The Auriga Nunataks shear zone: Mesozoic transfer faulting and arc deformation in northwest Palmer Land, Antarctica

Vaughan, Alan P. M.; Millar, Ian L.; Thistlewood, Laurence

doi:10.1029/1999tc900008

Cited by 16 publications

(17 citation statements)

References 55 publications

(10 reference statements)

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“…This would have had the effect of uplifting and rejuvenating the sea-floor, reducing its thermal age and causing increased coupling between the overriding and subducting plate (Vaughan, 1995). In support of this, the new age for Eastern Palmer Land Shear Zone movement is within error of a major phase of uplift and basin shoaling at c. 100 Ma on Alexander Island , and overlaps in age with ductile, W-directed thrusting with associated transfer faulting in western Palmer Land (Vaughan, Millar & Thistlewood, 1999). In support of this, the new age for Eastern Palmer Land Shear Zone movement is within error of a major phase of uplift and basin shoaling at c. 100 Ma on Alexander Island , and overlaps in age with ductile, W-directed thrusting with associated transfer faulting in western Palmer Land (Vaughan, Millar & Thistlewood, 1999).…”

Section: Discussionmentioning

confidence: 90%

Mid-Cretaceous ductile deformation on the Eastern Palmer Land Shear Zone, Antarctica, and implications for timing of Mesozoic terrane collision

2002

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Ar-Ar dating of high-strain ductile mylonites of the Eastern Palmer Land Shear Zone in the southern Antarctic Peninsula indicates that reverse movement on the shear zone occurred in late Early Cretaceous times (Albian), and not latest Jurassic times as previously supposed. The Eastern Palmer Land Shear Zone forms a major tectonic boundary, separating suspect arc terranes from rocks of Gondwana continental affinity. The dated mylonites are developed in Lower Jurassic plutonic rocks at Mount Sullivan, eastern Palmer Land, and form part of a zone of ductile reverse deformation up to 25 km wide. Biotite from a fine-grained mafic mylonite yields an Ar-Ar cooling age of 102.8 ± 3.3 Ma. Movement of this age on the Eastern Palmer Land Shear Zone is coeval with circum-Pacific deformation, possibly related to a mantle superplume event, and provides support for allochthonousterrane models for the Antarctic Peninsula with accretion in post-Early Cretaceous times.

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Section: Discussionmentioning

confidence: 90%

Mid-Cretaceous ductile deformation on the Eastern Palmer Land Shear Zone, Antarctica, and implications for timing of Mesozoic terrane collision

2002

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“…When Vaughan & Storey (2000) defined the terrane model for the Antarctic Peninsula, the oldest recognized in situ rocks from the Eastern Domain were Devonian (c. 393 Ma) and Carboniferous (c. 323 Ma) intensely deformed granitoid gneisses from Target Hill , whereas in the Central Domain they were preLate Triassic granitoid gneisses and marble breccias from the metamorphic basement in NW Palmer Land Vaughan et al 1999). However, subsequent studies Riley et al 2012b) have identified Silurian orthogneisses from the Central Domain in NW Palmer Land (422 ± 18 Ma) and Ordovician orthogneisses from eastern Graham Land (487 ± 3 Ma).…”

Section: Lithological and Sedimentary Provenance Correlations Betweenmentioning

confidence: 99%

Autochthonous v. accreted terrane development of continental margins: a revised in situ tectonic history of the Antarctic Peninsula

Burton‐Johnson

Riley

2015

JGS

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The allochthonous terrane accretion model previously proposed for the geological development of the Antarctic Peninsula continental margin arc is reviewed in light of recent data and the geology is reinterpreted as having evolved as an in situ continental arc. This is based upon the following factors: (1) the presence of Early Palaeozoic basement and stratigraphic correlation of sequences between the autochthonous and previously proposed allochthonous terranes; (2) isotopic evidence for similar deep crustal structure across the different terranes; (3) ocean island basalt magmas and deep marine sedimentary rocks formed during continental margin extension within the previously proposed accretionary wedge sequence (i.e. not formed against an active oceanic arc); (4) the distribution of magnetic susceptibility measurements and aeromagnetic data locating the palaeo-subduction zone along the west of the Peninsula; (5) a lack of clear palaeomagnetic distinction between the terranes. The following alternative tectonic history is proposed: (1) amalgamation and persistence of Gondwana; (2) subsequent silicic large igneous province magmatism and extension; (3) development and history of Andean subduction until its cessation in the Cenozoic. A number of features in the Antarctic Peninsula correlate with those of other circum-Pacific margins, supporting a global evaluation of allochthonous v. autochthonous margin development to aid our understanding of crustal growth mechanisms.

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“…In the Central Domain terrane (Vaughan & Storey 2000) in northwest Palmer Land, a major flower structure, forming a sinistral transpressional transfer zone, deforms Cretaceous gabbro, Late Triassic granodiorite and marble tectonic breccia of unknown age (Vaughan et al 1999). Biotite cooling ages in deformed gabbro and mafic dykes from the flower structure date sinistral shear and thrusting there at ~110 Ma (Vaughan et al 1999).…”

Section: Antarctic Peninsulamentioning

confidence: 99%

Episodicity of Mesozoic terrane accretion along the Pacific margin of Gondwana: implications for superplume-plate interactions

Vaughan

Livermore

2005

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A review of evidence for deformation and terrane accretion on the Late Triassic-Early Jurassic margins of Pangaea and the mid-Cretaceous margins of the palaeo-Pacific ocean shows that deformation was global and synchronous with probable superplume events. Late Triassic-Early Jurassic deformation appears to be concentrated in the period 202–197 Ma and was coeval with eruption of the Central Atlantic Magmatic Province, onset of Pangaea break-up, a period of extended normal magnetic polarity and a major mass extinction event, all possible expressions of a superplume event. Mid-Cretaceous deformation occurred in two brief periods, the first from approximately 116 Ma to 110 Ma in the west palaeo-Pacific and the second from roughly 105 Ma to 99 Ma in the east palaeo-Pacific, with both events possibly represented in northeast Siberia. This deformation was coeval with eruption of major oceanic plateaux, core-complex formation and rifting of New Zealand from Gondwana, the Cretaceous normal polarity epoch, and a major radiation of flowering plants and several animal groups, all linked with the mid-Cretaceous superplume event. A simple unifying mechanism is presented suggesting that large continental or oceanic plates, when impacted by a superplume, tend to break-up/reorganize, associated with gravitational spreading away from a broad, thermally generated topographic high and with a resulting short-lived pulse of plate-marginal deformation and terrane accretion.

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The Auriga Nunataks shear zone: Mesozoic transfer faulting and arc deformation in northwest Palmer Land, Antarctica

Cited by 16 publications

References 55 publications

Mid-Cretaceous ductile deformation on the Eastern Palmer Land Shear Zone, Antarctica, and implications for timing of Mesozoic terrane collision

Mid-Cretaceous ductile deformation on the Eastern Palmer Land Shear Zone, Antarctica, and implications for timing of Mesozoic terrane collision

Autochthonous v. accreted terrane development of continental margins: a revised in situ tectonic history of the Antarctic Peninsula

Episodicity of Mesozoic terrane accretion along the Pacific margin of Gondwana: implications for superplume-plate interactions

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