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| Titel |
Polyphase evolution of Pelagonia (northern Greece) revealed by geological and fission-track data |
| VerfasserIn |
F. L. Schenker, M. G. Fellin, J.-P. Burg |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 1 ; Nr. 6, no. 1 (2015-02-25), S.285-302 |
| Datensatznummer |
250115403
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| Publikation (Nr.) |
 copernicus.org/se-6-285-2015.pdf |
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| Zusammenfassung |
| The Pelagonian zone, situated between the External Hellenides/Cyclades to the west and
the Axios/Vardar/Almopias zone (AVAZ) and the Rhodope to the east, was
involved in late Early Cretaceous and in Late Cretaceous–Eocene orogenic
events whose duration and extent are still controversial. This paper
constrains their late thermal imprints. New and previously published zircon
(ZFT) and apatite (AFT) fission-track ages show cooling below 240 °C
of the metamorphic western AVAZ imbricates between 102 and 93–90 Ma, of
northern Pelagonia between 86 and 68 Ma, of the eastern AVAZ at 80 Ma and
of the western Rhodope at 72 Ma. At the regional scale, this heterogeneous
cooling is coeval with subsidence of Late Cretaceous marine basin(s) that
unconformably covered the Early Cretaceous (130–110 Ma) thrust system from
100 Ma. Thrusting resumed at 70 Ma in the AVAZ and migrated across
Pelagonia to reach the External Hellenides at 40–38 Ma. Renewed thrusting
in Pelagonia is attested at 68 Ma by abrupt and rapid cooling below
240 °C and erosion of the gneissic rocks. ZFT and AFT in western and
eastern Pelagonia, respectively, testify at ~40 Ma to the latest
thermal imprint related to thrusting. Central-eastern Pelagonia cooled
rapidly and uniformly from 240 to 80 °C between 24 and 16 Ma in the
footwall of a major extensional fault. Extension started even earlier, at
~33 Ma in the western AVAZ. Post-7 Ma rapid cooling is inferred from
inverse modeling of AFT lengths. It occurred while E–W normal faults were
cutting Pliocene-to-recent sediment. |
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