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Paleolatitudes of Late Triassic radiolarian cherts from Argolis, Greece: Insights on the paleogeography of the western Tethys

Paleolatitudes of Late Triassic radiolarian cherts from Argolis, Greece: Insights on the paleogeography of the western Tethys
Paleolatitudes of Late Triassic radiolarian cherts from Argolis, Greece: Insights on the paleogeography of the western Tethys
The Hellenides fold-and-thrust range comprises two subparallel ophiolite belts of Triassic to Jurassic age – the external ophiolite belt (e.g., Mirdita, Pindos, Argolis) in the west, and the internal ophiolite belt in the east – broadly separated by the continental crust units of the Korabi–Pelagonian Zone. It is still a matter of debate whether these ophiolites derived from a single ocean (Meliata–Maliac–Vardar) or mark the suture of two distinct oceanic seaways (Pindos and Meliata–Maliac–Vardar). We contribute to the resolution of this controversy by studying the Migdalitsa Ophiolitic Complex in Argolis (Greece), which contains Triassic oceanic basalts and pertains to the external (western) ophiolite belt. Three key areas were mapped and several sites were targeted for structural, biostratigraphic, and paleomagnetic analyses. Radiolarian cherts in primary or tectonic contact with oceanic basalts were dated to the Late Triassic (Carnian–Norian) using radiolarians, and provided paleomagnetic directions of primary origin carried by magnetite and hematite. The derived mean direction was corrected for sedimentary inclination shallowing and yielded a paleolatitude of ~ 22°N that was placed in a broader paleogeographic context by reconstructing Pangea at ~ 225 ± 5 Ma using a recent apparent polar wander path corrected for sedimentary inclination shallowing. The Late Triassic paleogeography of the Tethys Ocean was constrained using additional paleolatitude estimates from the literature, which we checked and corrected (when possible) for sedimentary inclination shallowing. According to our reconstruction, the Meliata–Maliac–Vardar Ocean between Adria – the promontory of Africa – and Europe represents the locus of origin of the Late Triassic Argolis ophiolitic rocks of the external ophiolite belt, presently resting in tectonic contact on the Pindos–Subpelagonian zones, which represent a deep-water trough with no substantial evidence of in situ oceanization in the Triassic.
Late Triassic, Paleomagnetism, Radiolarian biostratigraphy, Ophiolitic basalts, Argolis, Vardar, Greece
0031-0182
476-490
Muttoni, Giovanni
64a1fa07-4f1f-4138-acee-3eeec47a7b10
Tartarotti, Paola
7b14ab6a-465b-4572-9990-23edacb4e308
Chiari, Marco
c80333e7-bf22-4d0c-b684-fe174b703f53
Marieni, Chiara
3b6d4e99-c548-46c1-80a6-e849050f55f0
Rodelli, Daniel
960e330b-65d2-4b5a-ad36-531bd78c93f7
Dallanave, Edoardo
c5eb5e21-3ac9-4afd-9247-f208b4d73a77
Kirscher, Uwe
51041deb-f75c-444d-9a92-1d78a6cb2f19
Muttoni, Giovanni
64a1fa07-4f1f-4138-acee-3eeec47a7b10
Tartarotti, Paola
7b14ab6a-465b-4572-9990-23edacb4e308
Chiari, Marco
c80333e7-bf22-4d0c-b684-fe174b703f53
Marieni, Chiara
3b6d4e99-c548-46c1-80a6-e849050f55f0
Rodelli, Daniel
960e330b-65d2-4b5a-ad36-531bd78c93f7
Dallanave, Edoardo
c5eb5e21-3ac9-4afd-9247-f208b4d73a77
Kirscher, Uwe
51041deb-f75c-444d-9a92-1d78a6cb2f19

Muttoni, Giovanni, Tartarotti, Paola, Chiari, Marco, Marieni, Chiara, Rodelli, Daniel, Dallanave, Edoardo and Kirscher, Uwe (2015) Paleolatitudes of Late Triassic radiolarian cherts from Argolis, Greece: Insights on the paleogeography of the western Tethys. Palaeogeography, Palaeoclimatology, Palaeoecology, 417, 476-490. (doi:10.1016/j.palaeo.2014.10.010).

Record type: Article

Abstract

The Hellenides fold-and-thrust range comprises two subparallel ophiolite belts of Triassic to Jurassic age – the external ophiolite belt (e.g., Mirdita, Pindos, Argolis) in the west, and the internal ophiolite belt in the east – broadly separated by the continental crust units of the Korabi–Pelagonian Zone. It is still a matter of debate whether these ophiolites derived from a single ocean (Meliata–Maliac–Vardar) or mark the suture of two distinct oceanic seaways (Pindos and Meliata–Maliac–Vardar). We contribute to the resolution of this controversy by studying the Migdalitsa Ophiolitic Complex in Argolis (Greece), which contains Triassic oceanic basalts and pertains to the external (western) ophiolite belt. Three key areas were mapped and several sites were targeted for structural, biostratigraphic, and paleomagnetic analyses. Radiolarian cherts in primary or tectonic contact with oceanic basalts were dated to the Late Triassic (Carnian–Norian) using radiolarians, and provided paleomagnetic directions of primary origin carried by magnetite and hematite. The derived mean direction was corrected for sedimentary inclination shallowing and yielded a paleolatitude of ~ 22°N that was placed in a broader paleogeographic context by reconstructing Pangea at ~ 225 ± 5 Ma using a recent apparent polar wander path corrected for sedimentary inclination shallowing. The Late Triassic paleogeography of the Tethys Ocean was constrained using additional paleolatitude estimates from the literature, which we checked and corrected (when possible) for sedimentary inclination shallowing. According to our reconstruction, the Meliata–Maliac–Vardar Ocean between Adria – the promontory of Africa – and Europe represents the locus of origin of the Late Triassic Argolis ophiolitic rocks of the external ophiolite belt, presently resting in tectonic contact on the Pindos–Subpelagonian zones, which represent a deep-water trough with no substantial evidence of in situ oceanization in the Triassic.

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Published date: 1 January 2015
Keywords: Late Triassic, Paleomagnetism, Radiolarian biostratigraphy, Ophiolitic basalts, Argolis, Vardar, Greece
Organisations: Geochemistry

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Local EPrints ID: 374980
URI: http://eprints.soton.ac.uk/id/eprint/374980
ISSN: 0031-0182
PURE UUID: 62b1e12d-d1a1-426c-a410-4977c7020015

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Date deposited: 06 Mar 2015 15:46
Last modified: 15 Jul 2019 21:27

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Contributors

Author: Giovanni Muttoni
Author: Paola Tartarotti
Author: Marco Chiari
Author: Chiara Marieni
Author: Daniel Rodelli
Author: Edoardo Dallanave
Author: Uwe Kirscher

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