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The trace-element characteristics of Aegean and Aeolian volcanic arc marine tephra

Identifieur interne : 000239 ( Main/Exploration ); précédent : 000238; suivant : 000240

The trace-element characteristics of Aegean and Aeolian volcanic arc marine tephra

Auteurs : Peter Clift [États-Unis] ; Jerzy Blusztajn [États-Unis]

Source :

RBID : ISTEX:5A1934286FF829F88BB11249676DCD7BCDEFE291

Descripteurs français

English descriptors

Abstract

Abstract: High-silica volcanic ashes are found within deep-sea sediments throughout the Eastern Mediterranean. Although coring by Ocean Drilling Program has penetrated Lower Pliocene (∼4 Ma) sediments, few ashes older than 400 k.y. have been recovered, suggesting a young initiation to subaerial Aegean Arc volcanism. Ashes derived from the Aegean volcanic front were cored south and east of the arc, and are typified by medium-K, calc-alkaline major-element compositions, contrasting with high-K ashes from the Aeolian Arc found in the Ionian Sea and as far east as Crete. Ion microprobe analysis of individual glass shards shows that all the ashes have a light rare earth element (LREE)-enriched pattern after normalizing against a chondrite standard. Aeolian Arc-derived ashes show greater enrichment than those from the Aegean area. Within the latter set, two groups are discernible, a mildly enriched set similar to the volcanoes of the arc volcanic front, and a more enriched group corresponding to lavas from the backarc region or possible from western Anatolia. Multi-element `spider diagrams' also show a bimodal division of enriched and depleted Aegean ashes, possibly caused by source depletion due to melt extraction in the Aegean backarc followed by remelting under the volcanic front. Relative Nb depletion, a characteristic of arc volcanism, is seen to be modest in Aegean and non-existent in Aeolian ashes. Using B/Be as a proxy for the flux of material from the subducting slab, this influence is seen to be low in the Aeolian Arc but higher than at Vesuvius. B/Be is higher again in the Aegean Arc. These differences may reflect the rate of subduction in each system. Data suggest caution is required when correlating ashes solely on the basis of major elements, as alkaline ashes from the central part of the study may be derived from Italy or from the Aegean backarc.

Url:
DOI: 10.1016/S0377-0273(99)00059-1


Affiliations:


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<term>Aegean</term>
<term>Aegean area</term>
<term>Aegean ashes</term>
<term>Aegean backarc</term>
<term>Aegean region</term>
<term>Aegean system</term>
<term>Aeolian</term>
<term>Aeolian arcs</term>
<term>Aeolian islands</term>
<term>Alkalic</term>
<term>Alkaline ashes</term>
<term>Analytical uncertainties</term>
<term>Anatolia</term>
<term>Ash</term>
<term>Ashes show</term>
<term>Backarc</term>
<term>Backarc extension</term>
<term>Backarc region</term>
<term>Basalt</term>
<term>Blusztajnr</term>
<term>Blusztajnr journal</term>
<term>Brbe</term>
<term>Brbe values</term>
<term>Campanian</term>
<term>Campanian ashes</term>
<term>Campanian province</term>
<term>Central aegean</term>
<term>Central anatolia</term>
<term>Central ashes</term>
<term>Central site</term>
<term>Central sites</term>
<term>Chemical contribution</term>
<term>Chemical depletion</term>
<term>Chondrite composition</term>
<term>Classification fields</term>
<term>Clift</term>
<term>College station</term>
<term>Continental crust</term>
<term>Convergence</term>
<term>Coring sites</term>
<term>Crete</term>
<term>Crust</term>
<term>Diagenetic alteration</term>
<term>Different parts</term>
<term>Different record</term>
<term>Distinct trends</term>
<term>Early miocene</term>
<term>Early stages</term>
<term>Earth planet</term>
<term>Eastern anatolia</term>
<term>Eastern ashes</term>
<term>Eastern mediterranean</term>
<term>Eastern sites</term>
<term>Electron microprobe analysis</term>
<term>Elemental ratios</term>
<term>Ellam</term>
<term>Elsevier science</term>
<term>Enrichment</term>
<term>Eruption</term>
<term>Fractional crystallization</term>
<term>Geol</term>
<term>Geotherm</term>
<term>Geothermal</term>
<term>Geothermal research</term>
<term>Glass shards</term>
<term>Golcuk area</term>
<term>Hawkesworth</term>
<term>Herodotus abyssal</term>
<term>High field strength elements</term>
<term>High silica content</term>
<term>Huijsmans</term>
<term>Innocenti</term>
<term>Ionian basin</term>
<term>Isotope</term>
<term>Isotope systematics</term>
<term>Keller</term>
<term>Laryb</term>
<term>Late cenozoic</term>
<term>Late miocene</term>
<term>Lava</term>
<term>Lree</term>
<term>Lree enrichment</term>
<term>Lrees</term>
<term>Magma</term>
<term>Magma chamber</term>
<term>Magma genesis</term>
<term>Major element chemistry</term>
<term>Major elements</term>
<term>Major eruption</term>
<term>Major eruptions</term>
<term>Mantle phases</term>
<term>Mantle wedge</term>
<term>Marine record</term>
<term>Marine tephra</term>
<term>Mediterranean</term>
<term>Mediterranean arcs</term>
<term>Mediterranean ashes</term>
<term>Mediterranean ridge</term>
<term>Messinian evaporites</term>
<term>Microprobe</term>
<term>Microprobe analysis</term>
<term>Middle miocene</term>
<term>Minoan tephra</term>
<term>Miocene</term>
<term>Nbrzr</term>
<term>Nile delta</term>
<term>Ninkovich</term>
<term>Ocean drilling program</term>
<term>Oceanic crust</term>
<term>Orogenic belts</term>
<term>Other element groups</term>
<term>Patmos</term>
<term>Pearce</term>
<term>Petrogenesis</term>
<term>Piston cores</term>
<term>Pliocene volcanism</term>
<term>Potential sources</term>
<term>Probe analysis</term>
<term>Quaternary</term>
<term>Rare earth elements</term>
<term>Relative depletion</term>
<term>Relative enrichment</term>
<term>Relative lree enrichment</term>
<term>Santorini</term>
<term>Sediment</term>
<term>Sediment subduction</term>
<term>Shard</term>
<term>Silica</term>
<term>Silica content</term>
<term>Silica contents</term>
<term>Slab flux</term>
<term>Small number</term>
<term>Source volcanoes</term>
<term>Spider diagrams</term>
<term>Study region</term>
<term>Subducting</term>
<term>Subducting plate</term>
<term>Subducting slab</term>
<term>Subduction</term>
<term>Subduction zone</term>
<term>Tectonic disturbance</term>
<term>Temporal evolution</term>
<term>Temporal variation</term>
<term>Tephra</term>
<term>Tephra layers</term>
<term>Tephra studies</term>
<term>Thermal state</term>
<term>Trace elements</term>
<term>Unpublished data</term>
<term>Upper mantle</term>
<term>Vesuvius</term>
<term>Volcanic</term>
<term>Volcanic ashes</term>
<term>Volcanic centers</term>
<term>Volcanic front</term>
<term>Volcanic glass</term>
<term>Volcanic glass shards</term>
<term>Volcanic rocks</term>
<term>Volcanism</term>
<term>Volcano</term>
<term>Volcanol</term>
<term>Volcanology</term>
<term>Water column</term>
<term>Western ashes</term>
<term>Western site</term>
<term>Western taurides</term>
<term>Western turkey</term>
<term>Woods hole</term>
<term>Wyers</term>
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<term>Aegean</term>
<term>Aegean area</term>
<term>Aegean ashes</term>
<term>Aegean backarc</term>
<term>Aegean region</term>
<term>Aegean system</term>
<term>Aeolian</term>
<term>Aeolian arcs</term>
<term>Aeolian islands</term>
<term>Alkalic</term>
<term>Alkaline ashes</term>
<term>Analytical uncertainties</term>
<term>Anatolia</term>
<term>Ash</term>
<term>Ashes show</term>
<term>Backarc</term>
<term>Backarc extension</term>
<term>Backarc region</term>
<term>Basalt</term>
<term>Blusztajnr</term>
<term>Blusztajnr journal</term>
<term>Brbe</term>
<term>Brbe values</term>
<term>Campanian</term>
<term>Campanian ashes</term>
<term>Campanian province</term>
<term>Central aegean</term>
<term>Central anatolia</term>
<term>Central ashes</term>
<term>Central site</term>
<term>Central sites</term>
<term>Chemical contribution</term>
<term>Chemical depletion</term>
<term>Chondrite composition</term>
<term>Classification fields</term>
<term>Clift</term>
<term>College station</term>
<term>Continental crust</term>
<term>Convergence</term>
<term>Coring sites</term>
<term>Crete</term>
<term>Crust</term>
<term>Diagenetic alteration</term>
<term>Different parts</term>
<term>Different record</term>
<term>Distinct trends</term>
<term>Early miocene</term>
<term>Early stages</term>
<term>Earth planet</term>
<term>Eastern anatolia</term>
<term>Eastern ashes</term>
<term>Eastern mediterranean</term>
<term>Eastern sites</term>
<term>Electron microprobe analysis</term>
<term>Elemental ratios</term>
<term>Ellam</term>
<term>Elsevier science</term>
<term>Enrichment</term>
<term>Eruption</term>
<term>Fractional crystallization</term>
<term>Geol</term>
<term>Geotherm</term>
<term>Geothermal</term>
<term>Geothermal research</term>
<term>Glass shards</term>
<term>Golcuk area</term>
<term>Hawkesworth</term>
<term>Herodotus abyssal</term>
<term>High field strength elements</term>
<term>High silica content</term>
<term>Huijsmans</term>
<term>Innocenti</term>
<term>Ionian basin</term>
<term>Isotope</term>
<term>Isotope systematics</term>
<term>Keller</term>
<term>Laryb</term>
<term>Late cenozoic</term>
<term>Late miocene</term>
<term>Lava</term>
<term>Lree</term>
<term>Lree enrichment</term>
<term>Lrees</term>
<term>Magma</term>
<term>Magma chamber</term>
<term>Magma genesis</term>
<term>Major element chemistry</term>
<term>Major elements</term>
<term>Major eruption</term>
<term>Major eruptions</term>
<term>Mantle phases</term>
<term>Mantle wedge</term>
<term>Marine record</term>
<term>Marine tephra</term>
<term>Mediterranean</term>
<term>Mediterranean arcs</term>
<term>Mediterranean ashes</term>
<term>Mediterranean ridge</term>
<term>Messinian evaporites</term>
<term>Microprobe</term>
<term>Microprobe analysis</term>
<term>Middle miocene</term>
<term>Minoan tephra</term>
<term>Miocene</term>
<term>Nbrzr</term>
<term>Nile delta</term>
<term>Ninkovich</term>
<term>Ocean drilling program</term>
<term>Oceanic crust</term>
<term>Orogenic belts</term>
<term>Other element groups</term>
<term>Patmos</term>
<term>Pearce</term>
<term>Petrogenesis</term>
<term>Piston cores</term>
<term>Pliocene volcanism</term>
<term>Potential sources</term>
<term>Probe analysis</term>
<term>Quaternary</term>
<term>Rare earth elements</term>
<term>Relative depletion</term>
<term>Relative enrichment</term>
<term>Relative lree enrichment</term>
<term>Santorini</term>
<term>Sediment</term>
<term>Sediment subduction</term>
<term>Shard</term>
<term>Silica</term>
<term>Silica content</term>
<term>Silica contents</term>
<term>Slab flux</term>
<term>Small number</term>
<term>Source volcanoes</term>
<term>Spider diagrams</term>
<term>Study region</term>
<term>Subducting</term>
<term>Subducting plate</term>
<term>Subducting slab</term>
<term>Subduction</term>
<term>Subduction zone</term>
<term>Tectonic disturbance</term>
<term>Temporal evolution</term>
<term>Temporal variation</term>
<term>Tephra</term>
<term>Tephra layers</term>
<term>Tephra studies</term>
<term>Thermal state</term>
<term>Trace elements</term>
<term>Unpublished data</term>
<term>Upper mantle</term>
<term>Vesuvius</term>
<term>Volcanic</term>
<term>Volcanic ashes</term>
<term>Volcanic centers</term>
<term>Volcanic front</term>
<term>Volcanic glass</term>
<term>Volcanic glass shards</term>
<term>Volcanic rocks</term>
<term>Volcanism</term>
<term>Volcano</term>
<term>Volcanol</term>
<term>Volcanology</term>
<term>Water column</term>
<term>Western ashes</term>
<term>Western site</term>
<term>Western taurides</term>
<term>Western turkey</term>
<term>Woods hole</term>
<term>Wyers</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr">
<term>Crète</term>
<term>Volcanologie</term>
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<front>
<div type="abstract" xml:lang="en">Abstract: High-silica volcanic ashes are found within deep-sea sediments throughout the Eastern Mediterranean. Although coring by Ocean Drilling Program has penetrated Lower Pliocene (∼4 Ma) sediments, few ashes older than 400 k.y. have been recovered, suggesting a young initiation to subaerial Aegean Arc volcanism. Ashes derived from the Aegean volcanic front were cored south and east of the arc, and are typified by medium-K, calc-alkaline major-element compositions, contrasting with high-K ashes from the Aeolian Arc found in the Ionian Sea and as far east as Crete. Ion microprobe analysis of individual glass shards shows that all the ashes have a light rare earth element (LREE)-enriched pattern after normalizing against a chondrite standard. Aeolian Arc-derived ashes show greater enrichment than those from the Aegean area. Within the latter set, two groups are discernible, a mildly enriched set similar to the volcanoes of the arc volcanic front, and a more enriched group corresponding to lavas from the backarc region or possible from western Anatolia. Multi-element `spider diagrams' also show a bimodal division of enriched and depleted Aegean ashes, possibly caused by source depletion due to melt extraction in the Aegean backarc followed by remelting under the volcanic front. Relative Nb depletion, a characteristic of arc volcanism, is seen to be modest in Aegean and non-existent in Aeolian ashes. Using B/Be as a proxy for the flux of material from the subducting slab, this influence is seen to be low in the Aeolian Arc but higher than at Vesuvius. B/Be is higher again in the Aegean Arc. These differences may reflect the rate of subduction in each system. Data suggest caution is required when correlating ashes solely on the basis of major elements, as alkaline ashes from the central part of the study may be derived from Italy or from the Aegean backarc.</div>
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