Caledonian sole thrust of central East Greenland: A crustal-scale Devonian extensional detachment?статья из журнала
Аннотация: Research Article| July 01, 1995 Caledonian sole thrust of central East Greenland: A crustal-scale Devonian extensional detachment? E. Hartz; E. Hartz 1Department of Geology, University of Oslo, Box. 1047, 0316 Oslo, Norway Search for other works by this author on: GSW Google Scholar A. Andresen A. Andresen 1Department of Geology, University of Oslo, Box. 1047, 0316 Oslo, Norway Search for other works by this author on: GSW Google Scholar Geology (1995) 23 (7): 637–640. https://doi.org/10.1130/0091-7613(1995)023<0637:CSTOCE>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation E. Hartz, A. Andresen; Caledonian sole thrust of central East Greenland: A crustal-scale Devonian extensional detachment?. Geology 1995;; 23 (7): 637–640. doi: https://doi.org/10.1130/0091-7613(1995)023<0637:CSTOCE>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Structural observations of the basement-cover contact in the Central Fjord region of the East Greenland Caledonides suggest Silurian to Devonian crustal thinning with top-to-the-east displacement of the cover sequence. The east-dipping, low-angle shear zone separating the Late Proterozoic (Eleonore Bay Group) to Lower Ordovician cover sequence from the underlying high-grade gneisses has previously been interpreted as the Caledonian sole thrust in the region, displacing the cover sequence toward the Caledonian foreland in the west. However, emplacement of younger, low greenschist facies rocks on top of Archean to Middle Proterozoic gneissic rocks across the shear zone instead favors an extensional origin. This interpretation is supported by ductile and brittle shear-sense indicators in the footwall formed under progressively lower temperature conditions, consistently showing top-to-the-east displacement. The cover sequence in the hanging wall is cut by numerous extensional faults. The inferred earliest fault set developed contemporaneously with the deposition of the unconformably overlying Devonian deposits, whereas the youngest set crosscut the entire Devonian stratigraphy. Neither of these late brittle extensional faults are found in the basement, suggesting that they merge with the extensional shear zone at depth. Collectively, these observations suggest that the Devonian basin formed as a supradetachment basin during collapse of the Caledonian orogen. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Год издания: 1995
Авторы: Ebbe H. Hartz, Arild Andresen
Издательство: Geological Society of America
Источник: Geology
Ключевые слова: Geological and Geochemical Analysis, High-pressure geophysics and materials, earthquake and tectonic studies
Открытый доступ: closed
Том: 23
Выпуск: 7
Страницы: 637–637