کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4735050 1640649 2015 23 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The search for onshore analogues for the offshore Upper Cretaceous Chalk of the North Sea
ترجمه فارسی عنوان
جستجو برای آنالوگ های دریایی برای کرتاسه کوهی دریای شمال دریای شمال
کلمات کلیدی
کرتاسه بالا، گچ، زمین شناسی دریایی ساحلی چشمانداز رویدادهای رسوبی، بخش لرزه ای، هوای کواترنر، مهندسی دریای شمال
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی

Suitable onshore analogues for offshore wind-farm turbine foundations in the Chalk of the North Sea would be invaluable. Such foundations require examples of near surface weathering illustrating both glacial and periglacial Quaternary processes as well as lithology and tectonic structure of the Chalk. From the Cenomanian to Early Campanian, the coast of East Yorkshire illustrates hard, high density, glacially eroded chalks similar to those found immediately offshore. Higher in the Campanian offshore East Yorkshire, younger, low density chalks, not present onshore, have been found (the Westermost Rough Member). In contrast, north Norfolk and its coastal cliffs provide examples of soft, high porosity, part glacially and part periglacially weathered chalks. Complex sedimentary structures seen in offshore seismic sections are similar to those on the French coast of the Pays de Caux. These coastal sections are compared with results from offshore wind farm ground investigations. Seismic sections illustrate Quaternary channels cutting into the Chalk and a landscape of hills and valleys similar to the onshore Wolds. High resolution 2D digital seismic sections, combined with cored boreholes, provide the evidence for applying the detailed Chalk lithostratigraphy to the offshore southern North Sea and illustrate the relationship between tectonic structure and sedimentation in the Chalk. The map for the offshore extension of Chalk provinces is revised, with Transitional Province lithologies typical of the Chiltern Hills and East Anglia, extending north-eastwards from Norfolk into the Dowsing Fault zone. Geotechnical properties are related to the buried offshore Chalk landscape as well as to Chalk lithostratigraphy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Proceedings of the Geologists' Association - Volume 126, Issue 2, April 2015, Pages 188–210
نویسندگان
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