کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8907682 | 1635126 | 2018 | 73 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Imaging exhumed lower continental crust in the distal Jequitinhonha basin, Brazil
ترجمه فارسی عنوان
تصویربرداری پوسته قاره پایین تر را در حوضه یویتین منه، برزیل تخلیه می کند
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی
Twelve combined wide-angle refraction and coincident multi-channel seismic profiles were acquired in the Jequitinhonha-Camamu-Almada, JacuÃpe, and Sergipe-Alagoas basins, NE Brazil, during the SALSA experiment in 2014. Profiles SL11 and SL12 image the Jequitinhonha basin, perpendicularly to the coast, with 15 and 11 four-channel ocean-bottom seismometers, respectively. Profile SL10 runs parallel to the coast, crossing profiles SL11 and SL12, imaging the proximal Jequitinhonha and Almada basins with 17 ocean-bottom seismometers. Forward modelling, combined with pre-stack depth migration to increase the horizontal resolution of the velocity models, indicates that sediment thickness varies between 3.3â¯km and 6.2â¯km in the distal basin. Crustal thickness at the western edge of the profiles is of around 20â¯km, with velocity gradients indicating a continental origin. It decreases to less than 5â¯km in the distal basin, with high seismic velocities and gradients, not compatible with normal oceanic crust nor exhumed upper mantle. Typical oceanic crust is never imaged along these about 200â¯km-long profiles and we propose that the transitional crust in the Jequitinhonha basin is a made of exhumed lower continental crust.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of South American Earth Sciences - Volume 84, July 2018, Pages 351-372
Journal: Journal of South American Earth Sciences - Volume 84, July 2018, Pages 351-372
نویسندگان
A. Loureiro, P. Schnürle, F. Klingelhöfer, A. Afilhado, J. Pinheiro, M. Evain, F. Gallais, N.A. Dias, M. Rabineau, A. Baltzer, M. Benabdellouahed, J. Soares, R. Fuck, J.A. Cupertino, A. Viana, L. Matias, M. Moulin, D. Aslanian,