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Miocene magnesian andesites and dacites, Evia, Greece: adakites associated with subducting slab detachment and extension

Identifieur interne : 000334 ( Istex/Corpus ); précédent : 000333; suivant : 000335

Miocene magnesian andesites and dacites, Evia, Greece: adakites associated with subducting slab detachment and extension

Auteurs : Georgia Pe-Piper ; David J. W. Piper

Source :

RBID : ISTEX:A0FE82A1D8D44140075738A292C0057A63F20130

English descriptors

Abstract

Abstract: Mid-Miocene volcanic rocks are rare in the Aegean region, although early Miocene and late Miocene-Quaternary volcanism is widespread. At Oxylithos (island of Evia), 14 Ma dacites form a dome or sub-volcanic complex. Phreatomagmatic eruptions formed nearby rhyolitic pyroclastic surge deposits. The calc-alkaline dacites contain bronzite, Mg-rich clinopyroxene, phlogopite and plagioclase phenocrysts. The magma results from mixing of a Mg-rich andesitic magma, similar to that in the nearby island of Skyros, with more felsic magmas represented by the rhyolitic pyroclastics. The dacites are geochemically similar to adakites, which are derived by partial melting of eclogitic subducted oceanic crust and have low Y and Yb and high SrY ratio. 87Sr86Sr≈0.7095 is found in both dacite and rhyolite. Lead isotopic composition from the high-Mg andesite from Skyros, with 207Pb204Pb= 15.70 and 208Pb204Pb= 38.90, forms a linear trend with Evia dacite and rhyolite with 207Pb204Pb= 15.71 and 208Pb204Pb= 39.05. The high temperatures required to produce such magma resulted from decompression due to extension of the Aegean basin at the same time as the initial intrusion of the detached subducted slab in the western Aegean that has been imaged by seismic tomography. The Oxylithos rocks extend the known occurrences of adakite series rocks: this series is not restricted to sites with subduction of young oceanic crust.

Url:
DOI: 10.1016/0024-4937(94)90004-3

Links to Exploration step

ISTEX:A0FE82A1D8D44140075738A292C0057A63F20130

Le document en format XML

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<div type="abstract" xml:lang="en">Abstract: Mid-Miocene volcanic rocks are rare in the Aegean region, although early Miocene and late Miocene-Quaternary volcanism is widespread. At Oxylithos (island of Evia), 14 Ma dacites form a dome or sub-volcanic complex. Phreatomagmatic eruptions formed nearby rhyolitic pyroclastic surge deposits. The calc-alkaline dacites contain bronzite, Mg-rich clinopyroxene, phlogopite and plagioclase phenocrysts. The magma results from mixing of a Mg-rich andesitic magma, similar to that in the nearby island of Skyros, with more felsic magmas represented by the rhyolitic pyroclastics. The dacites are geochemically similar to adakites, which are derived by partial melting of eclogitic subducted oceanic crust and have low Y and Yb and high SrY ratio. 87Sr86Sr≈0.7095 is found in both dacite and rhyolite. Lead isotopic composition from the high-Mg andesite from Skyros, with 207Pb204Pb= 15.70 and 208Pb204Pb= 38.90, forms a linear trend with Evia dacite and rhyolite with 207Pb204Pb= 15.71 and 208Pb204Pb= 39.05. The high temperatures required to produce such magma resulted from decompression due to extension of the Aegean basin at the same time as the initial intrusion of the detached subducted slab in the western Aegean that has been imaged by seismic tomography. The Oxylithos rocks extend the known occurrences of adakite series rocks: this series is not restricted to sites with subduction of young oceanic crust.</div>
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<ce:title>Miocene magnesian andesites and dacites, Evia, Greece: adakites associated with subducting slab detachment and extension</ce:title>
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<ce:given-name>Georgia</ce:given-name>
<ce:surname>Pe-Piper</ce:surname>
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<ce:given-name>David J.W.</ce:given-name>
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<ce:textfn>Department of Geology, Saint Mary's University, Halifax, N.S. B3H 3C3, Canada</ce:textfn>
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<ce:textfn>Atlantic Geoscience Centre, Geological Survey of Canada, Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, N.S. B2Y 4A2, Canada</ce:textfn>
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<ce:simple-para>Mid-Miocene volcanic rocks are rare in the Aegean region, although early Miocene and late Miocene-Quaternary volcanism is widespread. At Oxylithos (island of Evia), 14 Ma dacites form a dome or sub-volcanic complex. Phreatomagmatic eruptions formed nearby rhyolitic pyroclastic surge deposits. The calc-alkaline dacites contain bronzite, Mg-rich clinopyroxene, phlogopite and plagioclase phenocrysts. The magma results from mixing of a Mg-rich andesitic magma, similar to that in the nearby island of Skyros, with more felsic magmas represented by the rhyolitic pyroclastics. The dacites are geochemically similar to adakites, which are derived by partial melting of eclogitic subducted oceanic crust and have low Y and Yb and high
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≈0.7095</math>
is found in both dacite and rhyolite. Lead isotopic composition from the high-Mg andesite from Skyros, with
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= 38.90</math>
, forms a linear trend with Evia dacite and rhyolite with
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. The high temperatures required to produce such magma resulted from decompression due to extension of the Aegean basin at the same time as the initial intrusion of the detached subducted slab in the western Aegean that has been imaged by seismic tomography. The Oxylithos rocks extend the known occurrences of adakite series rocks: this series is not restricted to sites with subduction of young oceanic crust.</ce:simple-para>
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<abstract lang="en">Abstract: Mid-Miocene volcanic rocks are rare in the Aegean region, although early Miocene and late Miocene-Quaternary volcanism is widespread. At Oxylithos (island of Evia), 14 Ma dacites form a dome or sub-volcanic complex. Phreatomagmatic eruptions formed nearby rhyolitic pyroclastic surge deposits. The calc-alkaline dacites contain bronzite, Mg-rich clinopyroxene, phlogopite and plagioclase phenocrysts. The magma results from mixing of a Mg-rich andesitic magma, similar to that in the nearby island of Skyros, with more felsic magmas represented by the rhyolitic pyroclastics. The dacites are geochemically similar to adakites, which are derived by partial melting of eclogitic subducted oceanic crust and have low Y and Yb and high SrY ratio. 87Sr86Sr≈0.7095 is found in both dacite and rhyolite. Lead isotopic composition from the high-Mg andesite from Skyros, with 207Pb204Pb= 15.70 and 208Pb204Pb= 38.90, forms a linear trend with Evia dacite and rhyolite with 207Pb204Pb= 15.71 and 208Pb204Pb= 39.05. The high temperatures required to produce such magma resulted from decompression due to extension of the Aegean basin at the same time as the initial intrusion of the detached subducted slab in the western Aegean that has been imaged by seismic tomography. The Oxylithos rocks extend the known occurrences of adakite series rocks: this series is not restricted to sites with subduction of young oceanic crust.</abstract>
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