Universität zu Köln

Hoffmann, Goesta, Schneider, Bastian, Mechernich, Silke ORCID: 0000-0003-3684-040X, Falkenroth, Michaela ORCID: 0000-0003-1705-1085, Dunai, Tibor and Preusser, Frank (2020). Quaternary uplift along a passive continental margin (Oman, Indian Ocean). Geomorphology, 350. AMSTERDAM: ELSEVIER. ISSN 1872-695X

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Abstract

Crustal movement along the coastline of the Arabian Sea in Oman is quantified along a 72 km long coastal section characterised by staircases of marine terraces. An extensive topographic, geomorphological and geological survey was conducted on these terraces and an age model based on cosmogenic nuclide (Be-10, Cl-36) and optically stimulated luminescence dating is presented, together with a new approach to extract palaeo-shorelines from a high-resolution digital elevation model. The uplifting crustal block is fault bounded and is composed of obduction related peridotites overlain by shallow marine limestone. Nine distinct terrace levels are identified and the results indicate continuous uplift between Marine Isotope Stage (MIS) 5a and MIS 19. The calculated uplift rates vary along the coastline and a northward tilting of the uplifted coastal block is interpreted as evidence for differential uplift. The geomorphology of the terraces proves that the tilting must have taken place after the last interglacial. Tectonic forcing of the uplift by a crustal forebulge associated with the Makran Subduction Zone is discussed. It is also concluded that the uplift involves processes of serpentinisation of the peridotites in combination with karstification of the overlying limestone formations. As water is essential for both processes, climate change during the Quaternary apparently played a significant role in the uplift process as well as hydro-isostasy. (C) 2019 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hoffmann, Goesta UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneider, Bastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Mechernich, Silke UNSPECIFIED orcid.org/0000-0003-3684-040X UNSPECIFIED Falkenroth, Michaela UNSPECIFIED orcid.org/0000-0003-1705-1085 UNSPECIFIED Dunai, Tibor UNSPECIFIED UNSPECIFIED UNSPECIFIED Preusser, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-345902
DOI:	10.1016/j.geomorph.2019.106870
Journal or Publication Title:	Geomorphology
Volume:	350
Date:	2020
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1872-695X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SEA-LEVEL; MARINE TERRACES; COASTAL EVOLUTION; SUBDUCTION ZONE; NORTHERN OMAN; QUARTZ; SINGLE; BE-10; RATES; MOUNTAINS Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/34590