P. Brotzu

University of Naples Federico II

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Leone Melluso

University of Naples Federico II

L. Morbidelli

Sapienza University of Rome

Excelso Ruberti

Universidade de São Paulo

Celso B. Gomes

Universidade de São Paulo

Vincenzo Morra

University of Naples Federico II

G. Traversa

Sapienza University of Rome

Michele Lustrino

Sapienza University of Rome

Luigi Beccaluva

University of Ferrara

Colombo Celso Gaeta Tassinari

Universidade de São Paulo

E. M. Piccirillo

University of Trieste

Cooperative Institutions

University of Naples Federico II

Sapienza University of Rome

Universidade de São Paulo

Instituto de Geociencias

University of Catania

Institute of Environmental Geology and Geoengineering

Terra

Istituto Nazionale di Geofisica e Vulcanologia

University of Cagliari

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

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Basaltic volcanism in the northern sector of the main Ethiopian rift

Journal of Volcanology and Geothermal Research (1981)

P. Brotzu M.T. Ganzerli-Valentini L. Morbidelli E. M. Piccirillo R. Stella

Rift zone

Escarpment

Flood basalt

Alkali basalt

Lile

Rift valley

10.1016/0377-0273(81)90086-x

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Citations (20)

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

Chemical Geology (2012)

Vincenza Guarino Fu Yuan Wu Michele Lustrino Leone Melluso P. Brotzu

Phlogopite

Phenocryst

Porphyritic

Petrogenesis

Large igneous province

10.1016/j.chemgeo.2012.06.016

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Citations (77)

Petrogenesis of the Early Cenozoic potassic alkaline complex of Morro de São João, southeastern Brazil

Journal of South American Earth Sciences (2007)

P. Brotzu Leone Melluso L. Bennio Celso B. Gomes Michele Lustrino

Nepheline

Nepheline syenite

Fractional crystallization (geology)

Petrogenesis

Incompatible element

10.1016/j.jsames.2007.02.006

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Citations (56)

Fractional Crystallization and Liquid Immiscibility Processes in the Alkaline-Carbonatite Complex of Juqui (S o Paulo, Brazil)

Journal of Petrology (1992)

Luigi Beccaluva M. Barbieri H. J. Born P. Brotzu Massimo Coltorti

Journal Article Fractional Crystallization and Liquid Immiscibility Processes in the Alkaline-Carbonatite Complex of Juquiá (São Paulo, Brazil) Get access L. BECCALUVA, L. BECCALUVA 1Istituto di Mineralogia Universita di Ferrara, C.so Ercole I'D'Este 32, 44100 Ferrara, Italy Search for other works by this author on: Oxford Academic Google Scholar M. BARBIERI, M. BARBIERI 2Dipartimento di Scienze della Terra, Universita di Roma, Roma, Italy Search for other works by this author on: Oxford Academic Google Scholar H. BORN, H. BORN 3Escola Politécnica, Uiversidade de São paulo, Brazil Search for other works by this author on: Oxford Academic Google Scholar P. BROTZU, P. BROTZU 4Departmento di Scienze della Terra, UniversitÀ di Cagliari, Cagliari, Italy Search for other works by this author on: Oxford Academic Google Scholar M. COLTORTI, M. COLTORTI 1Istituto di Mineralogia Universita di Ferrara, C.so Ercole I'D'Este 32, 44100 Ferrara, Italy Search for other works by this author on: Oxford Academic Google Scholar A. CONTE, A. CONTE 2Dipartimento di Scienze della Terra, Universita di Roma, Roma, Italy Search for other works by this author on: Oxford Academic Google Scholar C. GARBARINO, C. GARBARINO 5Istituto di Giacimenti Minerari, Università di Cagliari, Cagliari, Italy Search for other works by this author on: Oxford Academic Google Scholar C.B. GOMES G., C.B. GOMES G. 6Instituto de Geociência, Universidade de sāo Paulo, Brazil Search for other works by this author on: Oxford Academic Google Scholar ACCIOTTA M., ACCIOTTA M. 7Dipartimento di Scienze della Terra, Universitá di Cagliari, Cagliari, Italy Search for other works by this author on: Oxford Academic Google Scholar L. MORBIDELLI, L. MORBIDELLI 2Dipartimento di Scienze della Terra, Universita di Roma, Roma, Italy Search for other works by this author on: Oxford Academic Google Scholar ... Show more E. RUBERTI, E. RUBERTI 6Instituto de Geociência, Universidade de sāo Paulo, Brazil Search for other works by this author on: Oxford Academic Google Scholar F. SIENA, F. SIENA 1Istituto di Mineralogia Universita di Ferrara, C.so Ercole I'D'Este 32, 44100 Ferrara, Italy Search for other works by this author on: Oxford Academic Google Scholar G. TRAVERSA G. TRAVERSA 8Dipartimento di Scienze della Terra, Università di Perugia, Perugia, Italy Search for other works by this author on: Oxford Academic Google Scholar Journal of Petrology, Volume 33, Issue 6, December 1992, Pages 1371–1404, https://doi.org/10.1093/petrology/33.6.1371 Published: 01 December 1992 Article history Received: 05 March 1991 Accepted: 31 March 1992 Published: 01 December 1992

Carbonatite

10.1093/petrology/33.6.1371

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Citations (75)

Stable-isotope geochemistry of Hercynian granitoid rocks from the Sarrabus massif (southeastern Sardinia, Italy)

Chemical Geology (1983)

P. Brotzu Vincenzo Ferrini Umberto Masi

Massif

δ18O

Mineral redox buffer

10.1016/s0009-2541(83)80007-2

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Citations (11)

The Pariquera Açu K-alkaline complex and southern Brazil lithospheric mantle source characteristics

Journal of Asian Earth Sciences (2000)

L. Morbidelli Celso B. Gomes P. Brotzu S. D’Acquarica Carlo Garbarino

Carbonatite

Nepheline

Ultramafic rock

Peralkaline rock

Nepheline syenite

Metasomatism

10.1016/s1367-9120(99)00028-0

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Citations (26)

Petrogenesis of the Late Cretaceous tholeiitic magmatism in the passive margins of northeastern Madagascar

Geological Society of America eBooks (2002)

Leone Melluso Vincenzo Morra P. Brotzu Massimo D’Antonio L. Bennio

New chemical and Sr-Nd isotopic data on the Late Cretaceous mafic dike swarm intruding the Archean-Proterozoic crystalline basement in the Tamatave-Sainte Marie Island sector (northeast coast passive margin), and on lavas and dikes of the northeastern part of the Mahajanga sedimentary basin (passive margin after the opening of the Jurassic-Cretaceous Somali basin), allow better knowledge of the chemical variations observed in the northern part of the Madagascan igneous province. Two distinct basalt groups have been identified. Group 1 basalts have low light to heavy rare earth element (REE) ratios [(La/Yb) n = 2.2-2.9], low Zr/Y and Nb/Y (4-6 and 0.2-0.4, respectively), low ( 87 Sr/ 86 Sr) 88 (0.7034-0.7042), and high to moderate e Nd (88) (+5.1 to +1.5). Subgroup la comprises basalts with the same light to heavy REE ratios [(La/Yb)n = 2.7-3], Zr/Y and Nb/Y (4.5-5.8 and 0.2-0.3, respectively), and slightly high ( 87 Sr/ 86 Sr) 88 (0.7042-0.7048) at the same e Nd (88) (+5.4 to +4.4) of the group 1 basalts. Group 2 basalts have high light to heavy REE ratios [(LaNb) n = 5.3-7.8], high Zr/Y and Nb/Y (7-11 and 0.5-0.8, respectively), relatively high ( 87 Sr/8 6 Sr) 88 (0.7045-0.7057), and low e Nd (88) (+3.8 to +1). The basalts of the groups 1, la, and 2 cannot be linked by closed-system magma-differentiation processes, and require distinct mantle sources. The major and trace element variations of the Tamatave dikes of the group 1-la are compatible with moderate degrees of crystal fractionation (∼60%) from the least (MgO = 7.3 wt%) to the most evolved compositions (MgO = 4.2 wt%), involving the separation of plagioclase, augite, pigeonite, and minor oxides, perhaps accompanied by crustal contamination or differences in the 87 Sr/ 86 Sr ratios. The mantle sources of the group 1-la basalts seem to be located well within the spinel stability field, whereas a larger contribution of melts derived from garnet-bearing residual mantle is observed in the geochemistry and in the melting models of the group 2 basalts. The chemical and isotopic composition of both rock groups indicate their ultimate provenance from variably enriched lithospheric mantle sources; there is no clear evidence of a hotspot component like that found in the present-day lavas of the Marion-Prince Edward archipelago. The sources of this volcanism seem to be significantly similar to those of the Mahableshwar and Ambenali basalts of the later erupted Deccan Traps, located on formerly contiguous parts of the Gondwana lithosphere.

Petrogenesis

10.1130/0-8137-2362-0.81

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Citations (17)

Magmatism and fenitization in the Cretaceous potassium-alkaline-carbonatitic complex of Ipanema São Paulo State, Brazil

Mineralogy and Petrology (2011)

Vincenza Guarino Rogério Guitarrari Azzone P. Brotzu Celso B. Gomes Leone Melluso

Carbonatite

Lithology

10.1007/s00710-011-0168-4

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Citations (24)

The Cenozoic alkaline magmatism in central-northern Madagascar: A brief overview

Leone Melluso Vincenzo Morra P. Brotzu Luigi Franciosi Celestino Grifa

The Cenozoic volcanic rocks of Madagascar were emplaced as lavas, pyroclastic rocks, dykes, and plugs, and range in composition from olivine melilitites, basanites and alkali basalts, to phonolites, trachytes and rhyolites. The ultrabasic- basic lithologies are dominant, in particular basanites and tephrites, with less abundant, mildly evolved, compositions. These rocks form at least three different magma lineages of broadly sodic affinity. Fractional crystallization of the observed phenocryst phases is the most reasonable petrogenetic model for the genesis of the more evolved compositions. The mantle-derived magmas were likely generated by variable degrees of partial melting of incompatible element-enriched mantle sources, possibly located in the deep lithosphere or in the asthenosphere. riassunto. — Le rocce vulcaniche Cenozoiche del Madagascar, a giorno come colate di lava, rocce piroclastiche e sciami di filoni, variano in composizione da termini ultrabasici (olivin melilititi) fino a basici (basaniti, tefriti, alcali basalti, hawaiiti) ed evoluti (trachiti, fonoliti, rioliti). Basaniti e tefriti sono dominanti. Queste rocce formano almeno tre serie magmatiche con diverso grado di sottosaturazione in silice e con affinita magmatica di tipo sodico o piu raramente potassico. La cristallizzazione frazionata e il processo petrogenetico piu probabile che ha portato alla formazione delle rocce evolute delle varie serie. I differenti magmi parentali sembrano essersi formati per variabili gradi di fusione parziale di sorgenti geochimicamente arricchite e probabilmente ricche in elementi volatili, questi ultimi localizzati in fasi quali anfiboli, flogopite e carbonati. Queste sorgenti sono probabilmente parti della litosfera continentale piu profonda o dell'astenosfera.

Fractional crystallization (geology)

Phenocryst

Incompatible element

Magma chamber

10.2451/2007pm0023

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Citations (27)

The Cretaceous Igneous Province of Madagascar: Geochemistry and Petrogenesis of Lavas and Dykes from the Central–Western Sector

Journal of Petrology (2001)

Leone Melluso Vincenzo Morra P. Brotzu John J. Mahoney

The Cretaceous lava sequence and associated mafic dyke swarm in central–western Madagascar (Mailaka and Bemaraha areas) range in composition from picrite basalts to cordierite–orthopyroxene-bearing rhyodacites (MgO from 14 to 0·6 wt %). Petrographic and chemical data indicate the presence of both tholeiitic and transitional magma series, with variable degree of rare earth element enrichment [(La/Nd)n = 1–1·4 for tholeiites vs (La/Nd)n = 0·65–1 for transitional rocks]. Initial (at 88 Ma) 87Sr/86Sr and εNd range from 0·7044 to 0·7046 and −1·6 to −3·0 in the tholeiitic picrite basalts and basalts, and from 0·7030 to 0·7043 and +7·6 to +3·7 in the transitional picrite basalts and basalts. The rhyodacites have (87Sr/86Sr)88 = 0·7155 and εNd(88) = −10·6. Fractional crystallization of the observed phenocryst phases, starting from the most primitive tholeiitic basalts, combined with moderate amounts of contamination by peraluminous melts derived from partial melting of metapelitic basement rocks, explains the chemical composition of the rhyodacites reasonably well. The different parental magmas of the two series were probably generated by low degrees of partial melting (2·5–5%) of a depleted source (transitional basalts), and higher degrees of partial melting (5–7%) of a source very slightly enriched with a crustally derived component (tholeiitic basalts). Comparison between the samples from the eastern and northern parts of the province indicates that several different parental magmas and mantle sources were involved in the petrogenesis of the Madagascan basalts, and that contributions from mantle chemically equivalent to the modern Marion hotspot were negligible, overall.

Petrogenesis

Fractional crystallization (geology)

Flood basalt

Silicic

10.1093/petrology/42.7.1249

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Citations (48)