Postglacial tectonic activity within the Skjalfandadjup Basin, Tjornes Fracture Zone, offshore Northern Iceland, based on high resolution seismic stratigraphy

TitlePostglacial tectonic activity within the Skjalfandadjup Basin, Tjornes Fracture Zone, offshore Northern Iceland, based on high resolution seismic stratigraphy
Publication TypeJournal Article
Year of Publication2015
AuthorsMagnusdottir S., Brandsdottir B., Driscoll N., Detrick R.
JournalMarine Geology
Volume367
Pagination159-170
Date Published2015/09
Type of ArticleArticle
ISBN Number0025-3227
Accession NumberWOS:000358389600012
Keywordsarchitecture; atlantic; earthquakes; evolution; Extensional-transform tectonics; High-resolution seismic; holocene; mechanism; plate boundary; pockmarks; reflection; rift; shelf sediments; Skjalfandadjup Basin; Tjornes Fracture Zone
Abstract

Multibeam bathymetric and high resolution seismic reflection data (Chirp) have been used to illuminate the structural framework and tectonic evolution of the 300 km(2) Skjalfandadjup Basin, one of three large rift basins within the Tjornes Fracture Zone, a complex transform zone offshore Northern Iceland. The Skjalfandadjup Basin together with the Nafir seamounts, form the nascent Nafir-Skjalfandadjup volcanic system of the oblique Grimsey Volcanic Zone. The Skjalfandadjup Basin is made up of normal faults with maximum displacement of 50-60 m and a dominant strike of N10-20 degrees W. Correlation of Chirp data with tephrochronology from sediment core MD99-2275 provided constraints on tectonic movements along individual faults from Late-glacial time throughout Holocene. Maximum vertical displacement is observed on three listric normal faults marking the eastern boundary of the main basin. Postglacial tectonic activity commenced as early as 14-15 kyr BP, followed by three major rifting episodes prior to 10 kyr BP and three smaller rifting episodes during the last 4.2 kyr. The 10-12 kyr period of enhanced tectonic activity was accompanied by eruptions within the Tjornes Fracture Zone. Isostatic rebound following rapid deglaciation caused rifting with significant vertical displacement on normal faults offshore N-Iceland. (C) 2015 Elsevier B.V. All rights reserved.

DOI10.1016/j.margeo.2015.06.004
Short TitleMar. Geol.
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