造演化有关的前陆逆冲褶皱。至少识别出三个始新世至中新世挤压相。第一次发生在古新世晚期-始新世早期，第二次发生在渐新世。这些挤压阶段与东北大西洋海底扩张几何形状的显著变化相吻合。第三阶段为中新世中晚期，可能与冰岛复杂的中新世扩张史有关。
Compressional structures are observed at several locations in the Faeroe–Rockall Area. One of these, the Wyville–Thomson Ridge Complex, is part of the Scotland–Greenland Ridge which forms a barrier to the south-flowing deep cold arctic water from the Norwegian Sea. Interpretation of seismic multichannel reflection profiles suggests that the Wyville–Thomson Ridge Complex is the result of compression and that the Ymir Ridge and the Wyville–Thomson Ridge are ramp anticlines connected with a fault plane dipping to the north. A number of small highs offset by reverse faults to the south of the complex are interpreted as foreland thrust folds developed in relation to the tectonic evolution of the ridge complex. At least three Eocene to Miocene compressional phases are recognized. The first took place in late Paleocene–early Eocene and the second in Oligocene times. These compressional phases coincide with pronounced changes in the sea floor spreading geometry in the NE Atlantic. The third phase, in the middle or late Miocene, may possibly be associated with the complex Miocene spreading history of Iceland.