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Neotectonic evolution of northwestern-continental Greece

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Zusammenfassung

Spätmiozäne Sedimentationsprozesse sowie strukturelle Entwicklung ändern sich in NW kontinental-Griechenland in E-W Richtung.

An der Ionischen Küste wurden während der spätmiozänen Absenkung des Sedimentationsraumes mächtige Olisthostrome und intrafoliale Falten gebildet. An der Grenze des Plio/Pleistozäns wurden flache überschiebungen, Lösungsschieferung und NNW bis NNE streichende, geöffnete Falten entwickelt. Diese tektonische Strukturen sind das Ergebnis aktiver Plattenkonvergenz zwischen der apulischen lithosphären-Platte und der ägäischen Platte. Während der postorogenen Aufhebung sind NNW und ENE streichende Verwerfungen entstanden.

Im mittleren Pliozän wurden im Raum zwischen Ionischem Meer und der Pindos überschiebung auf dem gefalteten und teilweise erodierten Untergrund vorwiegend limnisch-terrestrische Sedimente abgelagert. Während der postorogenen Ausweitung sind Absenkungsräume in NNW- und ENE Richtung entstanden. Sie sind vermutlich das Ergebnis von Konvektionsströmungen innerhalb der Asthenosphäre, die durch die Hellenische Subduktion hervorgerufen wurden.

Die Krustenausdehnung im ägäischen »back-arc basin« hat sich kontinuierlich gegen Westen verlagert, so da\ West-Griechenland zusätzlich von WNW streichenden Grabenstrukturen weitgehend deformiert ist.

Abstract

The post-Miocene sedimentary and structural evolution of NW-continental Greece changes from west to east.

In the west, along the Ionian coast, the tectonic activity of the Mio-Pliocene marine sedimentation is reflected in olisthostromes and intrafoliated folds. During the emergence of the area at the Pliocene/Pleistocene boundary, low angle thrusting, dissolution cleavage and open NNW to NNE trending folds, were developed. This horizontal shortening is the result of active plate convergence between the Apulian plate and the Aegean plate. Subsequent vertical movements continuing till the precent, produces mainly NNW and ENE directed faults.

In the east, between the Ionian coast and Pindus thrust, nonmarine sedimentation began, in the middle Pliocene, on a folded and partially eroded substratum. Long fault bounded intramountaneous basins formed during general uplift and extension in three directions: NNW, ENE and WNW. Extension in both areas, resulting from NNW and ENE faults, is interpreted in terms of the action of upwelling convective currents induced by the Hellenic subduction. As the Aegean back arc extension migrated slowly westwards, the whole study area was gradually affected by WNW trending grabens.

Résumé

La partie nord-occidentale de la Grèce continentale montre, d'est en ouest, une modification des processus sédimentaires et structuraux.

A l'ouest, le long de la cÔte ionienne, la sédimentation marine subsidente tardi-miocène s'est accompagnée de puissants olisthostromes et de plis intrafoliaux. La limite Pliocène-Pleistocène a vu se développer des charriages peu inclinés et des plis ouverts NNE à NNW accompagnés d'une schistosité de dissolution. Ce raccourcissement horizontal est le résultat de la convergence des plaques apulienne et égéenne. Il a été suivi de mouvements subséquents verticaux, encore actifs aujourd'hui, responsables de failles de directions NNW et ENE.

Plus à l'est, entre la cÔte ionienne et le charriage du Pinde, une sédimentation continentale s'est installée, au Pliocène moyen, sur le substratum plissé et partiellement érodé. Au cours du soulèvement post-orogénique, des bassins intramontagneux de grabens se sont formés selon trois directions: NNW, ENE et WNW. Les deux premières sont interprétées comme le résultat de courants de convection induits dans l'asthénosphère par la subduction hellénique. Les grabens WNW seraient en relation avec le déplacement progressif vers l'ouest de la zone d'extension crustale du bassin d'arrière-arc égéen.

кРАткОЕ сОДЕРжАНИЕ

кАк УстАНОВлЕНО, В гРЕ цИИ В пОжДНЕМ МИОцЕНЕ пРОцЕссы сЕДИМЕНтАцИИ И РАжВИ тИь стРУктУР ИжМЕНьУ т сВОЕ пРОстИРАНИЕ с NW НА EW.

В ВИДУ пОгРУжЕНИь жОН ы ОтлОжЕНИь В РАИОНЕ И ОНИЧЕскОгО пОБЕРЕжьь ОБРАжОВАл Ись МОЩНыЕ ОлИстОстР ОМы И ВНУтРЕННЕ РАсслАНц ОВАННыЕ склАДкИ. НА РУБЕжЕ плИОцЕНА/пл ЕИстОцЕНА ОБРАжОВАл Ись плОскИЕ НАДВИгИ, клИВ Аж РАстВОРЕНИь И ОткР ытыЕ склАДкИ, пРОстИРАУЩИ Есь В НАпРАВлЕНИьх От NNW ДО NNE. ЁтИ тЕктОНИЧЕскИЕ стРУктУРНыЕ ЕДИНИцы ьВльУтсь слЕДстВИЕМ АктИВНОИ кОНВЕРгЕНц ИИ плИт, ИМЕННО АпУлИИскОИ И Ё гЕИскОИ. ВО ВРЕМь пОсл Е ОРОгЕННОгО пОДНьтИь пОьВИлИсь с БРОсы, пРОстИРАУЩИЕс ь НА NNW-ENE.

В сРЕДНЕМ плИОцЕНЕ НА склАДЧАтОМ И ЧАстИЧН О пОДВЕРгНУВшЕМсь ЁРОжИИ УЧАсткЕ МЕжДУ ИОНИЧЕскИМ МОРЕМ И НАДВИгОМ пИНД Ос пРОИсхОДИлО ОтлОж ЕНИЕ пРЕИМУЩЕстВЕННО АлУ ВАльНО-МАтЕРИкОВых с ЕДИМЕНтОВ. ВО ВРЕМь пОслЕ ОРОгЕН НОгО РАсшИРЕНИь пОьВ ИлИсь пОгРУжЕНИь В НАпРАВл ЕНИьх NNW-ENE. ОНИ ьВИлИсь, пО-ВИДИМО МУ, РЕжУльтАтОМ кОНВЕ НкцИОННых тЕЧЕНИИ В АстЕНОсФЕР Е, ВыжВАННых ЁллИНИст ИЧЕскИМ жАсАсыВАНИЕМ.

РАсшИРЕНИЕ кОРы В ЁгЕ ИскОМ тылОВОМ БАссЕИ НЕ ОстРОВНых ДУг шлО В жА пАДНОМ НАпРАВлЕНИИ, т Ак ЧтО жАпАДНАь гРЕцИь ОкАж АлАсь ДОБАВОЧНО ДЕФО РМИРОВАНОИ И стРУктУРАМИ гРАБЕН ОВ, пРОстИРАУЩИхсь В Н АпРАВлЕНИИ WNW.

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  1. Theodor Doutsos,  Nikolaos Kontopoulos &  Dimitris Frydas

    Present address: Geological Department, University of Patras, Patras, Greece

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    1. Theodor Doutsos
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    2. Nikolaos Kontopoulos
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    3. Dimitris Frydas
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    Doutsos, T., Kontopoulos, N. & Frydas, D. Neotectonic evolution of northwestern-continental Greece. Geol Rundsch 76, 433–450 (1987). https://doi.org/10.1007/BF01821085

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