Depositional age and correlation of the Oonah Formation: refining the timing of Neoproterozoic basin formation in Tasmania
The Proterozoic Oonah Formation comprises a thick sequence of turbidites and mafic rocks that is widely exposed in western and northern Tasmania. The regional significance of the Oonah Formation is poorly understood as its contacts are faulted and estimates of its depositional age range from 1450 Ma...
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Blackwell Publishing Asia
2018
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Online Access: | https://eprints.utas.edu.au/26126/ https://doi.org/10.1080/08120099.2018.1426629 |
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ftunivtasmania:oai:eprints.utas.edu.au:26126 2023-05-15T13:31:52+02:00 Depositional age and correlation of the Oonah Formation: refining the timing of Neoproterozoic basin formation in Tasmania Mulder, JA Berry, RF Halpin, JA Meffre, S Everard, JL 2018 https://eprints.utas.edu.au/26126/ https://doi.org/10.1080/08120099.2018.1426629 unknown Blackwell Publishing Asia Mulder, JA, Berry, RF orcid:0000-0002-5547-3396 , Halpin, JA orcid:0000-0002-4992-8681 , Meffre, S orcid:0000-0003-2741-6076 and Everard, JL 2018 , 'Depositional age and correlation of the Oonah Formation: refining the timing of Neoproterozoic basin formation in Tasmania' , Australian Journal of Earth Sciences, vol. 65, no. 3 , pp. 391-407 , doi:10.1080/08120099.2018.1426629 <http://dx.doi.org/10.1080/08120099.2018.1426629>. Oonah Formation Togari Group detrital monazite detrital zircon Tasmania southeast Australia Rodinia Neoproterozoic rifting Article PeerReviewed 2018 ftunivtasmania https://doi.org/10.1080/08120099.2018.1426629 2021-09-13T22:17:14Z The Proterozoic Oonah Formation comprises a thick sequence of turbidites and mafic rocks that is widely exposed in western and northern Tasmania. The regional significance of the Oonah Formation is poorly understood as its contacts are faulted and estimates of its depositional age range from 1450 Ma to 700 Ma. Here we refine the depositional age of the Oonah Formation and clarify its relationship to other Proterozoic sequences in Tasmania. Magmatic apatite from the syn-sedimentary Cooee Dolerite has a 207Pb-corrected 238U/206Pb age of 733 ± 9 Ma that provides a robust estimate of the depositional age of the Oonah Formation. The Oonah Formation contains abundant 750 Ma detrital monazite and has detrital zircon age populations at 1800–1700 Ma, 1590 Ma, and 1450 Ma. The new age and provenance data support the interpretation that the Oonah Formation is a lateral equivalent of the base of the Togari Group and correlatives in Tasmania. We demonstrate that the stratigraphy and provenance of Neoproterozoic strata in Tasmania differ from time-equivalent sequences in Adelaide Rift Complex but are similar to the Pahrump Group (Death Valley, California) and the Cobham Formation (Transantarctic Mountains), which supports a southwest Laurentia—Tasmania—East Antarctica connection within supercontinent Rodinia. Article in Journal/Newspaper Antarc* Antarctica East Antarctica University of Tasmania: UTas ePrints East Antarctica Transantarctic Mountains Australian Journal of Earth Sciences 65 3 391 407 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
unknown |
topic |
Oonah Formation Togari Group detrital monazite detrital zircon Tasmania southeast Australia Rodinia Neoproterozoic rifting |
spellingShingle |
Oonah Formation Togari Group detrital monazite detrital zircon Tasmania southeast Australia Rodinia Neoproterozoic rifting Mulder, JA Berry, RF Halpin, JA Meffre, S Everard, JL Depositional age and correlation of the Oonah Formation: refining the timing of Neoproterozoic basin formation in Tasmania |
topic_facet |
Oonah Formation Togari Group detrital monazite detrital zircon Tasmania southeast Australia Rodinia Neoproterozoic rifting |
description |
The Proterozoic Oonah Formation comprises a thick sequence of turbidites and mafic rocks that is widely exposed in western and northern Tasmania. The regional significance of the Oonah Formation is poorly understood as its contacts are faulted and estimates of its depositional age range from 1450 Ma to 700 Ma. Here we refine the depositional age of the Oonah Formation and clarify its relationship to other Proterozoic sequences in Tasmania. Magmatic apatite from the syn-sedimentary Cooee Dolerite has a 207Pb-corrected 238U/206Pb age of 733 ± 9 Ma that provides a robust estimate of the depositional age of the Oonah Formation. The Oonah Formation contains abundant 750 Ma detrital monazite and has detrital zircon age populations at 1800–1700 Ma, 1590 Ma, and 1450 Ma. The new age and provenance data support the interpretation that the Oonah Formation is a lateral equivalent of the base of the Togari Group and correlatives in Tasmania. We demonstrate that the stratigraphy and provenance of Neoproterozoic strata in Tasmania differ from time-equivalent sequences in Adelaide Rift Complex but are similar to the Pahrump Group (Death Valley, California) and the Cobham Formation (Transantarctic Mountains), which supports a southwest Laurentia—Tasmania—East Antarctica connection within supercontinent Rodinia. |
format |
Article in Journal/Newspaper |
author |
Mulder, JA Berry, RF Halpin, JA Meffre, S Everard, JL |
author_facet |
Mulder, JA Berry, RF Halpin, JA Meffre, S Everard, JL |
author_sort |
Mulder, JA |
title |
Depositional age and correlation of the Oonah Formation: refining the timing of Neoproterozoic basin formation in Tasmania |
title_short |
Depositional age and correlation of the Oonah Formation: refining the timing of Neoproterozoic basin formation in Tasmania |
title_full |
Depositional age and correlation of the Oonah Formation: refining the timing of Neoproterozoic basin formation in Tasmania |
title_fullStr |
Depositional age and correlation of the Oonah Formation: refining the timing of Neoproterozoic basin formation in Tasmania |
title_full_unstemmed |
Depositional age and correlation of the Oonah Formation: refining the timing of Neoproterozoic basin formation in Tasmania |
title_sort |
depositional age and correlation of the oonah formation: refining the timing of neoproterozoic basin formation in tasmania |
publisher |
Blackwell Publishing Asia |
publishDate |
2018 |
url |
https://eprints.utas.edu.au/26126/ https://doi.org/10.1080/08120099.2018.1426629 |
geographic |
East Antarctica Transantarctic Mountains |
geographic_facet |
East Antarctica Transantarctic Mountains |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_relation |
Mulder, JA, Berry, RF orcid:0000-0002-5547-3396 , Halpin, JA orcid:0000-0002-4992-8681 , Meffre, S orcid:0000-0003-2741-6076 and Everard, JL 2018 , 'Depositional age and correlation of the Oonah Formation: refining the timing of Neoproterozoic basin formation in Tasmania' , Australian Journal of Earth Sciences, vol. 65, no. 3 , pp. 391-407 , doi:10.1080/08120099.2018.1426629 <http://dx.doi.org/10.1080/08120099.2018.1426629>. |
op_doi |
https://doi.org/10.1080/08120099.2018.1426629 |
container_title |
Australian Journal of Earth Sciences |
container_volume |
65 |
container_issue |
3 |
container_start_page |
391 |
op_container_end_page |
407 |
_version_ |
1766021768487632896 |