کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4693919 1636890 2009 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Lower crustal composition and crustal lineaments on the Vøring Margin, NE Atlantic: A review
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Lower crustal composition and crustal lineaments on the Vøring Margin, NE Atlantic: A review
چکیده انگلیسی

A prominent lower crustal high-velocity layer observed in the Vøring Basin, NE Atlantic, has been investigated with regard to composition and spatial link to crustal-scale lineaments. In the southernmost part of the basin the lower crustal layer is interpreted as eclogites, based on anomalously high P-wave velocities (8.4 km/s). In the remainder of the basin the layer is preferably interpreted as mafic intrusions emplaced during the last phase of rifting, but it cannot be excluded that the body consists of older (Caledonian?), mafic rocks. Direct link with high-grade Caledonian rocks to the east, and westwards to east Greenland, cannot be made, since these rocks are mainly of felsic composition. The crustal-scale lineaments inferred from wide-angle seismic data appear to represent the oceanward extension of post-Caledonian detachments. The spatial variation in the thickness of the layer is within the late-rifting magmatic hypothesis partly interpreted in terms of (pre-magmatic) variations in thickness of the lithosphere. In addition, lateral variations in extension, mantle upwelling and decompressional melting during the last phase of rifting may also have contributed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volume 472, Issues 1–4, 1 July 2009, Pages 183–193
نویسندگان
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