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Chronology and evolution of the middle proterozoic albany-fraser orogen, western australia

Journal Article


Abstract


  • Geochemical and Sm-Nd isotopic data, and 19 ion-microprobe U-Pb zircon dates are reported for gneiss and granite from the eastern part of the Albany-Fraser Orogen. The orogen is dominated by granitic rocks derived from sources containing both Late Archaean and mantle-derived components. Four major plutonic episodes have been identified at ca 2630 Ma, 1700-1600 Ma, ca 1300 Ma and ca 1160 Ma. Orthogneiss, largely derived from ca 2630 Ma and 1700-1600 Ma granitic precursors, forms a belt along the southeastern margin of the Yilgam Craton. These rocks, together with gabbro of the Fraser Complex, were intruded by granitic magmas and metamorphosed in the granulite facies at ca 1300 Ma. They were then rapidly uplifted and transported westward along low-angle thrust faults over the southeastern margin of the Yilgam Craton. Between ca 1190 and 1130 Ma, granitic magmas were intruded throughout the eastern part of the orogen. These new data are integrated into a review of the geological evolution of the Albany-Fraser Orogen and adjacent margin of eastern Antarctica, and possibly related rocks in the Musgrave Complex and Gawler Craton. �� 1990 Taylor & Francis Group, LLC.

Publication Date


  • 1995

Citation


  • Nelson, D. R., Myers, J. S., & Nutman, A. P. (1995). Chronology and evolution of the middle proterozoic albany-fraser orogen, western australia. Australian Journal of Earth Sciences, 42(5), 481-495. doi:10.1080/08120099508728218

Scopus Eid


  • 2-s2.0-0029472850

Start Page


  • 481

End Page


  • 495

Volume


  • 42

Issue


  • 5

Place Of Publication


Abstract


  • Geochemical and Sm-Nd isotopic data, and 19 ion-microprobe U-Pb zircon dates are reported for gneiss and granite from the eastern part of the Albany-Fraser Orogen. The orogen is dominated by granitic rocks derived from sources containing both Late Archaean and mantle-derived components. Four major plutonic episodes have been identified at ca 2630 Ma, 1700-1600 Ma, ca 1300 Ma and ca 1160 Ma. Orthogneiss, largely derived from ca 2630 Ma and 1700-1600 Ma granitic precursors, forms a belt along the southeastern margin of the Yilgam Craton. These rocks, together with gabbro of the Fraser Complex, were intruded by granitic magmas and metamorphosed in the granulite facies at ca 1300 Ma. They were then rapidly uplifted and transported westward along low-angle thrust faults over the southeastern margin of the Yilgam Craton. Between ca 1190 and 1130 Ma, granitic magmas were intruded throughout the eastern part of the orogen. These new data are integrated into a review of the geological evolution of the Albany-Fraser Orogen and adjacent margin of eastern Antarctica, and possibly related rocks in the Musgrave Complex and Gawler Craton. �� 1990 Taylor & Francis Group, LLC.

Publication Date


  • 1995

Citation


  • Nelson, D. R., Myers, J. S., & Nutman, A. P. (1995). Chronology and evolution of the middle proterozoic albany-fraser orogen, western australia. Australian Journal of Earth Sciences, 42(5), 481-495. doi:10.1080/08120099508728218

Scopus Eid


  • 2-s2.0-0029472850

Start Page


  • 481

End Page


  • 495

Volume


  • 42

Issue


  • 5

Place Of Publication