The carbonatite-marble dykes of Abyan Province, Yemen Republic; the mixing of mantle and crustal carbonate materials revealed by isotope and trace element analysis

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doi: 10.1007/s00710-004-0056-2
Authors:Le Bas, M. J.; Ba-Bttat, M. A. O.; Taylor, R. N.; Milton, J. A.; Windley, B. F.; Evins, P. M.
Volume Title:Mineralogy and Petrology
Source:Mineralogy and Petrology, 82(1-2), p.105-135. Publisher: Springer-Verlag, Vienna, Austria. ISSN: 0930-0708
Publication Date:2004
Note:In English; illus., incl. 8 tables, geol. sketch map
Summary: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, baryte 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 baryte-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 ∼ 400 Ma. [H.P.B.]
Sections:Geochemistry; Petrology
Subsections:Igneous petrology; Igneous rocks
Subjects:Alkaline earth metals; Apatite; Barite; Carbonate rocks; Carbonatites; Crust; Dike swarms; Dikes; Electron probe data; Geochemistry; Igneous rocks; Intrusions; Isotope ratios; Isotopes; Mantle; Marbles; Metals; Metamorphic rocks; Mineral composition; Mixing; Monazite; Nd-144/Nd-143; Neodymium; Phosphates; Rare earths; Sedimentary rocks; Sr-87/Sr-86; Stable isotopes; Strontium; Sulfates; Arabian Peninsula; Asia; Yemen; Abyan Yemen
Coordinates:N123000 N183000 E0530000 E0423000
Abstract Numbers:05M/253
Record ID:2010046355
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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