A Transitional Basalt-Pantellerite Sequence of Fractional Crystallization, the Boina Centre (Afar Rift, Ethiopia)

Barberi, F.; Ferrara, G.; Santacroce, Roberto; Treuil, M.; Varet, Jacques

doi:10.1093/petrology/16.1.22

Cited by 273 publications

(118 citation statements)

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“…Trace-element analyses of igneous rock series related by crystal fractionation have allowed identification of some elements for which the bulk solid-liquid partition coefficient is very close to zero (Barberi et al, 1975, Weaver et al, 1972. Varet and Treuil (1973) term such elements hygromagmatophile, a term intended to convey not simple rejection by solid phases, but positive acceptance by the liquid.…”

Section: Previous Geochemical Workmentioning

confidence: 99%

Mantle Heterogeneity in the North Atlantic: Evidence from Leg 49 Geochemistry

Cann¹,

Tarney²,

Varet³

et al. 1979

Initial Reports of the Deep Sea Drilling Project, 49

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Section: Previous Geochemical Workmentioning

confidence: 99%

Mantle Heterogeneity in the North Atlantic: Evidence from Leg 49 Geochemistry

Cann¹,

Tarney²,

Varet³

et al. 1979

Initial Reports of the Deep Sea Drilling Project, 49

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“…Analyses recalculated to 100% on a water-free basis. The dashed curve reproduces compositional variations of rocks from the Boina centre, Afar [Barberi et al, 1975]. The hatched field corresponds to comendites from the Primavera caldera, Jalisco [Mahood, 1981].…”

Section: Peralkaline Volcanism and The Opening Of The Gulf Of Californiamentioning

confidence: 99%

“…Scaillet and Macdonald, 2001;Peccerillo et al, 2003 and references therein]. An origin through fractional crystallization of mildly alkalic to transitional basalts, as exposed in the pioneer works on the Afar rift, Ethiopia [Barberi et al, 1974[Barberi et al, , 1975Bizouard et al, 1976Bizouard et al, , 1980, is a popular model that seems to apply in many cases, either in continental [e.g. Gasparon et al, 1993;Civetta et al, 1998] or oceanic environments [e.g.…”

Section: Introductionmentioning

confidence: 99%

Isotope geochemistry and petrogenesis of peralkaline Middle Miocene ignimbrites from central Sonora: relationship with continental break-up and the birth of the Gulf of California

Vidal-Solano

Lapierre

Stock

et al. 2008

Bulletin De La Société Géologique De France

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Abstract. -Middle Miocene peralkaline ignimbrites constitute a specific geodynamic marker of the early stage of opening of the Gulf of California, preserved either in central Sonora or the Puertecitos area, in Baja California. Very uniform ages (12-12.5 Ma) obtained on these rocks show that this volcanic episode corresponds to a specific stage in the tectonic evolution of the proto-gulf area. Field observations and slightly different Sr and Nd isotopic signatures support eruptions from several small volume magma batches rather than from a large-volume caldera forming event. Isotopic ratios help to constrain the petrogenesis of the peralkaline liquids by fractional crystallization of transitional basalts in a shallow reservoir, with slight contamination by Precambrian upper crustal material. Less differentiated glomeroporphyritic icelandites erupted at about 11 Ma, mark an increase in the magma production rate and highlight an easier access to the surface, illustrating an advanced stage in the weakening of the continental crust. The tilting of the Middle Tertiary sequences results from a major change in the tectonic regime, from E-W extension giving rise to N-S grabens, to NNW-SSE strike-slip motion that can be related to the transfer of Baja California from North America to the Pacific plate. The location of peralkaline volcanism coincides with the southern edge of the Precambrian crust and the southernmost extension of the California slab window at 12.5 Ma. Géochimie isotopique et pétrogenèse des ignimbrites hyperalcalines du Miocène moyen du Sonora central : relations avec la déchirure continentale et la naissance du golfe de CalifornieMots-clés. -Ignimbrites hyperalcalines, Miocène moyen, Géochimie isotopique, Golfe de Californie.Résumé. -Les ignimbrites hyperalcalines du Miocène moyen constituent un excellent marqueur du stade initial de l'ouverture du golfe de Californie. Elles sont préservées aussi bien en Sonora central que sur la marge orientale de la pénin-sule de Basse Californie, dans la région de Puertecitos. Les âges uniformes obtenus sur ces roches (12.5-12 Ma) montrent que cet épisode volcanique correspond à un stade spécifique de l'évolution du golfe de Californie. Les données de terrain, ainsi que les données isotopiques, indiquent que les ignimbrites correspondent à plusieurs venues de faibles volumes, plutôt qu'à une éruption majeure se terminant par un effondrement en caldera. Les données isotopiques permettent en outre de préciser que les ignimbrites sont le résultat de processus de cristallisation fractionnée à partir de basaltes transitionnels, avec une faible contamination par la croûte supérieure précambrienne. Les laves vitreuses gloméroporphyriques de 11 Ma (islandites) témoignent d'une production magmatique plus importante et d'un accès plus aisé vers la surface, en relation sans doute avec une croûte continentale plus amincie. Le basculement des séquences du Miocène moyen et supérieur témoigne d'un changement majeur du champ de contrainte, depuis une extension E-W à l'origine de grab...

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“…Excluding the oceanic setting, such as propagating spreading centers at mid-ocean ridges (Clague et al, 1981;Perfit and Fornari, 1983;Sinton et al, 1983) and in back-arc basins (Pearce et al, 1994;Harper, 2003), several studies have demonstrated that high Fe-Ti basic igneous rocks are also generated in continental settings, such as in the Afar Rift of Ethiopia (Barberi et al, 1975) and in the northern and southern sections of the Red Sea Rift (Juteau et al, 1983;Cocherie et al, 1994). Moreover, most of the Fe-Ti-rich compositions are found in plutonic environments and only rare cases are known for erupted rocks (Clague et al, 1981;Perfit and Fornari, 1983;Sinton et al, 1983;Hunter and Sparks, 1987;Pearce et al, 1994;Hooper, 2000;Harper, 2003;Zhang et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…) and back-arc spreading centers (Christie and Sinton, 1981;Pearce et al, 1994) in oceanic environments, and to rift (Barberi et al, 1975;Juteau et al, 1983;Cocherie et al, 1994) and mantle plume (Ripley et al, 1998;Duchesne and Charlier, 2005;Higgins, 2005;Upton et al, 2005;Zhou et al, 2005;Tegner et al, 2006;Namur et al, 2010) settings in the continental regime. In view of the fact that all high Fe-Ti gabbros were intruded into ∼2.55 Ga TTG gneisses, this implies a continental environment for their generation in western Shandong.…”

mentioning

confidence: 99%