The carbonatite-marble dykes of Abyan Province, Yemen Republic: the mixing of mantle and crustal carbonate materials revealed by isotope and trace element analysis
Le Bas, M.J., Ba-bttat, M.A.O., Taylor, R.N., Milton, J.A., Windley, B.F. and Evins, P.M. (2004) The carbonatite-marble dykes of Abyan Province, Yemen Republic: the mixing of mantle and crustal carbonate materials revealed by isotope and trace element analysis. Mineralogy and Petrology, 82, (1-2), 105-135. (doi:10.1007/s00710-004-0056-2).
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Dykes of carbonate rocks, that cut gneisses in the Lowder-Mudiah area of southern Yemen, consist of dolomite and=or calcite with or without apatite, barite and monazite. Petrographic observations, mineralogical, XRF and ICP-MS analyses reveal that some of the carbonate rocks are derived from sedimentary protoliths, whereas others are magmatic calcio- and magnesio-carbonatites some of which are mineralized with barite-monazite. The interbanded occurrence and apparent contemporary emplacement of these different rock types within individual dykes, backed by Sr–Nd isotope evidence, are interpreted to show that intrusion of mantle-derived carbonatite magma was accompanied by mobilization of crustal marbles. That took place some 840 Ma ago but the REE-mineralization is dated at ca. 400 Ma.
|Subjects:||Q Science > QE Geology|
|Divisions:||University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
University Structure - Pre August 2011 > National Oceanography Centre (NERC)
|Date Deposited:||31 May 2005|
|Last Modified:||22 Aug 2013 13:16|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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