3 years ago

Thermal history of the northern Olympic Domain, Gawler Craton; correlations between thermochronometric data and mineralising systems

Thermal history of the northern Olympic Domain, Gawler Craton; correlations between thermochronometric data and mineralising systems
Multi-method thermochronology applied to the northern Olympic Domain of South Australia reveals a complex thermal evolution with multiple thermal events. Apatite U/Pb (closure temperature ~550 – 350 °C) and muscovite 40Ar/39Ar ages (~400 – 350 °C) record post magmatic cooling from 1850 – 750 Ma for the ~1850 Ma Donington Suite, and from ~1560 – 1500 Ma for the ~1590 Ma Hiltaba Suite and the Gawler Range Volcanics. Potassium feldspar 40Ar/39Ar ages (~350 – 150 °C) record disturbed spectra that are likely related to hydrothermal alteration at ~1000 – 650 Ma in the Neoproterozoic Adelaide Rift Complex. Apatite fission track (~60 – 120 °C), zircon (U-Th-Sm)/He (~180 – 200 °C), and apatite (U-Th-Sm)/He (~45 – 75 °C) ages reveal regional low temperature thermal events at ~1000 Ma, ~430 – 400 Ma, 350 – 330 Ma, and ~200 Ma, in addition to localised thermal events during the Cretaceous. The ~1000 Ma apatite fission track ages are amongst the oldest recorded for South Australia and are only preserved near the margins of the Olympic Domain. The ~430 – 400 Ma and ~350 – 330 Ma cooling events are interpreted to be driven by the Alice Springs Orogeny. The Mesozoic thermochronometric ages are interpreted to record localised thermal perturbations, possibly related with hydrothermal activity within the northern Olympic Domain. The presence of abundant IOCG deposits near these young thermal anomalies may indicate that these zones record more favourable thermal conditions and/or exposure levels for IOCG discoveries in the study area.

Publisher URL: www.sciencedirect.com/science

DOI: S1342937X18300030

You might also like
Never Miss Important Research

Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes.
Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.