The petrogenetic association of carbonatite and alkaline magmatism: constraints from the Masfut-Rawda Ridge, Northern Oman Mountains |
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Authors: | S Nasir S Hanna S Hajari |
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Institution: | (1) Department of Geology, The University of Qatar, Doha, Qatar, QA;(2) Department of Earth Sciences, Sultan Qaboos University, Al-Khod, Oman, OM |
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Abstract: | Summary ?A new occurrence of carbonatites associated with intrusive ijolite and syenite has been discovered within the Hawasina Complex
underlying the Semail Ophiolite Complex at the southern part of the Rawda-Masfut ridge, Northern Oman Mountains. The carbonatites
occur as dikes and sills with lengths of several hundreds of meters and range in composition from calciocarbonatites to ferruginous
calciocarbonatites. The carbonatites intruded the ijolite and the associated radiolarian cherts of the Early Cretaceous Sid’r
Formation. The close spatial association of carbonatite, ijolite, syenite and radiolarian cherts along with geological, petrographical
and geochemical data indicates that these rocks are of intra-oceanic origin. Petrological and field relationships between
the carbonatite and associated alkaline silicate intrusives from the Masfut area are consistent with the carbonatites being
generated as derivative magmas through liquid immiscibility. They appear to represent magmas related to the volcanism associated
with regional crustal extension that preceded the genesis of the Semail Ophiolite.
Received April 19, 2001; revised version accepted February 18, 2002 |
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