Unknown
Chapman & Hall
In:
In: Sedimentation and tectonics in rift basins - Red Sea - Gulf of Aden. , ed. by Purser, B. H. and Bosence, D. W. J. Chapman & Hall, London, UK, pp. 583-594. ISBN 978-0-412-73490-8
Publication Date:
2020-03-16
Description:
Modem reefs in the Red Sea exhibit different controls on their formation. The majority of the reefs belong to the fringing type. These reefs grow close to the mainland and are abscnt in wadi mouths. Their arrangement and orientation are strongly controlled hy the siliciclastic input from the hinterland. In addition, discharge events due to ephemeral precipitation may cause local but serious damage of the reef-building assemblages. However, the gene;al pattern of reef arrangement follows the morphology of the coastline, which itself portrays the tectonic framework of the Red Sea. Barrier reefs and even atolls also occur, predominantly in the central and southern part of this young ocean. Both reef types show a strong control by the tectonic framework of riftrelated origin. The outlines of the reef crest and the orientation' of the foreslopes follow the tectonic pattern. Spectacular drop-ofTs are widespread and represent predominantly fault planes of horsts and graben structures parallel to the rift. Furthermore rift-related salt diapirism occurs, which influences reef shapes, indicated by circular and semicircular outlines. Besides these controls, sea-level changes are a trigger as weil. They are documented in onshore and ofsf hore terraces and their prescnt-day position can be attributed to the last glacial-interglacial cycle. These difefrent controls along with the two major reef types and their typical zonation patterns are discussed briefly.
Type:
Book chapter
,
NonPeerReviewed
Format:
text
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