Rare earth element and other trace element distribution, and the origin of the iblean magmas

Battaglia, M.; Cristofolini, Renato; Girolamo, P. Di; Stanzione, D.

doi:10.1016/0377-0273(76)90023-8

Cited by 10 publications

(3 citation statements)

References 27 publications

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“…Romano and Villari (1973), Battaglia et al (1976) and Carveni et al (1991) held that tholeiitic and alkalic volcanism alternated in time and stratigraphically more or less randomly. Carveni et al (1991) presented some field and chemical data of the Plio-Pleistocene volcanics to the north and northeast of our study area and concluded that alkaline basalts were erupted from the Miocene until the Pleistocene, predominantly along northeast-southwest and north-northeast/south-southwest-trending fractures, mainly to the east, whereas more voluminous tholeiites erupted from east-west fissures and only appeared in the Late Pliocene to early Pleistocene in the western part of the area of their study.…”

Section: Volcanism In the Iblean Mountains: A Review Of Previous Studiesmentioning

confidence: 96%

Evolution of the northwestern Iblean Mountains, Sicily: uplift, Plicocene/Pleistocene sea-level changes, paleoenvironment, and volcanism

Schmincke¹,

Behncke²,

Grasso³

et al. 1997

Geologische Rundschau

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The Late Miocene to Pleistocene evolution of the northwestern Iblean plateau (Sicily) is marked by a complex interplay of subaerial and submarine volcanism, subsidence and uplift, eustatic sea-level changes, and shallow-water carbonate and clay sedimentation. Volcanic activity occurred in distinct phases, differing drastically in volume, chemical composition, eruptive and depositional sites, and eruptive mechanisms. Six of the newly defined formations in the northwestern Iblean plateau are either entirely volcanic or contain significant amounts of volcanics. The eastern part of a shallow marine basin was filled completely by Late Pliocene tholeiitic lava flows (Militello Formation) that had advanced subaerially from the south-southeast. Lava deltas advanced southwestward on top of earlier pillow breccia debris flow deposits intertongued with soft Trubi marls and chalks. True submarine eruptions (Monte Caliella Formation) simultaneously produced densely packed pillow piles up to 250 m thick. Inferred water depths based on volcanologic and paleoecologic criteria of interbedded and overlying calcarenites agree well.Subsequent alkalic, more explosive Pleistocene volcanic eruptions (Poggio Vina Formation) changed from initially submarine to late subaerial indicating growth of edifices above sea level, sea-level rise, or land Subsidence by ca. 50 m. They and the latest Militello volcanics are interlayed with minor shallow-water calcarenites. The Poggio Vina volcanics were submerged during a second sea-level rise amounting to up to 100 m. The sea was generally shallow, i.e., (100 m deep, throughout most of the Late Pliocene and early Pleistocene. The Poggio Vina volcanism took place prior to the Emilian transgression. The sea-level rise might represent a continuation of the subsidence trend that caused the Lower Pliocene Trubi marine basin. Subaerial conditions were reached twice in the approximate time interval 1.9-1.6 Ma during phases of voluminous volcanism that outpaced subsidence. Uplift of approximately 600 m (Palagonia) to 950 m (Monte Lauro) occurred subsequent to emplacement of the Pleistocene alkalic volcanics. Bioclastic carbonates deposited concurrently with uplift drape a major fault scarp east of Palagonia with uplift rates in excess of 0.5 mm/a, provided most uplift occurred during ca. 1 Ma. Basinning continued beneath the half graben of the present Piana di Catania where volcanics several hundreds of meters thick -at least some of them alkalic in composition -occur at a depth of approximately 500-1500 m below the present surface. Quaternary uplift of the northwestern Iblean plateau may have been due to a major phase of underplating or rise of partially melted mantle. Composition of the volcanic rocks, total volume, and mass eruptive rates are well-correlated. The volumetrically very minor highly mafic Messinian nephelinites may have formed in response to Messinian lithosphere unloading following draining of the Mediterranean resulting in very low-degree partial melting. The nephelinitic to basanitic Pogg...

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Section: Volcanism In the Iblean Mountains: A Review Of Previous Studiesmentioning

confidence: 96%

Evolution of the northwestern Iblean Mountains, Sicily: uplift, Plicocene/Pleistocene sea-level changes, paleoenvironment, and volcanism

Schmincke¹,

Behncke²,

Grasso³

et al. 1997

Geologische Rundschau

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“…If basalts with the composition of the studied samples actually occur within oceanic areas both in spreading zones and in within plate islands, they occur as well in some continental zones, in areas probably affected by crustal thinning (as for instance in Mounts Iblei, Eastern Sicily, BATTAGLIA et al, 1976;CARTER ~g CIVETTA, in press). …”

Section: Structural Implicationsmentioning

confidence: 98%

Upper miocene submarine basalts from the western margin of the Red Sea (Secca Fawn-l hole, massawa channel)

Barberi

Cioni²,

Santachoce

1978

Geol Rundsch

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ZusammenfassnngDie Secca-Fawn-l-Bohrung, die 1968 von der Gulf Oil Company am westlichen Rand des siidlichen Roten Meeres abgeteuft wurde, erreichte in 1400 m Tiefe eine Folge von jungmioziinen bis altplioz~inen submarinen Basaltlagen, die mindestens 600 m m~ichtig sind. Es wurden homogene Basaltfragmente aus den Cuttings auf ihren Hauptelementgehalt hin analysiert; zahlreiche Spurenelemente wurden in einer Reihe dieser Proben bestimmt. Alle Basalte haben die Zusammensetzung yon tdbergangs-Olivin-Tholeiiten. Die prim~ire vertikale Ver~inderung zeigt eine zunehmende Tendenz zu mehr alkalischer Zusammensetzung, was auf eine chemische Ver~inderung dutch SeewassereinfluB in diesen Gesteinen zurfickgeffihrt werden kann. Die Secca-Fawn-l-Basalte erscheinen geochemisch zwischen typisehen ozeanischen Tholeiiten mit niedrigen K-Werten, wie sie im Roten Meer im zentralen Graben auftreten, und t3bergangs-Olivin-Tholeiiten entlang der spreading-Achse in der benachbarten Afar-Rift-Zone. Die K-Ar-Alter ergeben 5,8 und 8,2 m.y. Diese Alter sind jedoch mit Vorsicht zu betrachten, da die Proben einer sekund~iren Ver~inderung unterworfen waren. Als Folgerungen ffir die Strukturgeologic ergeben sich Zusammenh~inge ffir eine friihe spreading-Episode im Altplioz~in oder eine Dehnungstektonik in der kontinentalen Lithosph~ire des Rotmeerrandes. AbstractThe Seeca Fawn-1 hole, drilled in 1968 by Gulf Oil Co. on the western margin of Southern Red Sea, crossed at 1400 m depth a sequence of late Miocene-early Pliocene submarine basaltic flows, at least 600 m thick. This paper reports the results of the study of these basalts. Homogenous basaltic fragments were separated from 22 cuttings and analyzed for major elements; several trace elements were determined on 11 of these samples. All basalts have the composition of transitional olivine-tholeiites and a primary vertical variation, with a tendency towards a slightly more alkalic composition, was recognized in spite of the chemical changes induced by sea-water alteration which has affected rather deeply these rocks. Secca Fawn-1 basalts appear to be geochemically intermediate between typical low-K oceanic tholeiites as those erupted at Red Sea central trough and the transitional olivine-tholeiites of the spreading axes of the neighbouring Afar rift. K-Ar age results of 5.8 and 8.2 m. y. were obtained on two selected samples; these dates are however subject to caution because of the state of alteration of the samples. The structural implications of these data are discussed and it is thought that Secca Fawn-1 basalts are related either to a localized spreading episode averted in early Pliocene, or to extensional tectonics on the attenuated continental lithosphere of the Red Sea margin.

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“…The Rip Volcanics basalts (Sugisaki et al 1972) plot below the sub-alkaline line close to, or within, the Lottin Point basalts. The boundary lines, alkaline-sub-alkaline -tholeiitic, are from Battaglia et al, (1976). Soda versus potash variation diagram (Fig.…”

Section: Geochemistry Major Elementsmentioning

confidence: 99%

Geology, geochemistry, and mineralisation of a spilite-keratophyre association in Cretaceous flysch, East Cape area, New Zealand

Pirajno¹

1979

New Zealand Journal of Geology and Geophysics

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Rare earth element and other trace element distribution, and the origin of the iblean magmas

Cited by 10 publications

References 27 publications

Evolution of the northwestern Iblean Mountains, Sicily: uplift, Plicocene/Pleistocene sea-level changes, paleoenvironment, and volcanism

Evolution of the northwestern Iblean Mountains, Sicily: uplift, Plicocene/Pleistocene sea-level changes, paleoenvironment, and volcanism

Upper miocene submarine basalts from the western margin of the Red Sea (Secca Fawn-l hole, massawa channel)

Geology, geochemistry, and mineralisation of a spilite-keratophyre association in Cretaceous flysch, East Cape area, New Zealand

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