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Soriano, C.
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- PublicationRestrictedFacies architecture, emplacement mechanisms and eruption style of the submarine andesite El Barronal complex, Cabo de Gata, SE Spain(2013-10-10)
; ; ; ; ; ;Soriano, C.; Institut de Ciències de la Terra Jaume Almera, CSIC ;Giordano, G.; Dipartimento di Scienze Geologiche, Università degli Studi Roma Tre ;Cas, R.; School of Geosciences, Rm 128 Building 28 Clayton Campus,Monash University ;Riggs, N.; School of Earth Sciences and Environmental Sustainability, Northern Arizona University ;Porreca, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ;; El Barronal complex consists of a succession of andesite lavas and andesite volcaniclastic facies interbeddedwith carbonate and siliciclastic sedimentary rocks. Carbonate and siliciclastic rocks were deposited in a shallow- marine environment during periods of volcanic quiescence. Lavas consist of an inner coherent core grading out- ward into hyaloclastite brecciamade of dense clasts that in turn grade into hyaloclastite brecciamade of vesicular clasts, in massive to layered zones. Volcaniclastic facies contain clasts produced during explosive eruptions and reworked clasts from sources above wave base. Volcaniclastic facies were deposited from cold granular flows with different grain size populations. Stratigraphy and facies architecture at El Barronal suggest that a succession of several discrete eruptive events occurred with a similar cyclic pattern made of an initial explosive phase followed by effusive emplacement of lavas, in turn followed by a period of quiescence of volcanic activity. Hyaloclastic fragmentation of magma took place in the final stages of lava emplacement, allowing only for local disorganization of the jigsaw-fit texture.226 50 - PublicationRestrictedHyaloclastite fragmentation below the glass transition: An example from El Barronal submarine volcanic complex (Spain)(2014-02-10)
; ; ; ; ; ; ; ;Porreca, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Cifelli, F.; Dipartimento di Scienze, Università degli Studi Roma Tre ;Soriano, C.; Institut de Ciències de la Terra Jaume Almera (CSIC) ;Giordano, G.; Dipartimento di Scienze, Università degli Studi Roma Tre ;Romano, C.; Dipartimento di Scienze, Università degli Studi Roma Tre ;Conticelli, S.; Dipartimento di Scienze della Terra, Università di Firenze ;Massimo, M.; Dipartimento di Scienze, Università degli Studi Roma Tre; ; ; ; ; ; Submarine felsic volcanoes are dominated by hyaloclastic piles hundreds of meters thick, the origin of which, in terms of how and when they form, is far from being completely understood. Here we present a study of the thermal remanent magnetization of the Miocene high-K dacitic El Barronal hyaloclastites (Cabo de Gata, Spain), showing that their formation is dominated by in situ fragmentation with small or negligible transportation and/or rotation of different clasts after their formation. Data indicate that fragmentation progressed down to 210–390 °C, well below the glass-transition temperature estimated at 560–750 ºC depending on the water content of the high-K dacite. Hence, hyaloclastite fragmentation in thick lavas may occur over most of the cooling history, as a result of the progressive access of sea water toward the lava interior by development of a complex network of contraction fractures.302 50