K—Ar dating of the Anakie Metamorphic Group: Evidence for an extension of the Delamerian Orogeny into central Queensland

• Published in: Australian Journal of Earth Sciences
• Main Authors: Withnall, I. W., Rees, I. D., Golding, S. D., Dobos, S. K.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Informa UK Limited 1996
• Subjects: Anakie Inlier; Anakie Metamorphic Group; Cambrian; Delamerian Orogeny; Geochronology; Neoproterozoic; Potassium-argon dating; Queensland; 1900 Earth and Planetary Sciences; 1901 Earth and Planetary Sciences (miscellaneous); Antarc*; Antarctica
• Online Access: https://espace.library.uq.edu.au/view/UQ:712176

The Anakie Metamorphic Group of central Queensland is a multiply deformed sequence of psammitic to pelitic metasedimentary and mafic igneous rocks. Although the depositional age is still uncertain, this paper presents K-Ar dates from four samples which indicate that the sequence was deformed at about 500 Ma in the Middle Cambrian, and thus forms part of the Delamerian-Ross Orogen of southern Australia and eastern Antarctica. Lithologically and structurally similar rocks in the Lolworth-Ravenswood Province, farther north in Queensland, may also be part of this belt. The significance of an older age of about 540 Ma from a fifth sample is uncertain. A sixth sample gave a younger age of about 470 Ma and may be partly reset.