U-Pb ages, Sr-Nd- isotope geochemistry, and petrogenesis of kimberlites, kamafugites and phlogopite-picrites of the Alto Paranaiba Igneous Province, Brazil

doi:10.1016/j.chemgeo.2012.06.016

	U-Pb ages, Sr-Nd- isotope geochemistry, and petrogenesis of kimberlites, kamafugites and phlogopite-picrites of the Alto Paranaiba Igneous Province, Brazil
	Guarino, Vincenza 1; Wu, Fu-Yuan 2; Lustrino, Michele 3,4; Melluso, Leone 1; Brotzu, Pietro 1; Gomes, Celso de Barros 5; Ruberti, Excelso 5; Gaeta Tassinari, Colombo Celso 5; Svisero, Darcy Pedro 5
刊名	CHEMICAL GEOLOGY
	2013-08-30
卷号	353 页码:65-82
关键词	Kimberlites Kamafugites Phlogopite-picrites U-Pb perovskite geochronology Sr-Nd perovskite isotopes Brazil
ISSN号	0009-2541
DOI	10.1016/j.chemgeo.2012.06.016
文献子类	Article
英文摘要	The kimberlites, kamafugites and phlogopite-picrites of Alto Paranaiba Igneous Province (APIP), southern Brazil, span a range between similar to 91 and 78 Ma with new in-situ, more tightly constrained U-Pb ages. The kimberlites show porphyritic texture with olivine xeno- and phenocrysts plus phlogopite, Fe-Ti-Cr oxides and perovskite microcrysts set in a carbonate-rich matrix. The kamafugites are feldspar-free rocks represented by ugandites and mafurites. Ugandites and mafurites are porphyritic and contain olivine and clinopyroxene phenocrysts in a fine-grained groundmass composed by clinopyroxene, perovskite, apatite, magnetite, phlogopite, leucite and/or analcime in ugandites, and by olivine, clinopyroxene, amphibole, phlogopite, perovskite, magnetite, kalsilite and Ba-zeolites in mafurites. Phlogopite-picrites have a pseudo-fluidal porphyritic texture with olivine phenocrysts and abundant phlogopite microcrysts in a groundmass composed by olivine, spinel, apatite, perovskite, calcite and rare garnet. New in-situ Sr and Nd isotopic data on perovskites (Sr-87/Sr-86(i) = 0.70467-0.70565 and Nd-143/Nd-144(i) = 0.51222-0.51233) fall within the known ranges of APIP rocks (Sr-87/Sr-86(i) = 0.70431-0.70686; Nd-143/Nd-144(i) = 0.51205-0.51280). The APIP magmas derived from a source assemblage made up of an old metasomatized mica-carbonate garnet lherzolite, that did not suffer interaction with convective mantle, nor with any hypothetical melts derived from a Trindade mantle plume. Geochemical modelling show that low degree melting (f = 0.5-2%) of such a source can produce compositions resembling the APIP rocks. The geochemical and isotopic composition of the magmas, the calculated degrees of partial melting, the composition of the calculated source and the absence of a hot spot track from Goias to Alto Paranaiba igneous provinces can be explained with the presence of chemically and mineralogically heterogeneous mantle sources that melted at different pressures. (c) 2012 Elsevier B.V. All rights reserved.
WOS关键词	TRINDADE MANTLE PLUME ; SAO-FRANCISCO CRATON ; ULTRAMAFIC LAMPROPHYRES ; SOUTH-AFRICA ; SE BRAZIL ; ALKALINE PROVINCE ; SYSTEM CAO-MGO-AL2O3-SIO2-CO2 ; CARBONATED PERIDOTITE ; LITHOSPHERIC MANTLE ; ULTRAPOTASSIC ROCKS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000324469400006
资助机构	Ateneo "La Sapienza" ; Ateneo "La Sapienza" ; Fondi per la Ricerca Dipartimentale ; Fondi per la Ricerca Dipartimentale ; FAPESP ; FAPESP ; Ateneo "La Sapienza" ; Ateneo "La Sapienza" ; Fondi per la Ricerca Dipartimentale ; Fondi per la Ricerca Dipartimentale ; FAPESP ; FAPESP ; Ateneo "La Sapienza" ; Ateneo "La Sapienza" ; Fondi per la Ricerca Dipartimentale ; Fondi per la Ricerca Dipartimentale ; FAPESP ; FAPESP ; Ateneo "La Sapienza" ; Ateneo "La Sapienza" ; Fondi per la Ricerca Dipartimentale ; Fondi per la Ricerca Dipartimentale ; FAPESP ; FAPESP
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/87222]
专题	中国科学院地质与地球物理研究所
通讯作者	Melluso, Leone
作者单位	1.Univ Naples Federico II, Dipartimento Sci Terra, I-80134 Naples, Italy 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Univ Roma La Sapienza, Dipartimento Sci Terra, I-00185 Rome, Italy 4.Univ Roma La Sapienza, Dipartimento Sci Terra, CNR, IGAG, I-00185 Rome, Italy 5.Univ Sao Paulo, Inst Geociencias, BR-05508 Sao Paulo, Brazil
推荐引用方式 GB/T 7714	Guarino, Vincenza,Wu, Fu-Yuan,Lustrino, Michele,et al. U-Pb ages, Sr-Nd- isotope geochemistry, and petrogenesis of kimberlites, kamafugites and phlogopite-picrites of the Alto Paranaiba Igneous Province, Brazil[J]. CHEMICAL GEOLOGY,2013,353:65-82.
APA	Guarino, Vincenza.,Wu, Fu-Yuan.,Lustrino, Michele.,Melluso, Leone.,Brotzu, Pietro.,...&Svisero, Darcy Pedro.(2013).U-Pb ages, Sr-Nd- isotope geochemistry, and petrogenesis of kimberlites, kamafugites and phlogopite-picrites of the Alto Paranaiba Igneous Province, Brazil.CHEMICAL GEOLOGY,353,65-82.
MLA	Guarino, Vincenza,et al."U-Pb ages, Sr-Nd- isotope geochemistry, and petrogenesis of kimberlites, kamafugites and phlogopite-picrites of the Alto Paranaiba Igneous Province, Brazil".CHEMICAL GEOLOGY 353(2013):65-82.