Th-ree- And Nb-ta-accessory Minerals In Post-collisional Ediacaran Felsic Rocks From The Katerina Ring Complex (s. Sinai, Egypt): An Assessment For The Fractionation Of Y/nb, Th/nb, La/nb And Ce/pb In Highly Evolved A-type Granites

dc.creatorMoreno
dc.creatorJA; Molina
dc.creatorJF; Bea
dc.creatorF; Abu Anbar
dc.creatorM; Montero
dc.creatorP
dc.date2016
dc.date2016-12-06T18:29:23Z
dc.date2016-12-06T18:29:23Z
dc.date.accessioned2018-03-29T02:01:54Z
dc.date.available2018-03-29T02:01:54Z
dc.identifier1872-6143
dc.identifierLithos. ELSEVIER SCIENCE BV, n. 258, p. 173 - 196.
dc.identifier1872-6143
dc.identifierWOS:000378369200011
dc.identifier10.1016/j.lithos.2016.04.020
dc.identifierhttp://www-sciencedirect-com.ez88.periodicos.capes.gov.br/science/article/pii/S002449371630055X
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/319765
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1310531
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionThe relationships of Y/Nb, Th/Nb, La/Nb and Ce/Pb ratios in A-type felsic rocks from the Ediacaran Katerina Ring Complex, northernmost Arabian-Nubian Shield (ANS; S. Sinai, Egypt), are investigated in this work to understand their behavior during generation of highly evolved granitic magmas and to explore the nature of magma sources. Textural and compositional relationships of cognate Th-REE- and Nb-Ta-accessory minerals in Katerina felsic rocks show that chevkinite-group minerals (CGM), monazite, thorite, allanite and xenotime formed from residual liquids in quartz syenite porphyries, quartz monzonites and peralkaline granites, whereas in aluminous granites, allanite and monazite crystallized early, and thorite and columbite formed from residual liquids. Relationships of Y/Nb, Th/Nb, La/Nb and Ce/Pb ratios with Zr/Hf ratios in the aluminous granites and with Be abundances in the peralkaline granites suggest a decrease in La/Nb and Ce/Pb ratios in the former, and in Y/Nb and La/Nb ratios in the latter with crystallization progress. This contrasts with absence of systematic variations of Th/Nb and Ce/Pb ratios in the peralkaline compositions and of Y/Nb ratio in the aluminous ones. In this latter, Th/Nb ratio can present a significant decrease only in highly evolved compositions. An analysis of Y/Nb, Th/Nb, La/Nb and Ce/Pb relationships in worldwide 0113 and subduction-related magmatic suites reveals that A-type felsic rocks with (Th/Nb)(N) <1.3, (La/Nb)(N) <13, and (Ce/Pb)(N) >1 may have A(1)-type affinity, and those with (Th/Nb)(N) >2, (La/Nb)(N) >2, and (Ce/Pb)(N) <1 tend to present A(2)-type affinity. The crystal fractionation of Th-LREE- and Nb-Ta-accessory minerals and mixing of components derived from the two granite groups may cause deviations from these compositional limits that can be evaluated using constraints imposed by Th/Nb-La/Nb, Ce/Pb-Th/Nb and Ce/Pb-La/Nb relationships in OIB and subduction-related magmatic suites. Three mantle sources might have been involved in the Ediacaran alkaline magmatism from northernmost ANS that are chemically similar to those of (1) OIB suites, (2) subduction-related magmatic suites, and (3) carbonatite-metasomatized peridotites. In addition, compositions characterized by (Y/Nb)(N) >0.18, (Th/Nb)(N) >2, (La/Nb)(N) >2, (Ce/Pb)(N) <1, and crustal-like Nb/Ta ratios may point to a significant contribution of crustal sources. (C) 2016 Elsevier B.V. All rights reserved.
dc.description258
dc.description
dc.description173
dc.description196
dc.descriptionSpanish grants [CGL2013-40785-P, CGL2008-02864]
dc.descriptionAndalusian grant [RNM2163]
dc.descriptionFundacao de Amparo Pesquisa do Estado de Sao Paulo (FAPESP), Brazil [2014/04920-0]
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description
dc.description
dc.description
dc.languageEnglish
dc.publisherELSEVIER SCIENCE BV
dc.publisherAMSTERDAM
dc.relationLithos
dc.rightsfechado
dc.sourceWOS
dc.subjectA-type Magmatism
dc.subjectContinental Crust Source
dc.subjectMantle Source
dc.subjectAccessory Minerals
dc.subjectPost-collisional Magmatism
dc.subjectKaterina Ring Complex
dc.titleTh-ree- And Nb-ta-accessory Minerals In Post-collisional Ediacaran Felsic Rocks From The Katerina Ring Complex (s. Sinai, Egypt): An Assessment For The Fractionation Of Y/nb, Th/nb, La/nb And Ce/pb In Highly Evolved A-type Granites
dc.typeArtículos de revistas


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