10.6084/m9.figshare.3454400.v1
Glen Phillips
Glen
Phillips
Christopher J.L. Wilson
Christopher J.L.
Wilson
David Phillips
David
Phillips
Stan K. Szczepanski
Stan K.
Szczepanski
Thermochronological (<sup>40</sup>Ar/<sup>39</sup>Ar) evidence of Early Palaeozoic basin inversion within the southern Prince Charles Mountains, East Antarctica: implications
for East Gondwana
Geological Society of London
2016
Neoproterozoic metasedimentary rocks
Synchronous cooling ages
East Antarctica
subvertical mylonite zones
Palaeozoic orogenesis
Palaeozoic basin inversion
Ar
Prince Charles Mountains
Geology
2016-06-21 12:05:48
Dataset
https://geolsoc.figshare.com/articles/dataset/Thermochronological_sup_40_sup_Ar_sup_39_sup_Ar_evidence_of_Early_Palaeozoic_basin_inversion_within_the_southern_Prince_Charles_Mountains_East_Antarctica_implications___for_East_Gondwana/3454400
<p><sup>40</sup>Ar/<sup>39</sup>Ar systematics within metasedimentary rocks exposed in the southern Prince Charles Mountains, East Antarctica, were thermally
reset during a period of Early Palaeozoic (between 524 ± 1 Ma and 486 ± 2 Ma) orogenesis. This event affected three temporally
distinct (Archaean to Neoproterozoic) stratigraphic levels that are now exposed in the upper crust. In the structural record,
evidence of orogenesis during Early Palaeozoic times is preserved as late-stage, subvertical mylonite zones in the Archaean
orthogneiss–metasedimentary basement and thin-skinned folding and thrusting of the overlying Neoproterozoic metasedimentary
rocks. Synchronous cooling ages, contrasting structural styles and similar peak metamorphic conditions are interpreted as
reflecting basement-involved thin-skinned deformation that was the result of inversion of a Neoproterozoic basin. The presence
of pre-existing crustal heterogeneities is the mechanism that localized Early Palaeozoic orogenesis within the region. This
interpretation differs from previous models that attribute Early Palaeozoic orogenesis within the southern Prince Charles
Mountains to a collisional tectonic setting. An Early Palaeozoic intra-cratonic setting for the region suggests that amalgamation
between India and Antarctica was likely to have occurred prior to the final construction of Gondwana.
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