کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5781773 1413898 2016 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
How to identify oceanic crust-Evidence for a complex break-up in the Mozambique Channel, off East Africa
ترجمه فارسی عنوان
چگونگی شناسایی پوسته اقیانوسی - شواهد برای شکستن پیچیدگی در کانال موزامبیک، خاموش شرق آفریقا
کلمات کلیدی
فاصله حاشیه، کانال موزامبیک، دیوی رید، پوسته اقیانوسی، ریتینگ، داده های لرزه ای بازتابی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی
Using new multichannel seismic profiles offshore northern Mozambique, we are able to identify distinct portions of stretched basement east of Davie Ridge. Two phases of deformation affecting the basement are observed, with the initial phase resulting in the formation of rotated fault blocks bounded by listric faults. Half-grabens are filled with wedge-shaped, syn-extensional sediments overlain by a prominent unconformity that northward merges with the top of highly reflective, mildly deformed basement, interpreted as oceanic crust. The second phase of deformation is associated with wrench faulting and probably correlates with the southward drift of Madagascar, which implies that the preceding phase affected basement generated or modified prior to the opening of the West Somali Basin. We conclude that the basement is unlikely to consist of normal oceanic crust and suggest that the first extensional phase corresponds to rifting between Madagascar and Africa. We find evidence for a wide area affected by strike-slip deformation, in contrast to the earlier proposed major single transform fault in the vicinity of Davie Ridge and suggest that the Mozambique Channel area to the north of Madagascar may be classified as an oblique rather than sheared margin.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volume 693, Part B, 14 December 2016, Pages 436-452
نویسندگان
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