The isotopic composition of zircon and garnet: A record of the metamorphic history of Naxos, Greece

Martin, Laure; Duchêne, Stéphanie; Deloule, Étienne; Vanderhaeghe, Olivier

doi:10.1016/j.lithos.2005.06.016

Cited by 92 publications

(95 citation statements)

References 40 publications

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“…The origin of the amphibolite layers in the marbles is not conclusively known, but it is widely accepted that they already existed during the high-pressure metamorphism of M1 (Avigad, 1998;Bolhar et al, 2016;Buick and Holland, 1989;Martin et al, 2006). Their present-day N-S-trending subvertical orientation in the study area is interpreted to be a result of the high-strain viscoplastic deformation during the partial melting stage of the migmatite in M2 b (Kruckenberg et al, 2010Vanderhaeghe, 2004).…”

Section: Discussionmentioning

confidence: 88%

“…Large-scale isoclinal folds and other deformation structures formed during D1 were overprinted by top-to-north shearing of D2, starting at the onset of crustal thinning and post-orogenic extension in the early Miocene (Mercier et al, 1976;Ring et al, 2010;Urai et al, 1990). As a consequence of crustal thinning and extension of the Aegean domain, the rocks of Naxos were overprinted by regional-scale greenschist metamorphism at ∼ 25 Ma (M2 a ), and more localized high-temperature, lowpressure metamorphism (M2 b ) with thermal dome formation and partial anatexis at ∼ 16 Ma (Duchene et al, 2006;Keay et al, 2001;Martin et al, 2006Martin et al, , 2008. The metamorphic grade of M2 b decreases from a high-grade migmatitic core down to greenschist facies along its fringes (Jansen and Schuiling, 1976).…”

Section: Geological Settingmentioning

confidence: 99%

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Multiphase boudinage: a case study of amphibolites in marble in the Naxos migmatite core

2018

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Abstract. In multiply deformed terrains multiphase boudinage is common, but identification and analysis of these is difficult. Here we present an analysis of multiphase boudinage and fold structures in deformed amphibolite layers in marble from the migmatitic centre of the Naxos metamorphic core complex. Overprinting between multiple boudinage generations is shown in exceptional 3-D outcrop. We identify five generations of boudinage, reflecting the transition from high-strain high-temperature ductile deformation to medium-to low-strain brittle boudins formed during cooling and exhumation. All boudin generations indicate E-W horizontal shortening and variable direction of bedding parallel extension, evolving from subvertical extension in the earliest boudins to subhorizontal N-S extension during exhumation. Two phases of E-W shortening can be inferred, the first associated with lower crustal synmigmatic convergent flow and the second associated with exhumation and N-S extension, possibly related to movement of the North Anatolian Fault.

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Section: Discussionmentioning

confidence: 88%

Section: Geological Settingmentioning

confidence: 99%

Multiphase boudinage: a case study of amphibolites in marble in the Naxos migmatite core

2018

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“…This interpretation is consistent with studies in the two islands surrounding Mykonos. In Naxos island to the south, the formation of the migmatitic core complex is considered to be older than 20-21 Ma by U/Pb dating on zircon crystals from migmatite samples ( [Keay et al, 2001] and [Martin et al, 2006]) and the roof of the dome is intruded by a granodioritic pluton dated around 12 Ma ( [Andriessen et al, 1979], [Keay et al, 2001] and [Wijbrans and McDougall, 1986]). To the north, in the relative low-temperature greenschist facies dome of Tinos, initiation of boudinage and top to the NE shearing started some 30 Ma ago ( [Bröcker, 1990], [Bröcker and Franz, 1998] and [Parra et al, 2002]) and the top of the dome was later intruded by a pluton dated about 14-15 Ma ( [Avigad and Garfunkel, 1989] and [Brichau et al, 2007]).…”

Section: Limited Triggering Effect Of Granitic Intrusion On the Develmentioning

confidence: 99%

Granite intrusion in a metamorphic core complex: The example of the Mykonos laccolith (Cyclades, Greece)

et al. 2011

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The Aegean domain is a well-suited place to study the formation of metamorphic core complex (MCC) and to investigate the role of syn-tectonic granites on their development. In the northern Cyclades, the Mykonos-Delos-Rhenia MCC is characterized by the intrusion of a kilometer-scale Late Miocene pluton of I-type granitoids within a migmatitic gneiss dome. New combined AMS (anisotropy of magnetic susceptibility) and microstructural studies on the Mykonos granitoids together with recently published thermochronological data allow us to use the granitoids as strain markers.The Mykonos granitoids form a laccolith-like intrusion with a N70°E long axis. The laccolith is strongly asymmetric with an outlying root zone to the SW and a major body mainly developed to the NE. The laccolith construction is due to successive pulses of more or less differentiated magma that intruded the Cycladic Blueschist Unit. The attitude of stretching markers suggests an important (about 60°) vertical-axis local rotation phenomenon in the cycladic upper crust during the exhumation of the Mykonos MCC. Structural data suggest a four-stage evolution of the Mykonos MCC: (i) a first stage characterized by flat shearing toward the N-NE and by the formation of a domal structure in migmatitic paragneisses with multi-scale generation of folds with axes either perpendicular or parallel to the regional stretching, as a result of the interplay between regional N20°E-directed extension and EW shortening; (ii) a second stage marked by the emplacement of the Mykonos laccolith at 13.5 ± 0.3 Ma at the top of the migmatitic paragneisses; (iii) the third stage corresponding to the development of protomylonitic foliations and lineations in the whole laccolith in high to medium temperature conditions; and (iv) the late stage marked by an acceleration of the exhumation of the Mykonos MCC. This exhumation was accommodated by important rotations of upper crustal blocks. During the end of the exhumation processes, around 10 Ma, deformation localized at the top of the laccolith in semi-ductile conditions and then in brittle conditions in the major detachment plane.Our study shows that the Cycladic plutonism event had no role on the initiation of the MCC. However, the geometry of the Mykonos intrusion supports that the magmas are "sucked" into the direction of regional extension and that the intrusion of magmas has caused an acceleration of the last stages of the MCC development. This acceleration was marked by a very fast exhumation of the laccolith after its emplacement.

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“…The origin of the amphibolite layers in the marbles is not conclusively known, but it is widely accepted that they have already existed during the high pressure metamorphism of M1 (Avigad, 1998;Bolhar et al, 2016;Buick and Holland, 1989;Martin et al, 2006). Their present day N-S trending subvertical orientation in the study area is interpreted to be a result of the high strain viscoplastic deformation during the partial melting stage of the migmatite in M2b (Kruckenberg et al, 2010Vanderhaeghe, 2004).…”

Section: All Boudin Generations Indicate E-w Shortening With Differenmentioning

confidence: 98%

“…As a consequence of crustal thinning and extension of the Aegaen domain the rocks of Naxos 30 were overprinted by regional scale greenschist metamorphism at ~25 Ma (M2 a ), and more localized high temperature -low pressure metamorphism (M2 b ) with thermal dome formation and partial anatexis at ~16 Ma (Duchene et al, 2006;Keay et al, 2001;Martin et al, 2006Martin et al, , 2008. The metamorphic grade of M2 b decreases from a high grade migmatitic core down to greenschist facies along its fringes (Jansen and Schuiling, 1976).…”

Section: Geological Settingmentioning

confidence: 99%

Multiphase Boudinage: a case study of Amphibolites in Marble in the Naxos Migmatite core

Virgo

Hagke

Urai

2017

Solid Earth Discuss.

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In multiply deformed terrains, multiphase boudinage should be common, but identification and analysis of these is difficult.Here we present an analysis of multiphase boudinage and fold structures in deformed amphibolite layers in marble from the migmatitic center of the Naxos metamorphic core complex. Reconstruction of multiple boudinage generations is possible due to the exceptional 3D outcrop conditions. We identify five distinct generations of boudinage, reflecting the transition 10 from high-strain -high-temperature ductile deformation to medium to low strain brittle boudins on the retrograde path during cooling and exhumation. All boudin generations indicate E-W horizontal shortening and variable directions of bedding parallel extension, evolving from subvertical extension in the earliest boudins to subhorizontal N-S extension during exhumation. Two phases of E-W shortening can be inferred, indicating E-W shortening in the Aegean before activity of the brittle North Anatolian Fault. This study highlights the wealth of information that can be gained from detailed analysis of 15 multiphase boudinage structures.

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The isotopic composition of zircon and garnet: A record of the metamorphic history of Naxos, Greece

Cited by 92 publications

References 40 publications

Multiphase boudinage: a case study of amphibolites in marble in the Naxos migmatite core

Multiphase boudinage: a case study of amphibolites in marble in the Naxos migmatite core

Granite intrusion in a metamorphic core complex: The example of the Mykonos laccolith (Cyclades, Greece)

Multiphase Boudinage: a case study of Amphibolites in Marble in the Naxos Migmatite core

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