Combined U-Pb geochronology and Hf isotope geochemistry of detrital zircons from early Paleozoic sedimentary rocks, Ellsworth-Whitmore Mountains block, Antarctica
U-Pb detrital zircon geochronology from the upper Cambrian to Devonian part of the Ellsworth Mountains succession, Antarctica, yields dominant late Mesoproterozoic and late Neoproterozoic-Cambrian age populations that are consistent with a provenance from within Gondwana. Hf isotope compositions rev...
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Association of Engineering Geologists
2015
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/27710 2023-05-15T13:57:36+02:00 Combined U-Pb geochronology and Hf isotope geochemistry of detrital zircons from early Paleozoic sedimentary rocks, Ellsworth-Whitmore Mountains block, Antarctica Flowerdew, M J Millar, Ian L Curtis, Michael L Vaughan, A P M Horstwood, M S A Whitehouse, M.J. Fanning, Christopher 2015-12-07T22:53:06Z http://hdl.handle.net/1885/27710 unknown Association of Engineering Geologists 0016-7606 http://hdl.handle.net/1885/27710 Geological Society of America Bulletin Keywords: Detrital zircons Hafnium isotope Isotope compositions Antarctica Geochemistry Geochronology Hafnium Sedimentary rocks Uranium alloys Volcanic rocks Volcanoes Zircon Structural geology Cambrian detrital deposit Devonian geochr Absolute age Hf U-Pb Zircon provenance Journal article 2015 ftanucanberra 2015-12-28T23:22:10Z U-Pb detrital zircon geochronology from the upper Cambrian to Devonian part of the Ellsworth Mountains succession, Antarctica, yields dominant late Mesoproterozoic and late Neoproterozoic-Cambrian age populations that are consistent with a provenance from within Gondwana. Hf isotope compositions reveal a source predominantly within west Gondwana and identify a change in provenance up-stratigraphy that coincides with the change of sedimentation setting from active rift to passive margin, which has been independently determined by stratigraphic, structural, and geochemical arguments. For the Late Cambrian Frasier Ridge Formation, late Mesoproterozoic grains have positive εHf values, suggesting derivation from juvenile crust, and late Neoproterozoic-Cambrian grains have εHf values greater than -5, consistent with remelting of similar juvenile late Mesoproterozoic crust during the Pan African-Ross orogenies. Provenance during rifting was from proximal sources from within west Gondwana, most likely, southernmost Africa and basement to the Ellsworth-Whitmore Mountains block. At higher stratigraphic levels where deposition occurred along a passive margin, in the early Ordovician Mount Twiss Member and middle Devonian Mount Wyatt Earp Formation, late Neoproterozoic-Cambrian grains have εHf values less than -5; this means that early Mesoproterozoic-Archean crust was remelted to generate these zircons. Provenance was from a more expansive source region within west Gondwana, and probably included the Kaapvaal and Congo cratons of south and west Africa. Isolated outcrops of sedimentary rock of uncertain age at Mount Woollard and the Whitmore Mountains have detrital zircon signatures similar to the Frasier Ridge Formation, suggesting correlation with these Late Cambrian deposits. Sedimentary rock from the Stewart Hills contains some late Mesoproterozoic grains with lower εHf values than the previously mentioned samples. This suggests that the Stewart Hills sample has a provenance from within east Gondwana and was possibly deposited on the East Antarctic craton prior to the Ross orogeny and is not part of the displaced Ellsworth-Whitmore Mountains crustal block. Article in Journal/Newspaper Antarc* Antarctic Antarctica Australian National University: ANU Digital Collections Antarctic Ellsworth Mountains ENVELOPE(-85.000,-85.000,-78.750,-78.750) Wyatt ENVELOPE(-67.686,-67.686,-67.338,-67.338) Whitmore Mountains ENVELOPE(-104.000,-104.000,-82.500,-82.500) Wyatt Earp ENVELOPE(-86.417,-86.417,-77.567,-77.567) Twiss ENVELOPE(-85.600,-85.600,-79.383,-79.383) Mount Woollard ENVELOPE(-96.717,-96.717,-80.550,-80.550) Mount Twiss ENVELOPE(-85.600,-85.600,-79.383,-79.383) Mount Wyatt ENVELOPE(-86.417,-86.417,-77.567,-77.567) Mount Wyatt Earp ENVELOPE(-110.450,-110.450,-74.533,-74.533) Stewart Hills ENVELOPE(-86.000,-86.000,-84.167,-84.167) |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: Detrital zircons Hafnium isotope Isotope compositions Antarctica Geochemistry Geochronology Hafnium Sedimentary rocks Uranium alloys Volcanic rocks Volcanoes Zircon Structural geology Cambrian detrital deposit Devonian geochr Absolute age Hf U-Pb Zircon provenance |
spellingShingle |
Keywords: Detrital zircons Hafnium isotope Isotope compositions Antarctica Geochemistry Geochronology Hafnium Sedimentary rocks Uranium alloys Volcanic rocks Volcanoes Zircon Structural geology Cambrian detrital deposit Devonian geochr Absolute age Hf U-Pb Zircon provenance Flowerdew, M J Millar, Ian L Curtis, Michael L Vaughan, A P M Horstwood, M S A Whitehouse, M.J. Fanning, Christopher Combined U-Pb geochronology and Hf isotope geochemistry of detrital zircons from early Paleozoic sedimentary rocks, Ellsworth-Whitmore Mountains block, Antarctica |
topic_facet |
Keywords: Detrital zircons Hafnium isotope Isotope compositions Antarctica Geochemistry Geochronology Hafnium Sedimentary rocks Uranium alloys Volcanic rocks Volcanoes Zircon Structural geology Cambrian detrital deposit Devonian geochr Absolute age Hf U-Pb Zircon provenance |
description |
U-Pb detrital zircon geochronology from the upper Cambrian to Devonian part of the Ellsworth Mountains succession, Antarctica, yields dominant late Mesoproterozoic and late Neoproterozoic-Cambrian age populations that are consistent with a provenance from within Gondwana. Hf isotope compositions reveal a source predominantly within west Gondwana and identify a change in provenance up-stratigraphy that coincides with the change of sedimentation setting from active rift to passive margin, which has been independently determined by stratigraphic, structural, and geochemical arguments. For the Late Cambrian Frasier Ridge Formation, late Mesoproterozoic grains have positive εHf values, suggesting derivation from juvenile crust, and late Neoproterozoic-Cambrian grains have εHf values greater than -5, consistent with remelting of similar juvenile late Mesoproterozoic crust during the Pan African-Ross orogenies. Provenance during rifting was from proximal sources from within west Gondwana, most likely, southernmost Africa and basement to the Ellsworth-Whitmore Mountains block. At higher stratigraphic levels where deposition occurred along a passive margin, in the early Ordovician Mount Twiss Member and middle Devonian Mount Wyatt Earp Formation, late Neoproterozoic-Cambrian grains have εHf values less than -5; this means that early Mesoproterozoic-Archean crust was remelted to generate these zircons. Provenance was from a more expansive source region within west Gondwana, and probably included the Kaapvaal and Congo cratons of south and west Africa. Isolated outcrops of sedimentary rock of uncertain age at Mount Woollard and the Whitmore Mountains have detrital zircon signatures similar to the Frasier Ridge Formation, suggesting correlation with these Late Cambrian deposits. Sedimentary rock from the Stewart Hills contains some late Mesoproterozoic grains with lower εHf values than the previously mentioned samples. This suggests that the Stewart Hills sample has a provenance from within east Gondwana and was possibly deposited on the East Antarctic craton prior to the Ross orogeny and is not part of the displaced Ellsworth-Whitmore Mountains crustal block. |
format |
Article in Journal/Newspaper |
author |
Flowerdew, M J Millar, Ian L Curtis, Michael L Vaughan, A P M Horstwood, M S A Whitehouse, M.J. Fanning, Christopher |
author_facet |
Flowerdew, M J Millar, Ian L Curtis, Michael L Vaughan, A P M Horstwood, M S A Whitehouse, M.J. Fanning, Christopher |
author_sort |
Flowerdew, M J |
title |
Combined U-Pb geochronology and Hf isotope geochemistry of detrital zircons from early Paleozoic sedimentary rocks, Ellsworth-Whitmore Mountains block, Antarctica |
title_short |
Combined U-Pb geochronology and Hf isotope geochemistry of detrital zircons from early Paleozoic sedimentary rocks, Ellsworth-Whitmore Mountains block, Antarctica |
title_full |
Combined U-Pb geochronology and Hf isotope geochemistry of detrital zircons from early Paleozoic sedimentary rocks, Ellsworth-Whitmore Mountains block, Antarctica |
title_fullStr |
Combined U-Pb geochronology and Hf isotope geochemistry of detrital zircons from early Paleozoic sedimentary rocks, Ellsworth-Whitmore Mountains block, Antarctica |
title_full_unstemmed |
Combined U-Pb geochronology and Hf isotope geochemistry of detrital zircons from early Paleozoic sedimentary rocks, Ellsworth-Whitmore Mountains block, Antarctica |
title_sort |
combined u-pb geochronology and hf isotope geochemistry of detrital zircons from early paleozoic sedimentary rocks, ellsworth-whitmore mountains block, antarctica |
publisher |
Association of Engineering Geologists |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/27710 |
long_lat |
ENVELOPE(-85.000,-85.000,-78.750,-78.750) ENVELOPE(-67.686,-67.686,-67.338,-67.338) ENVELOPE(-104.000,-104.000,-82.500,-82.500) ENVELOPE(-86.417,-86.417,-77.567,-77.567) ENVELOPE(-85.600,-85.600,-79.383,-79.383) ENVELOPE(-96.717,-96.717,-80.550,-80.550) ENVELOPE(-85.600,-85.600,-79.383,-79.383) ENVELOPE(-86.417,-86.417,-77.567,-77.567) ENVELOPE(-110.450,-110.450,-74.533,-74.533) ENVELOPE(-86.000,-86.000,-84.167,-84.167) |
geographic |
Antarctic Ellsworth Mountains Wyatt Whitmore Mountains Wyatt Earp Twiss Mount Woollard Mount Twiss Mount Wyatt Mount Wyatt Earp Stewart Hills |
geographic_facet |
Antarctic Ellsworth Mountains Wyatt Whitmore Mountains Wyatt Earp Twiss Mount Woollard Mount Twiss Mount Wyatt Mount Wyatt Earp Stewart Hills |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Geological Society of America Bulletin |
op_relation |
0016-7606 http://hdl.handle.net/1885/27710 |
_version_ |
1766265302974201856 |