Petrogenesis of a basalt-comendite-pantellerite rock suite: the Boseti Volcanic Complex (Main Ethiopian Rift)

Ronga, Fiorenzo; Lustrino, Michele; Marzoli, Andréa; Melluso, Leone

doi:10.1007/s00710-009-0064-3

Cited by 66 publications

(64 citation statements)

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“…Channel; Avanzinelli et al, 2004;Civetta et al, 1998;Berger et al, 2009;Ronga et al, 2010;Lustrino et al, 2012;White et al, 2012). In the Sulcis area, however, peralkaline rhyolites (found in the comendite type-locality) are genetically associated with subduction-related rocks as in few other cases worldwide (e.g., New Zealand, Papua New Guinea and southern Mongolia; Smith et al, 1977;Kovalenko et al, 2009;.…”

Section: As Proposed By Lustrino Et Al (2009) the Main Problem Withmentioning

confidence: 99%

Origin and evolution of Cenozoic magmatism of Sardinia (Italy). A combined isotopic (Sr–Nd–Pb–O–Hf–Os) and petrological view

Lustrino

Fedele

Melluso

et al. 2013

Lithos

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Origin and evolution of Cenozoic magmatism of Sardinia (Italy). A combined isotopic (Sr-Nd-Pb-O-Hf-Os) and petrological view, LITHOS (2013), doi: 10.1016/j.lithos.2013.08.022 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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Section: As Proposed By Lustrino Et Al (2009) the Main Problem Withmentioning

confidence: 99%

Origin and evolution of Cenozoic magmatism of Sardinia (Italy). A combined isotopic (Sr–Nd–Pb–O–Hf–Os) and petrological view

Lustrino

Fedele

Melluso

et al. 2013

Lithos

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“…Whole-rock analyses of all four (Table 1), and matrix glass analyses of three, were presented in Ronga et al (2010). The samples were selected to give a range of relationships between whole-rock, glass and phenocryst phases.…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

“…and Bariccia (2132 ma.s.l.). The volcanological history of Boseti has been described by Di Paola (1972), Brotzu et al (1974Brotzu et al ( , 1980 and Ronga et al (2010). Activity at Boseti started with the emplacement of Pleistocene pre-caldera volcanic rocks and eruptions from centres peripheral to the main activity.…”

Section: Geological Settingmentioning

confidence: 98%

“…1). Whilst arguing that the rhyolites were formed by prolonged fractional crystallisation of basalts, Ronga et al (2010) explained the absence of intermediate rocks as a result of physical discrimination during eruptive processes. Brotzu et al (1978).…”

Section: Geological Settingmentioning

confidence: 99%

“…Their peralkalinity indices (PI= mol. (Na 2 O+K 2 O)/Al 2 O 3 ) range from 1.22 to 1.84 (Ronga et al 2010) and according to the classification scheme of Macdonald (1974a), they are pantellerites.…”

Section: Petrography and Nomenclaturementioning

confidence: 99%

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Evidence for extreme fractionation of peralkaline silicic magmas, the Boseti volcanic complex, Main Ethiopian Rift

et al. 2011

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Matrix glass and melt inclusions in phenocrysts from pantellerite lavas of the Boseti volcanic complex, Ethiopia, record extreme fractionation of peralkaline silicic magma, with Al 2 O 3 contents as low as 2.3 wt.%, FeO* contents up to 17 wt.% and SiO 2 contents~65 wt.%. The new data, and published data for natural and experimental glasses, suggest that the effective minimum composition for peralkaline silicic magmas has~5 wt.% Al 2 O 3 , 13 wt.% FeO* and 66±2 wt.% SiO 2 . The dominant fractionating assemblage is alkali feldspar + fayalite + hedenbergite + oxides±quartz. Feldspar -melt relationships indicate that the feldspar is close to the minimum on the albiteorthoclase solid solution loop through the entire crystallization history. There is petrographic, mineralogical and geochemical evidence that magma mixing may have been a common process in the Boseti rhyolites.

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Late Cretaceous intraplate silicic volcanic rocks from the Lake Chad region: An extension of the Cameroon volcanic line?

Shellnutt

Lee

Torng³

et al. 2016

Geochem Geophys Geosyst

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Silicic volcanic rocks at Hadjer el Khamis, near Lake Chad, are considered to be an extension of the Cameroon volcanic line (CVL) but their petrogenetic association is uncertain. The silicic rocks are divided into peraluminous and peralkaline groups with both rock types chemically similar to within‐plate granitoids. In situ U/Pb zircon dating yielded a mean 206Pb/238U age of 74.4 ± 1.3 Ma indicating the magmas erupted ∼10 million years before the next oldest CVL rocks (i.e., ∼66 Ma). The Sr isotopes (i.e., ISr = 0.7021–0.7037) show a relatively wide range but the Nd isotopes (i.e., 143Nd/144Ndi = 0.51268–0.51271) are uniform and indicate that the rocks were derived from a moderately depleted mantle source. Thermodynamic modeling shows that the silicic rocks likely formed by fractional crystallization of a mafic parental magma but that the peraluminous rocks were affected by low temperature alteration processes. The silicic rocks are more isotopically similar to Late Cretaceous basalts identified within the Late Cretaceous basins (i.e., 143Nd/144Ndi = 0.51245–0.51285) of Chad than the uncontaminated CVL rocks (i.e., 143Nd/144Ndi = 0.51270–0.51300). The age and isotopic compositions suggest the silicic volcanic rocks of the Lake Chad region are related to Late Cretaceous extensional volcanism in the Termit basin. It is unlikely that the silicic volcanic rocks are petrogenetically related to the CVL but it is possible that magmatism was structurally controlled by suture zones that formed during the opening of the Central Atlantic Ocean and/or the Pan‐African Orogeny.

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Petrogenesis of a basalt-comendite-pantellerite rock suite: the Boseti Volcanic Complex (Main Ethiopian Rift)

Cited by 66 publications

References 59 publications

Origin and evolution of Cenozoic magmatism of Sardinia (Italy). A combined isotopic (Sr–Nd–Pb–O–Hf–Os) and petrological view

Origin and evolution of Cenozoic magmatism of Sardinia (Italy). A combined isotopic (Sr–Nd–Pb–O–Hf–Os) and petrological view

Evidence for extreme fractionation of peralkaline silicic magmas, the Boseti volcanic complex, Main Ethiopian Rift

Late Cretaceous intraplate silicic volcanic rocks from the Lake Chad region: An extension of the Cameroon volcanic line?

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