Neoproterozoic reworking of the Palaeoproterozoic Capricorn Orogen of Western Australia and implications for the amalgamation of Rodinia

Sandra A. Occhipinti, Steven M. Reddy

Research output: Chapter in Book/Conference paperChapterpeer-review

15 Citations (Scopus)

Abstract

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, Ar-40/Ar-39 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 c. 1.8 Ga Capricorn Orogen or c. 1.6 Ga Mangaroon Orogen are not preserved. These data reflect cooling from a c. 300 degrees 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.

Original languageEnglish
Title of host publicationANCIENT OROGENS AND MODERN ANALOGUES
EditorsJB Murphy, JD Keppie, AJ Hynes
PublisherThe Geological Society Publishing House
Pages445-456
Number of pages12
DOIs
Publication statusPublished - 2009
Externally publishedYes

Publication series

NameGeological Society Special Publication
PublisherGEOLOGICAL SOC PUBLISHING HOUSE
Volume327
ISSN (Print)0305-8719

Fingerprint

Dive into the research topics of 'Neoproterozoic reworking of the Palaeoproterozoic Capricorn Orogen of Western Australia and implications for the amalgamation of Rodinia'. Together they form a unique fingerprint.

Cite this