Neoproterozoic reworking of the Palaeoproterozoic Capricorn Orogen of Western Australia and implications for the amalgamation
of Rodinia
Sandra A. Occhipinti
Steven M. Reddy
10.6084/m9.figshare.3454673.v1
https://geolsoc.figshare.com/articles/journal_contribution/Neoproterozoic_reworking_of_the_Palaeoproterozoic_Capricorn_Orogen_of_Western_Australia_and_implications_for_the_amalgamation___of_Rodinia/3454673
<p>Argon isotopic data from mica from the southern Capricorn region of Western Australia record complex intra- and inter-grain
systematics that reflect modification due to a range of processes. However, <sup>40</sup>Ar/<sup>39</sup>Ar age distributions, though complex, generally show early Neoproterozoic ages in the west, increasing to Mesoproterozoic
ages in the east. Palaeoproterozoic ages associated with cooling after the <em>c.</em> 1.8 Ga Capricorn Orogen or <em>c.</em> 1.6 Ga Mangaroon Orogen are not preserved. These data reflect cooling from a <em>c</em>. 300 °C thermal overprint that took place prior to 960 Ma that is related to the enigmatic Edmundian Orogeny. These data,
combined with sediment provenance data from the Early Neoproterozoic Officer Basin and U–Pb age data from the nearby Pinjarra
Orogen, indicate that the late Mesoproterozoic–Neoproterozoic Pinjarra and Edmundian events are dynamically linked and reflect
tectonic activity on the western margin of the amalgamated West Australian Craton. The temporal framework for this event suggest
a link to the evolving Rodinian supercontinent and reflect the oblique collision of either Greater India or Kalahari cratons
with the West Australian Craton. These results illustrate that the temporal evolution of poorly preserved orogens can be constrained
by low-temperature thermochronology in the adjacent cratons.
</p>
2016-06-21 12:16:51
Craton
Kalahari cratons
Palaeoproterozoic Capricorn Orogen
Neoproterozoic reworking
Edmundian events
sediment provenance data
Rodinia Argon
Edmundian Orogeny
Neoproterozoic ages
Greater India
Pinjarra Orogen
960 Ma
cooling
Western Australia record
Rodinian supercontinent
Palaeoproterozoic ages
1.8 Ga Capricorn Orogen
Western Australia
Capricorn region
tectonic activity
1.6 Ga Mangaroon Orogen
Neoproterozoic Officer Basin
Mesoproterozoic ages
Geology