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

Autor:	Rex N. Taylor, M. A. O. Ba-bttat, M. J. Le Bas, Paul M. Evins, James A. Milton, B. F. Windley
Rok vydání:	2004
Předmět:	Dolomite Geochemistry Petrography chemistry.chemical_compound Geophysics chemistry Geochemistry and Petrology Carbonatite Carbonate rock Carbonate Sedimentary rock Protolith Geology Gneiss
Zdroj:	Mineralogy and Petrology. 82:105-135
ISSN:	1438-1168 0930-0708
DOI:	10.1007/s00710-004-0056-2
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b3e4e819d22990eb655a450b357cc3e5 https://doi.org/10.1007/s00710-004-0056-2 Zobrazit plný text záznamu Plný text ve formátu PDF