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40Ar/39Ar thermochronology in the ios basement terrane resolves the tectonic significance of the south cyclades shear zone

Lister, Gordon; Forster, Marnie; Koudashev, Oleg; Nie, Ruoran; Yeung, Sonia

Description

We conducted 39Ar diffusion experiments using potassium feldspar from the South Cyclades Shear Zone on Ios, in the Cyclades, Aegean Sea, Greece. Irradiated samples were step-heated in an ultra-high-vacuum resistance furnace attached to a mass spectrometer, thus also allowing 40Ar/39Ar geochronology. Conjoint inversion of these datasets allowed estimation of the relevant diffusion parameters, which were then used to forward model the effect of arbitrary temperature–time histories....[Show more]

dc.contributor.authorLister, Gordon
dc.contributor.authorForster, Marnie
dc.contributor.authorKoudashev, Oleg
dc.contributor.authorNie, Ruoran
dc.contributor.authorYeung, Sonia
dc.date.accessioned2021-01-13T22:52:33Z
dc.date.available2021-01-13T22:52:33Z
dc.identifier.issn0305-8719
dc.identifier.urihttp://hdl.handle.net/1885/219340
dc.description.abstractWe conducted 39Ar diffusion experiments using potassium feldspar from the South Cyclades Shear Zone on Ios, in the Cyclades, Aegean Sea, Greece. Irradiated samples were step-heated in an ultra-high-vacuum resistance furnace attached to a mass spectrometer, thus also allowing 40Ar/39Ar geochronology. Conjoint inversion of these datasets allowed estimation of the relevant diffusion parameters, which were then used to forward model the effect of arbitrary temperature–time histories. Simulations used Monte Carlo methods to improve approximations to the observed age spectra. Two periods of rapid cooling could be inferred. The South Cyclades Shear Zone commenced operation during or shortly after the Eocene–Oligocene transition. Episodes of south-directed movement continued into Early Miocene time, however, with the footwall still hot enough to cause biotite ± garnet metamorphic mineral growth at the base of the overlying, already substantially exhumed, eclogite–blueschist unit. Since its footwall continued to cool, the South Cyclades Shear Zone was an extensional shear zone during both episodes of its operation.
dc.description.sponsorshipSupport from an Australian Research Council Discovery Project, DP120101875
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherGeological Society of London
dc.rights© 2019 The Author(s).
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourceGeological Society of London Special Publication
dc.title40Ar/39Ar thermochronology in the ios basement terrane resolves the tectonic significance of the south cyclades shear zone
dc.typeJournal article
local.description.notesImported from ARIES
dc.date.issued2020
local.identifier.absfor040303 - Geochronology
local.identifier.absfor040312 - Structural Geology
local.identifier.absfor040313 - Tectonics
local.identifier.ariespublicationa383154xPUB13752
local.publisher.urlhttp://sp.lyellcollection.org/
local.type.statusPublished Version
local.contributor.affiliationLister, Gordon, College of Science, ANU
local.contributor.affiliationForster, Margaret, College of Science, ANU
local.contributor.affiliationKoudashev, Oleg, Administrative Portfolio, ANU
local.contributor.affiliationNie, Ruoran, College of Science, ANU
local.contributor.affiliationYeung, Sonia, College of Science, ANU
local.bibliographicCitation.issue0305-8719
local.identifier.doi10.1144/SP487-2018-169
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2020-11-02T04:18:18Z
local.identifier.scopusID2-s2.0-85086464916
dcterms.accessRightsOpen Access
dc.provenance© 2019 The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). Published by The Geological Society of London. Publishing disclaimer: www.geolsoc.org.uk/pub_ethics
dc.rights.licenseCreative Commons Attribution License
CollectionsANU Research Publications

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