The oldest rocks of Greece: first evidence for a Precambrian terrane within the Pelagonian Zone
The Pelagonian Zone in Greece represents the westernmost belt of the Hellenide hinterland (Internal Hellenides). Previous geochronological studies of basement rocks from the Pelagonian Zone have systematically yielded Permo-Carboniferous ages. In this study we demonstrate, for the first time, the ex...
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| Veröffentlicht in: | Geological magazine 2006-01, Vol.143 (1), p.41-58 |
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| description | The Pelagonian Zone in Greece represents the westernmost belt of the Hellenide hinterland (Internal Hellenides). Previous geochronological studies of basement rocks from the Pelagonian Zone have systematically yielded Permo-Carboniferous ages. In this study we demonstrate, for the first time, the existence of a Precambrian crustal unit within the crystalline basement of the Pelagonian Zone. The U–Pb single-zircon and SHRIMP ages of these orthogneisses vary from 699 ± 7 Ma to 713 ± 18 Ma, which identify them as the oldest rocks in Greece. These Late Proterozoic rocks, which today occupy an area of c. 20 × 100 km, are significantly different from the neighbouring rocks of the Pelagonian Zone. They are therefore interpreted as delineating a terrane, named here the Florina Terrane. During the Permo-Carboniferous, Florina was incorporated into an active continental margin, where it formed part of the basement for the Pelagonian magmatic arc. The activity of this arc was dated in this study by single-zircon Pb/Pb ages as having taken place at 292 ± 5 Ma and 298 ± 7 Ma. During the Alpine orogeny, Florina, together with the Pelagonian Zone, eventually became a constituent of the Hellenides. Geochemically, the Florina orthogneisses represent granites formed at an active continental margin. Because of the Late Proterozoic ages, this Late Proterozoic active continental margin can be correlated to a Pan-African or Cadomian arc. As the gneisses contain inherited zircons of Late to Middle Proterozoic age, the original location of Florina was probably at the northwestern margin of Gondwana. Similar to other Gondwana-derived terranes, such as East Avalonia, Florina approached the southern margin of Eurasia during Palaeozoic times, where it became part of an active continental margin above the subducting Palaeotethys. These interpretations further indicate that terrane accretion was already playing an important role in the early pre-alpine evolution of the Hellenides. |
| doi_str_mv | 10.1017/S0016756805001111 |
| format | Article |
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Previous geochronological studies of basement rocks from the Pelagonian Zone have systematically yielded Permo-Carboniferous ages. In this study we demonstrate, for the first time, the existence of a Precambrian crustal unit within the crystalline basement of the Pelagonian Zone. The U–Pb single-zircon and SHRIMP ages of these orthogneisses vary from 699 ± 7 Ma to 713 ± 18 Ma, which identify them as the oldest rocks in Greece. These Late Proterozoic rocks, which today occupy an area of c. 20 × 100 km, are significantly different from the neighbouring rocks of the Pelagonian Zone. They are therefore interpreted as delineating a terrane, named here the Florina Terrane. During the Permo-Carboniferous, Florina was incorporated into an active continental margin, where it formed part of the basement for the Pelagonian magmatic arc. The activity of this arc was dated in this study by single-zircon Pb/Pb ages as having taken place at 292 ± 5 Ma and 298 ± 7 Ma. During the Alpine orogeny, Florina, together with the Pelagonian Zone, eventually became a constituent of the Hellenides. Geochemically, the Florina orthogneisses represent granites formed at an active continental margin. Because of the Late Proterozoic ages, this Late Proterozoic active continental margin can be correlated to a Pan-African or Cadomian arc. As the gneisses contain inherited zircons of Late to Middle Proterozoic age, the original location of Florina was probably at the northwestern margin of Gondwana. Similar to other Gondwana-derived terranes, such as East Avalonia, Florina approached the southern margin of Eurasia during Palaeozoic times, where it became part of an active continental margin above the subducting Palaeotethys. These interpretations further indicate that terrane accretion was already playing an important role in the early pre-alpine evolution of the Hellenides.</description><identifier>ISSN: 0016-7568</identifier><identifier>EISSN: 1469-5081</identifier><identifier>DOI: 10.1017/S0016756805001111</identifier><identifier>CODEN: GEMGA4</identifier><language>eng</language><publisher>Cambridge, UK: Cambridge University Press</publisher><subject>absolute age ; Accretion ; active margins ; alkaline earth metals ; Asia ; basement ; Carboniferous ; continental crust ; continental margin ; Continental margins ; crust ; dates ; Deskati Orthogneiss ; Europe ; Florina Orthogneiss ; Florina Terrane ; Fotino Granite ; geochemistry ; Geochronology ; Geological time ; Geology ; Gondwana ; granites ; Greece ; Hellenides ; ICP mass spectra ; igneous rocks ; ion probe data ; island arcs ; isotope ratios ; isotopes ; Kastoria Granite ; lead ; lithostratigraphy ; mass spectra ; Menderes Massif ; metals ; Middle East ; Nd isotopes ; Nd-144/Nd-143 ; neodymium ; Neoproterozoic ; Neoproterozoic basement ; nesosilicates ; ophiolite ; Original Article ; Orogeny ; orthosilicates ; paleoenvironment ; paleogeography ; Paleozoic ; Pb-207/Pb-206 ; Pelagonian Zone ; Permian ; Pindus Mountains ; plate tectonics ; plutonic rocks ; Precambrian ; Proterozoic ; rare earths ; Rocks ; SHRIMP data ; silicates ; Southern Europe ; spectra ; Sr-87/Sr-86 ; stable isotopes ; strontium ; subduction ; terranes ; Tethys ; Turkey ; U/Pb ; upper Precambrian ; Varnous Granodiorite ; X-ray fluorescence spectra ; zircon ; zircon geochronology ; zircon group</subject><ispartof>Geological magazine, 2006-01, Vol.143 (1), p.41-58</ispartof><rights>2006 Cambridge University Press</rights><rights>GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld @Alexandria, VA @USA @United States. Abstract, Copyright, Cambridge University Press</rights><rights>Copyright Cambridge University Press, Publishing Division Jan 2006</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a413t-2cef6f0e5f333e9ae529df73f4e0ec4684b9589eae31a46400447fffdd72d8073</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.cambridge.org/core/product/identifier/S0016756805001111/type/journal_article$$EHTML$$P50$$Gcambridge$$H</linktohtml><link.rule.ids>164,314,780,784,27924,27925,55628</link.rule.ids></links><search><creatorcontrib>ANDERS, B.</creatorcontrib><creatorcontrib>REISCHMANN, T.</creatorcontrib><creatorcontrib>KOSTOPOULOS, D.</creatorcontrib><creatorcontrib>POLLER, U.</creatorcontrib><title>The oldest rocks of Greece: first evidence for a Precambrian terrane within the Pelagonian Zone</title><title>Geological magazine</title><addtitle>Geol. Mag</addtitle><description>The Pelagonian Zone in Greece represents the westernmost belt of the Hellenide hinterland (Internal Hellenides). Previous geochronological studies of basement rocks from the Pelagonian Zone have systematically yielded Permo-Carboniferous ages. In this study we demonstrate, for the first time, the existence of a Precambrian crustal unit within the crystalline basement of the Pelagonian Zone. The U–Pb single-zircon and SHRIMP ages of these orthogneisses vary from 699 ± 7 Ma to 713 ± 18 Ma, which identify them as the oldest rocks in Greece. These Late Proterozoic rocks, which today occupy an area of c. 20 × 100 km, are significantly different from the neighbouring rocks of the Pelagonian Zone. They are therefore interpreted as delineating a terrane, named here the Florina Terrane. During the Permo-Carboniferous, Florina was incorporated into an active continental margin, where it formed part of the basement for the Pelagonian magmatic arc. The activity of this arc was dated in this study by single-zircon Pb/Pb ages as having taken place at 292 ± 5 Ma and 298 ± 7 Ma. During the Alpine orogeny, Florina, together with the Pelagonian Zone, eventually became a constituent of the Hellenides. Geochemically, the Florina orthogneisses represent granites formed at an active continental margin. Because of the Late Proterozoic ages, this Late Proterozoic active continental margin can be correlated to a Pan-African or Cadomian arc. As the gneisses contain inherited zircons of Late to Middle Proterozoic age, the original location of Florina was probably at the northwestern margin of Gondwana. Similar to other Gondwana-derived terranes, such as East Avalonia, Florina approached the southern margin of Eurasia during Palaeozoic times, where it became part of an active continental margin above the subducting Palaeotethys. These interpretations further indicate that terrane accretion was already playing an important role in the early pre-alpine evolution of the Hellenides.</description><subject>absolute age</subject><subject>Accretion</subject><subject>active margins</subject><subject>alkaline earth metals</subject><subject>Asia</subject><subject>basement</subject><subject>Carboniferous</subject><subject>continental crust</subject><subject>continental margin</subject><subject>Continental margins</subject><subject>crust</subject><subject>dates</subject><subject>Deskati Orthogneiss</subject><subject>Europe</subject><subject>Florina Orthogneiss</subject><subject>Florina Terrane</subject><subject>Fotino Granite</subject><subject>geochemistry</subject><subject>Geochronology</subject><subject>Geological time</subject><subject>Geology</subject><subject>Gondwana</subject><subject>granites</subject><subject>Greece</subject><subject>Hellenides</subject><subject>ICP mass spectra</subject><subject>igneous rocks</subject><subject>ion probe data</subject><subject>island arcs</subject><subject>isotope ratios</subject><subject>isotopes</subject><subject>Kastoria Granite</subject><subject>lead</subject><subject>lithostratigraphy</subject><subject>mass spectra</subject><subject>Menderes Massif</subject><subject>metals</subject><subject>Middle East</subject><subject>Nd isotopes</subject><subject>Nd-144/Nd-143</subject><subject>neodymium</subject><subject>Neoproterozoic</subject><subject>Neoproterozoic basement</subject><subject>nesosilicates</subject><subject>ophiolite</subject><subject>Original Article</subject><subject>Orogeny</subject><subject>orthosilicates</subject><subject>paleoenvironment</subject><subject>paleogeography</subject><subject>Paleozoic</subject><subject>Pb-207/Pb-206</subject><subject>Pelagonian Zone</subject><subject>Permian</subject><subject>Pindus Mountains</subject><subject>plate tectonics</subject><subject>plutonic rocks</subject><subject>Precambrian</subject><subject>Proterozoic</subject><subject>rare earths</subject><subject>Rocks</subject><subject>SHRIMP data</subject><subject>silicates</subject><subject>Southern Europe</subject><subject>spectra</subject><subject>Sr-87/Sr-86</subject><subject>stable isotopes</subject><subject>strontium</subject><subject>subduction</subject><subject>terranes</subject><subject>Tethys</subject><subject>Turkey</subject><subject>U/Pb</subject><subject>upper Precambrian</subject><subject>Varnous Granodiorite</subject><subject>X-ray fluorescence spectra</subject><subject>zircon</subject><subject>zircon geochronology</subject><subject>zircon group</subject><issn>0016-7568</issn><issn>1469-5081</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNp1UMtOwzAQtBBIlMIHcLO4osA6fiThhiooICSKWoTExTLJuoS2cbHD6-9xKAIkhC_27szsjoeQXQYHDFh2OAZgKpMqBxlf8ayRHhOqSCTkbJ30Ojjp8E2yFcJjLDnkeY_oyQNSN68wtNS7chaos3ToEUs8orb2sY0vdYVNidQ6Tw0deSzN4t7XpqEtem8apK91-1DHMs4a4dxMXdOhd67BbbJhzTzgztfdJzenJ5PBWXJ5NTwfHF8mRjDeJmmJVllAaTnnWBiUaVHZjFuBgKVQubgvZF6gQc6MUAJAiMxaW1VZWuWQ8T7ZW81devf0HH-jH92zb-JKzQolWCrTPJLYilR6F4JHq5e-Xhj_rhnoLkb9J8aoSVaaOrT49i0wfqZVxjOp1fBaX4zZ6HYCTF9E_v6KP0UXyroL7tX5efXjJwVQGgQXqYxs_uXoM9Jqir98_-vpA-YSkeQ</recordid><startdate>200601</startdate><enddate>200601</enddate><creator>ANDERS, B.</creator><creator>REISCHMANN, T.</creator><creator>KOSTOPOULOS, D.</creator><creator>POLLER, U.</creator><general>Cambridge University Press</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7UA</scope><scope>7XB</scope><scope>88I</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>8G5</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>H96</scope><scope>HCIFZ</scope><scope>L.G</scope><scope>L6V</scope><scope>M2O</scope><scope>M2P</scope><scope>M7S</scope><scope>MBDVC</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>Q9U</scope><scope>R05</scope></search><sort><creationdate>200601</creationdate><title>The oldest rocks of Greece: first evidence for a Precambrian terrane within the Pelagonian Zone</title><author>ANDERS, B. ; REISCHMANN, T. ; KOSTOPOULOS, D. ; POLLER, U.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a413t-2cef6f0e5f333e9ae529df73f4e0ec4684b9589eae31a46400447fffdd72d8073</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2006</creationdate><topic>absolute age</topic><topic>Accretion</topic><topic>active margins</topic><topic>alkaline earth metals</topic><topic>Asia</topic><topic>basement</topic><topic>Carboniferous</topic><topic>continental crust</topic><topic>continental margin</topic><topic>Continental margins</topic><topic>crust</topic><topic>dates</topic><topic>Deskati Orthogneiss</topic><topic>Europe</topic><topic>Florina Orthogneiss</topic><topic>Florina Terrane</topic><topic>Fotino Granite</topic><topic>geochemistry</topic><topic>Geochronology</topic><topic>Geological time</topic><topic>Geology</topic><topic>Gondwana</topic><topic>granites</topic><topic>Greece</topic><topic>Hellenides</topic><topic>ICP mass spectra</topic><topic>igneous rocks</topic><topic>ion probe data</topic><topic>island arcs</topic><topic>isotope ratios</topic><topic>isotopes</topic><topic>Kastoria Granite</topic><topic>lead</topic><topic>lithostratigraphy</topic><topic>mass spectra</topic><topic>Menderes Massif</topic><topic>metals</topic><topic>Middle East</topic><topic>Nd isotopes</topic><topic>Nd-144/Nd-143</topic><topic>neodymium</topic><topic>Neoproterozoic</topic><topic>Neoproterozoic basement</topic><topic>nesosilicates</topic><topic>ophiolite</topic><topic>Original Article</topic><topic>Orogeny</topic><topic>orthosilicates</topic><topic>paleoenvironment</topic><topic>paleogeography</topic><topic>Paleozoic</topic><topic>Pb-207/Pb-206</topic><topic>Pelagonian Zone</topic><topic>Permian</topic><topic>Pindus Mountains</topic><topic>plate tectonics</topic><topic>plutonic rocks</topic><topic>Precambrian</topic><topic>Proterozoic</topic><topic>rare earths</topic><topic>Rocks</topic><topic>SHRIMP data</topic><topic>silicates</topic><topic>Southern Europe</topic><topic>spectra</topic><topic>Sr-87/Sr-86</topic><topic>stable isotopes</topic><topic>strontium</topic><topic>subduction</topic><topic>terranes</topic><topic>Tethys</topic><topic>Turkey</topic><topic>U/Pb</topic><topic>upper Precambrian</topic><topic>Varnous Granodiorite</topic><topic>X-ray fluorescence spectra</topic><topic>zircon</topic><topic>zircon geochronology</topic><topic>zircon group</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>ANDERS, B.</creatorcontrib><creatorcontrib>REISCHMANN, T.</creatorcontrib><creatorcontrib>KOSTOPOULOS, D.</creatorcontrib><creatorcontrib>POLLER, U.</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Water Resources 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Basic</collection><collection>University of Michigan</collection><jtitle>Geological magazine</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>ANDERS, B.</au><au>REISCHMANN, T.</au><au>KOSTOPOULOS, D.</au><au>POLLER, U.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The oldest rocks of Greece: first evidence for a Precambrian terrane within the Pelagonian Zone</atitle><jtitle>Geological magazine</jtitle><addtitle>Geol. Mag</addtitle><date>2006-01</date><risdate>2006</risdate><volume>143</volume><issue>1</issue><spage>41</spage><epage>58</epage><pages>41-58</pages><issn>0016-7568</issn><eissn>1469-5081</eissn><coden>GEMGA4</coden><abstract>The Pelagonian Zone in Greece represents the westernmost belt of the Hellenide hinterland (Internal Hellenides). Previous geochronological studies of basement rocks from the Pelagonian Zone have systematically yielded Permo-Carboniferous ages. In this study we demonstrate, for the first time, the existence of a Precambrian crustal unit within the crystalline basement of the Pelagonian Zone. The U–Pb single-zircon and SHRIMP ages of these orthogneisses vary from 699 ± 7 Ma to 713 ± 18 Ma, which identify them as the oldest rocks in Greece. These Late Proterozoic rocks, which today occupy an area of c. 20 × 100 km, are significantly different from the neighbouring rocks of the Pelagonian Zone. They are therefore interpreted as delineating a terrane, named here the Florina Terrane. During the Permo-Carboniferous, Florina was incorporated into an active continental margin, where it formed part of the basement for the Pelagonian magmatic arc. The activity of this arc was dated in this study by single-zircon Pb/Pb ages as having taken place at 292 ± 5 Ma and 298 ± 7 Ma. During the Alpine orogeny, Florina, together with the Pelagonian Zone, eventually became a constituent of the Hellenides. Geochemically, the Florina orthogneisses represent granites formed at an active continental margin. Because of the Late Proterozoic ages, this Late Proterozoic active continental margin can be correlated to a Pan-African or Cadomian arc. As the gneisses contain inherited zircons of Late to Middle Proterozoic age, the original location of Florina was probably at the northwestern margin of Gondwana. Similar to other Gondwana-derived terranes, such as East Avalonia, Florina approached the southern margin of Eurasia during Palaeozoic times, where it became part of an active continental margin above the subducting Palaeotethys. These interpretations further indicate that terrane accretion was already playing an important role in the early pre-alpine evolution of the Hellenides.</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><doi>10.1017/S0016756805001111</doi><tpages>18</tpages></addata></record> |
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| ispartof | Geological magazine, 2006-01, Vol.143 (1), p.41-58 |
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| source | Cambridge University Press Journals Complete |
| subjects | absolute age Accretion active margins alkaline earth metals Asia basement Carboniferous continental crust continental margin Continental margins crust dates Deskati Orthogneiss Europe Florina Orthogneiss Florina Terrane Fotino Granite geochemistry Geochronology Geological time Geology Gondwana granites Greece Hellenides ICP mass spectra igneous rocks ion probe data island arcs isotope ratios isotopes Kastoria Granite lead lithostratigraphy mass spectra Menderes Massif metals Middle East Nd isotopes Nd-144/Nd-143 neodymium Neoproterozoic Neoproterozoic basement nesosilicates ophiolite Original Article Orogeny orthosilicates paleoenvironment paleogeography Paleozoic Pb-207/Pb-206 Pelagonian Zone Permian Pindus Mountains plate tectonics plutonic rocks Precambrian Proterozoic rare earths Rocks SHRIMP data silicates Southern Europe spectra Sr-87/Sr-86 stable isotopes strontium subduction terranes Tethys Turkey U/Pb upper Precambrian Varnous Granodiorite X-ray fluorescence spectra zircon zircon geochronology zircon group |
| title | The oldest rocks of Greece: first evidence for a Precambrian terrane within the Pelagonian Zone |
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