Upper crustal emplacement and deformation of granitoids inside the Uppermost Unit of the Cretan nappe stack: constraints from U–Pb zircon dating, microfabrics and paleostress analyses

Kneuker, Tilo; Dörr, Wolfgang; Petschick, Rainer; Zulauf, Gernold

doi:10.1007/s00531-014-1088-4

Cited by 11 publications

(20 citation statements)

References 39 publications

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“…This situation is in striking contrast to the situation in eastern Crete, where dioritic rocks intruded into marble at the same time, but at upper structural levels as is indicated by rock fabrics and by similar U-Pb zircon and K-Ar cooling ages (Fig. 18;Kneuker et al 2015).…”

mentioning

confidence: 54%

“…The minimum emplacement age of granodioritic magma inside the Asterousia-type marble of Anafi is 72.6 +0.1/−0.2 Ma. A late Campanian emplacement of granodiorite inside Asterousiatype marble on Anafi is also supported by the U-Pb zircon age (74.5 ± 0.25 Ma) obtained from quartzdiorite intruded into Asterousia-type marble near Pachia Ammos in eastern Crete (Kneuker et al 2015).…”

Section: Implications For the Magmatic Evolutionmentioning

confidence: 93%

“…Evidence for an igneous event during the Latest Cretaceous in rocks of the Asterousia Crystalline Complex has been reported from eastern Crete (e.g. Baranyi et al 1975;Kneuker et al 2015). Kneuker et al (2015) showed that the melt in eastern Crete should have intruded and cooled down at upper structural levels.…”

Section: Ht-lp Metamorphic and Igneous Rocks In The Southern Aegean Dmentioning

confidence: 94%

“…Baranyi et al 1975;Kneuker et al 2015). Kneuker et al (2015) showed that the melt in eastern Crete should have intruded and cooled down at upper structural levels.…”

Section: Ht-lp Metamorphic and Igneous Rocks In The Southern Aegean Dmentioning

confidence: 99%

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New structural and U–Pb zircon data from Anafi crystalline basement (Cyclades, Greece): constraints on the evolution of a Late Cretaceous magmatic arc in the Internal Hellenides

Martha

Dörr

Gerdes

et al. 2016

Int J Earth Sci (Geol Rundsch)

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comprises from bottom to top: (a) Anafi Greenschist; (b) Anafi Amphibolite Group (orthoamphibolite with intercalations of metasedimentary rocks at the base); and (c) Chalepa Group (amphibolite facies metasediments with slices of serpentinite and granitoids). LA-ICP-MS and ID-TIMS 206 Pb/ 238 U zircon ages of granodiorite from the Chalepa Group reveal several similar zircon populations suggesting continuous emplacement of granitoids inside a magmatic arc from ca. 72.5 to 79 Ma. The minimum emplacement age of granodioritic magma, deduced from the 206 Pb/ 238 U median age of the youngest zircon population, is 72.6 +0.1/−0.2 Ma. Deformation (micro)fabrics of granodiorite result from low strain obtained at T > 600 °C. This along with the U-Pb ages and published K-Ar ages indicates intrusion of the plutonic rocks at deep structural levels followed by very slow cooling. Monzogranitic dykes cutting through granodiorite in north-eastern Anafi are undeformed and yielded a 206 Pb/ 238 U median age of 69.9 +0.7/−0.7 Ma. Based on the new and published data, the following implications for the tectonometamorphic evolution on Anafi can be made: (1) obduction and accretion of mantle slices (serpentinite) to the Asterousia-type rocks were prior to amphibolite facies metamorphism; (2) intrusion of granitoids during the middle to late Campanian within a magmatic-arc setting and coeval shift of the magmatic arc towards the south; (3) Maastrichtian intrusion of dykes; (4) Palaeocene greenschist facies metamorphism and coeval ductile top-to-the SE thrusting of the Anafi Amphibolite Group on top of the Anafi Greenschist; (5) post-Eocene brittle top-to-the SE thrusting of the Anafi Greenschist and the Anafi Amphibolite Group on top of flysch sediments; (6) clockwise rotation of the system and (Early) Oligocene brittle top-to-the SE thrusting of the Chalepa Group on top of all units mentioned above; and (7) ongoing clockwise rotation of the Aegean block during Abstract The Asterousia Crystalline Complex consists of Late Cretaceous amphibolite facies metamorphic rocks and associated granitoids, which can be found in exposures on Crete and the Cyclades (Greece). It is attributed to the Uppermost Unit and therefore to the Pelagonian domain of the Internal Hellenides. The tectonometamorphic evolution of this unit is still a matter of debate. We present new structural and petrological data of Asterousiatype rocks and greenschist facies metamorphic rocks from the island of Anafi in the southern Aegean Sea as well as U-Pb zircon ages of granitoids from Anafi. The crystalline sequence of Anafi rests on top of Eocene flysch and Electronic supplementary material The online version of this article (1 3 the Oligocene to Early Miocene and change in stress field (NE-SW compression).

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mentioning

confidence: 54%

Section: Implications For the Magmatic Evolutionmentioning

confidence: 93%

Section: Ht-lp Metamorphic and Igneous Rocks In The Southern Aegean Dmentioning

confidence: 94%

“…Baranyi et al 1975;Kneuker et al 2015). Kneuker et al (2015) showed that the melt in eastern Crete should have intruded and cooled down at upper structural levels.…”

Section: Ht-lp Metamorphic and Igneous Rocks In The Southern Aegean Dmentioning

confidence: 99%

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New structural and U–Pb zircon data from Anafi crystalline basement (Cyclades, Greece): constraints on the evolution of a Late Cretaceous magmatic arc in the Internal Hellenides

Martha

Dörr

Gerdes

et al. 2016

Int J Earth Sci (Geol Rundsch)

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“…Bonneau, 1972;Krahl, Herbart & Katzenberger, 1982;Tortorici et al 2012). Amphibolite facies metamorphic rocks, intruded by Late Cretaceous granitoids (Kneuker et al 2015;Martha et al 2016Martha et al , 2017, are referred to as the Asterousia Crystalline Complex (ACC; Bonneau, 1972), which is usually correlated with the southern margin of the Pelagonian domain and therefore with the Internal Hellenides (e.g. Aubouin & Dercourt, 1965;Bonneau, 1972;Martha et al 2017).…”

Section: Introductionmentioning

confidence: 99%

The tectonometamorphic evolution of the Uppermost Unit south of the Dikti Mountains, Crete

et al. 2018

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We present a new geological map and new structural, petrographical and geochronological data from the Uppermost Unit of the Cretan nappe pile exposed south of the Dikti Mountains in eastern Crete (Greece). Based on these data, the Uppermost Unit in the study area can be subdivided (from bottom to top) into the Arvi Unit, Theodorii Greenschist and Asterousia Crystalline Complex (ACC)-type rocks. The ACC-type rocks have been affected by polyphase deformation (D1–D3) and metamorphism. Relics of the D1 phase are preserved as internal foliation in garnet porphyroblasts. D2 top-to-the SE shearing under upper amphibolite facies conditions led to the dominant foliation. After post-D2 exhumation, parts of the ACC-type rocks were affected by contact metamorphism of a non-exposed pluton, which intruded at a depth below 10 km during Campanian time (74±2Ma; laser ablation inductively coupled plasma mass spectrometry on zircon). This age, obtained from zircon of chiastolite hornfels, is in line with intrusion ages of ACC-type (meta)granitoids exposed on Crete and on Anafi. The S2-foliation of the ACC-type rocks was reactivated during the late phase of contact metamorphism by D3 top-to-the SE shearing. Latest Cretaceous cross-mica with low silicon content post-dates this shearing event. During middle Paleocene time, the ACC was thrust on top of the Theodorii Greenschist. This thrusting event as well as subsequent brittle thrusting of the greenschists and the ACC-type rocks on top of the prehnite-pumpellyite facies metamorphic Arvi Unit was still accommodated by top-to-the SE kinematics, which is the dominant kinematics of the Uppermost Unit on Crete and on Anafi.

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Maximum sedimentation ages and provenance of metasedimentary rocks from Tinos Island, Cycladic blueschist belt, Greece

Hinsken

Bröcker

Berndt

et al. 2015

Int J Earth Sci (Geol Rundsch)

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Upper crustal emplacement and deformation of granitoids inside the Uppermost Unit of the Cretan nappe stack: constraints from U–Pb zircon dating, microfabrics and paleostress analyses

Cited by 11 publications

References 39 publications

New structural and U–Pb zircon data from Anafi crystalline basement (Cyclades, Greece): constraints on the evolution of a Late Cretaceous magmatic arc in the Internal Hellenides

New structural and U–Pb zircon data from Anafi crystalline basement (Cyclades, Greece): constraints on the evolution of a Late Cretaceous magmatic arc in the Internal Hellenides

The tectonometamorphic evolution of the Uppermost Unit south of the Dikti Mountains, Crete

Maximum sedimentation ages and provenance of metasedimentary rocks from Tinos Island, Cycladic blueschist belt, Greece

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