Geology of the Al Qua’a 1:100 000 map sheet, 100-9, United Arab Emirates

Farrant, A.R.; Price, S.J.; Merritt, J.E.; Merritt, J.W.; Leslie, A.; Jordan, C.J.. 2012 Geology of the Al Qua’a 1:100 000 map sheet, 100-9, United Arab Emirates. Nottingham, UK, British Geological Survey, 31pp.

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Abstract/Summary

This Sheet Description describes the Quaternary and solid geology of the Al Qua'a 1:100 000 scale geological map. The Al Qua'a district covers approximately about 1750 km2 in the southeast of the UAE along the border with Oman. This district spans the transition from the extensive sand sea of the Ramlat ar Rabbad in the west to the distal alluvial fan sediments of the Hili Formation along the border with Oman. The oldest rocks in the area are the fluvial sands and gravels of the Hili Formation, which probably overlie the Miocene Dam Formation at shallow depth. They represent the distal end of a large alluvial fan system that extends from the Hajar Mountains. Two distinct gravel units are recognised, reflecting different source areas. One comprises clasts derived largely from the Hamrat Duru Group rocks of Oman, whereas the second includes a more heterogeneous combination including Hamrat Duru and Oman-UAE ophiolite clasts. The alluvial fans pass into continental sabkhas underlain by distal fluvial sediments and deflated aeolian sand. In the far northwest, palaeodune sandstones of the Madinat Zayed Formation occur within some of the interdunes. The major part of the district consists of aeolian dunes which change in morphology in a south and south-easterly direction across the district. In the west, the low barchan dunes along the eastern fringe of the extensive Ramlat al Rabbad sand sea merge into more discrete elongate dune ridges separated by flat interdune sabkhas. These dune ridges are punctuated by mega-barchans and star dunes that rise up to 100 m above the surrounding interdunes.

Item Type:	Publication - Book
Programmes:	BGS Programmes 2010 > BGS Corporate
ISBN:	9780852727195
Funders/Sponsors:	Ministry of Energy United Arab Emirates
Additional Information. Not used in RCUK Gateway to Research.:	This item can be purchased from https://www.moenr.gov.ae/en/our-services/geological-reports/geological-reports.aspx
NORA Subject Terms:	Earth Sciences
Date made live:	31 Jul 2012 15:05 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/18763

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