Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/60893
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Decoding Mesoproterozoic and Cambrian metamorphic events in Willyama Complex metapelites through the application of Sm-Nd garnet geochronology and P-T pseudosection analysis |
Author: | Clark, C. Hand, M. |
Citation: | Gondwana Research, 2010; 17(1):59-74 |
Publisher: | Int Assoc Gondwana Research |
Issue Date: | 2010 |
ISSN: | 1342-937X 1878-0571 |
Statement of Responsibility: | Chris Clark and Martin Hand |
Abstract: | The pressure-temperature (P-T) path for the Palaeoproterozoic Willyama Supergroup rocks in the Olary Domain, South Australia has been reconstructed through detailed petrographic observations, in conjunction with calculation of compositionally specific P-T pseudosections of metapelitic rock units and Sm-Nd garnet geochronology. The P-T path for the Willyama Complex has historically been interpreted to follow a single anticlockwise path, however the results of this study demonstrate that this path can be better described by two metamorphic events (M1 and M2) separated by 1100 Ma. The M1 event occurred at c. 1600 Ma and was associated with high temperature-low pressure metamorphism. Sm-Nd garnet geochronology constrains the timing of garnet growth at c. 1585 Ma. The growth of large andalusite porphroblasts during M1 exerted a first order control on the bulk composition during the subsequent M2 event. Mineral chemistries coupled with quantitative phase diagrams constrain peak conditions to be in the order of c. 550°C and 5.5 kbar during M2. The identification of two metamorphic events calls into question interpretations of metamorphic core complex formation and the single anticlockwise P-T paths being associated with the early stages of the tectonic evolution of the terrain. © 2009 Elsevier B.V. All rights reserved. |
Keywords: | THERMOCALC Polymetamorphism Delamerian Orogeny Olarian Orogeny LP–HT metamorphism |
Rights: | Copyright © 2009 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.gr.2009.09.002 |
Published version: | http://dx.doi.org/10.1016/j.gr.2009.09.002 |
Appears in Collections: | Aurora harvest 5 Earth and Environmental Sciences publications Environment Institute publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.