The carbonatite-marble dykes of Abyan Province, Yemen Republic: the mixing of mantle and crustal carbonate materials revealed by isotope and trace element analysis
The carbonatite-marble dykes of Abyan Province, Yemen Republic: the mixing of mantle and crustal carbonate materials revealed by isotope and trace element analysis
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.
105-135
Le Bas, M.J.
983cedef-8979-4757-a068-43eba648cd5f
Ba-bttat, M.A.O.
05cb6122-3c3e-466a-a7de-79651e189549
Taylor, R.N.
094be7fd-ef61-4acd-a795-7daba2bc6183
Milton, J.A.
9e183221-d0d4-4ddb-aeba-0fdde9d31230
Windley, B.F.
96d9411a-39a3-4d99-90eb-89342ab64ac6
Evins, P.M.
c878b314-96e9-43fe-9295-cb0ab51f3965
2004
Le Bas, M.J.
983cedef-8979-4757-a068-43eba648cd5f
Ba-bttat, M.A.O.
05cb6122-3c3e-466a-a7de-79651e189549
Taylor, R.N.
094be7fd-ef61-4acd-a795-7daba2bc6183
Milton, J.A.
9e183221-d0d4-4ddb-aeba-0fdde9d31230
Windley, B.F.
96d9411a-39a3-4d99-90eb-89342ab64ac6
Evins, P.M.
c878b314-96e9-43fe-9295-cb0ab51f3965
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), .
(doi:10.1007/s00710-004-0056-2).
Abstract
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.
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Published date: 2004
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Local EPrints ID: 15790
URI: http://eprints.soton.ac.uk/id/eprint/15790
ISSN: 0930-0708
PURE UUID: 40d4f58f-b5d0-473f-857b-d7dafd76d806
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Date deposited: 31 May 2005
Last modified: 16 Mar 2024 02:51
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Author:
M.J. Le Bas
Author:
M.A.O. Ba-bttat
Author:
B.F. Windley
Author:
P.M. Evins
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