Lead isotopic compositions of Neogene volcanic rocks from the Aegean extensional area
Identifieur interne : 000357 ( Main/Exploration ); précédent : 000356; suivant : 000358Lead isotopic compositions of Neogene volcanic rocks from the Aegean extensional area
Auteurs : Georgia Pe-Piper [Canada]Source :
- Chemical Geology [ 0009-2541 ] ; 1994.
Descripteurs français
English descriptors
- KwdEn :
- Adakitic, Adakitic andesite, Aegean, Aegean island, Aegean samples, African plate, Andesite, Andesite evia, Atlantic treaty, Basalt, Bodrum, Cenozoic, Central aegean, Central italy, Centre, Chemical geology, Chios, Continental crust, Crust, Crustal, Crustal contamination, Crustal extension, Crustal material, Crustal source, Early miocene, Early proterozoic, Earth planet, Eastern mediterranean, Ethiopian highlands, Euboecos, Evia, Extensional, Galena, Geochemical, Geochemical data, Geochemistry, Geodynamic evolution, Geol, Hellenic subduction zone, Igneous activity, Igneous rocks, Isotope, Isotope determinations, Isotope geochemistry, Isotopic, Isotopic character, Isotopic composition, Isotopic compositions, Isotopic data, Isotopic evidence, Isotopic ratios, Isotopic studies, Java arcs, Lesbos, Lesser antilles, Lett, Linear trend, Magma, Mantle array, Mantle source, Middle miocene, Miocene, Miocene granitoids, Miocene stratovolcanoes, Narrow range, Nile river, Nile sediment, Northern aegean, Petrol, Piper, Present crust, Psathoura, Quaternary, Quaternary basalt, Quaternary sediment, Residence time, Rhyolite, Rock types, Roman province, Samos, Santorini, Sediment, Shoshonitic suite, Sio2 tio2, Small centres, Source mantle, Southern aegean, Subducted, Subducted crustal material, Subducted nile sediment, Subducted sediment, Subduction, Tectonic implications, Tertiary, Trace element constraints, Trace elements, Volcanic, Volcanic centres, Volcanic rocks, Volcanism, Voras mountains, Western anatolia.
- Teeft :
- Adakitic, Adakitic andesite, Aegean, Aegean island, Aegean samples, African plate, Andesite, Andesite evia, Atlantic treaty, Basalt, Bodrum, Cenozoic, Central aegean, Central italy, Centre, Chemical geology, Chios, Continental crust, Crust, Crustal, Crustal contamination, Crustal extension, Crustal material, Crustal source, Early miocene, Early proterozoic, Earth planet, Eastern mediterranean, Ethiopian highlands, Euboecos, Evia, Extensional, Galena, Geochemical, Geochemical data, Geochemistry, Geodynamic evolution, Geol, Hellenic subduction zone, Igneous activity, Igneous rocks, Isotope, Isotope determinations, Isotope geochemistry, Isotopic, Isotopic character, Isotopic composition, Isotopic compositions, Isotopic data, Isotopic evidence, Isotopic ratios, Isotopic studies, Java arcs, Lesbos, Lesser antilles, Lett, Linear trend, Magma, Mantle array, Mantle source, Middle miocene, Miocene, Miocene granitoids, Miocene stratovolcanoes, Narrow range, Nile river, Nile sediment, Northern aegean, Petrol, Piper, Present crust, Psathoura, Quaternary, Quaternary basalt, Quaternary sediment, Residence time, Rhyolite, Rock types, Roman province, Samos, Santorini, Sediment, Shoshonitic suite, Sio2 tio2, Small centres, Source mantle, Southern aegean, Subducted, Subducted crustal material, Subducted nile sediment, Subducted sediment, Subduction, Tectonic implications, Tertiary, Trace element constraints, Trace elements, Volcanic, Volcanic centres, Volcanic rocks, Volcanism, Voras mountains, Western anatolia.
Abstract
Abstract: Lead isotope composition has been determined for a diverse suite of Cenozoic igneous rocks in the central and north Aegean Sea. These include voluminous Miocene shoshonitic and calc-alkali volcanic rocks and correlative plutonic phases; middle Miocene adakitic (high Mg) andesite and associated rhyolite; and middle Miocene to Quaternary ne-normative basalt, trachyte and K-rich andesite. The trace-element contents of most of the studied rocks suggests that Pb-isotopic composition is not a result of upper-crustal contamination, but rather is a feature of the mantle source for K-rich rocks. This mantle source is represented by primitive mafic to intermediate volcanic rocks with 87Sr86Sr ≈ 0.7095, high 207Pb204Pb and 208Pb204Pb, >1000 ppm Sr and Ba, and >35 ppm Pb. The high 207Pb204Pb requires a metasomatic origin that lowered U/Pb and increased Th/Pb, followed by a second-stage residence time of >1 Ga. This K-rich magma was generated as a result of late Tertiary extension of the Aegean. In the South Aegean Arc, there is more evidence for crustal contamination, either from present crust or from subduction of Nile-derived sediment.
Url:
DOI: 10.1016/0009-2541(94)90168-6
Affiliations:
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granitoids</term><term>Miocene stratovolcanoes</term><term>Narrow range</term><term>Nile river</term><term>Nile sediment</term><term>Northern aegean</term><term>Petrol</term><term>Piper</term><term>Present crust</term><term>Psathoura</term><term>Quaternary</term><term>Quaternary basalt</term><term>Quaternary sediment</term><term>Residence time</term><term>Rhyolite</term><term>Rock types</term><term>Roman province</term><term>Samos</term><term>Santorini</term><term>Sediment</term><term>Shoshonitic suite</term><term>Sio2 tio2</term><term>Small centres</term><term>Source mantle</term><term>Southern aegean</term><term>Subducted</term><term>Subducted crustal material</term><term>Subducted nile sediment</term><term>Subducted sediment</term><term>Subduction</term><term>Tectonic implications</term><term>Tertiary</term><term>Trace element constraints</term><term>Trace elements</term><term>Volcanic</term><term>Volcanic centres</term><term>Volcanic rocks</term><term>Volcanism</term><term>Voras mountains</term><term>Western anatolia</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Géochimie</term><term>Essence</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: Lead isotope composition has been determined for a diverse suite of Cenozoic igneous rocks in the central and north Aegean Sea. These include voluminous Miocene shoshonitic and calc-alkali volcanic rocks and correlative plutonic phases; middle Miocene adakitic (high Mg) andesite and associated rhyolite; and middle Miocene to Quaternary ne-normative basalt, trachyte and K-rich andesite. The trace-element contents of most of the studied rocks suggests that Pb-isotopic composition is not a result of upper-crustal contamination, but rather is a feature of the mantle source for K-rich rocks. This mantle source is represented by primitive mafic to intermediate volcanic rocks with 87Sr86Sr ≈ 0.7095, high 207Pb204Pb and 208Pb204Pb, >1000 ppm Sr and Ba, and >35 ppm Pb. The high 207Pb204Pb requires a metasomatic origin that lowered U/Pb and increased Th/Pb, followed by a second-stage residence time of >1 Ga. This K-rich magma was generated as a result of late Tertiary extension of the Aegean. In the South Aegean Arc, there is more evidence for crustal contamination, either from present crust or from subduction of Nile-derived sediment.</div></front></TEI><affiliations><list><country><li>Canada</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Pe Piper, Georgia" sort="Pe Piper, Georgia" uniqKey="Pe Piper G" first="Georgia" last="Pe-Piper">Georgia Pe-Piper</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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