کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4693740 1636877 2009 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nature of the Moho beneath the Scottish Highlands from a receiver function perspective
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Nature of the Moho beneath the Scottish Highlands from a receiver function perspective
چکیده انگلیسی

The geology of Scotland documents a protracted geological history from Precambrian basement formation through the Caledonian Orogeny and to the Tertiary opening of the Atlantic. A temporary deployment of 22 closely spaced broadband seismic stations in Scotland traverses many of the major terrane boundaries in the region and provides a unique opportunity to place spatial and temporal constraints on variations in crustal structure. With teleseismic P-wave receiver functions, we use the H − κ method to determine variations in bulk crustal parameters: crustal thickness (H) and VP/VS ratio. Mean crustal thickness is ~ 28 km, varying from ~ 23 km in the NE highlands and increasing to > 30 km near the Highland Boundary Faultin the southern part of the study area. Mean VP/VS values of ~ 1.76 show no significant variation across the study area. An abrupt increase in crustal thickness of ~ 4.5 km NW across the Moine Thrust is not easily linked to Tertiary–Recent tectonic activity. Instead it appears that Scotland's crust has retained features for hundreds of millions of years since it was first formed, despite abundant volcanic activity in Tertiary times. Our work favours the view that the Moho is a compositional boundary rather than a mineralogical one defined by a reaction in P–T space.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volume 479, Issues 3–4, 20 December 2009, Pages 214–222
نویسندگان
, , ,