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Complex continental growth along the proto-Pacific margin of East Gondwana

Rawlinson, Nicholas; Arroucau, Pierre; Musgrave, Robert; Cayley, R.A.; Young, Mallory; Salmon, Michelle

Description

We use ambient noise recordings from the largest transportable seismic array in the Southern Hemisphere to image azimuthal variations in Rayleigh wave phase anisotropy in the crust beneath southeast Australia. This region incorporates a transition from the Precambrian shield region of Australia in the west to younger Phanerozoic terranes in the east, which are thought to have been formed by subduction-accretion processes. Our results, which span the shallow to lower crust, show a strong and...[Show more]

dc.contributor.authorRawlinson, Nicholas
dc.contributor.authorArroucau, Pierre
dc.contributor.authorMusgrave, Robert
dc.contributor.authorCayley, R.A.
dc.contributor.authorYoung, Mallory
dc.contributor.authorSalmon, Michelle
dc.date.accessioned2015-12-13T22:31:06Z
dc.identifier.issn0091-7613
dc.identifier.urihttp://hdl.handle.net/1885/75140
dc.description.abstractWe use ambient noise recordings from the largest transportable seismic array in the Southern Hemisphere to image azimuthal variations in Rayleigh wave phase anisotropy in the crust beneath southeast Australia. This region incorporates a transition from the Precambrian shield region of Australia in the west to younger Phanerozoic terranes in the east, which are thought to have been formed by subduction-accretion processes. Our results, which span the shallow to lower crust, show a strong and consistent pattern of anisotropy that is oriented north-south, approximately parallel to the former margin of East Gondwana. However, significant deviations from this trend persist through the period range 2.5 s to >10 s. One of the most notable deviations occurs along the edge of cratonic Australia, where the Curnamona Province forms a salient into the younger accretionary terrane, here, the fast axis of anisotropy follows the boundary almost exactly, and is virtually coincident with magnetic lineations extracted from aeromagnetic data. To the east of this boundary beneath the Lachlan orogen, a region masked by the Cenozoic Murray Basin, the fast axis of anisotropy becomes strongly curved and traces out a semicircular pattern with a radius of 200-250 km. Farther east, the fast axis of anisotropy returns to a dominantly north-south orientation. These new findings provide strong observational support to recent geodynamic modeling results that demonstrate how large-scale oroclinal structures can become embedded in accretionary mountain belts.
dc.publisherGeological Society of America Inc
dc.sourceGeology
dc.titleComplex continental growth along the proto-Pacific margin of East Gondwana
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume42
dc.date.issued2014
local.identifier.absfor040407 - Seismology and Seismic Exploration
local.identifier.absfor040313 - Tectonics
local.identifier.ariespublicationU3488905xPUB4486
local.type.statusPublished Version
local.contributor.affiliationRawlinson, Nicholas, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationArroucau, Pierre, University of Lisboa
local.contributor.affiliationMusgrave, Robert, Geological Survey of New South Wales
local.contributor.affiliationCayley, R.A., Geological Survey of Victoria
local.contributor.affiliationYoung, Mallory, DownUnder GeoSolutions
local.contributor.affiliationSalmon, Michelle, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue9
local.bibliographicCitation.startpage783
local.bibliographicCitation.lastpage786
local.identifier.doi10.1130/G35766.1
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2015-12-11T08:58:56Z
local.identifier.scopusID2-s2.0-84906658263
local.identifier.thomsonID000345362100012
CollectionsANU Research Publications

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