Recognition of Pan-African-aged metamorphism in the Fisher Terrane, central Prince Charles Mountains, East Antarctica
The Precambrian tectonic architecture of the East Antarctic Shield is subject to considerable uncertainty because of limited outcrop. The Fisher Terrane, located in the central region of the Prince Charles Mountains, evolved during the Mesoproterozoic as a volcanic arc system and provides key data a...
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ftunivadelaidedl:oai:digital.library.adelaide.edu.au:2440/121031 2023-12-17T10:18:46+01:00 Recognition of Pan-African-aged metamorphism in the Fisher Terrane, central Prince Charles Mountains, East Antarctica De Vries Van Leeuwen, A.T. Morrissey, L.J. Kelsey, D.E. Raimondo, T. 2019 http://hdl.handle.net/2440/121031 https://doi.org/10.1144/jgs2018-146 en eng Geological Society of London http://purl.org/au-research/grants/arc/DP160101006 Journal of the Geological Society, 2019; 176(4):785-798 0016-7649 2041-479X http://hdl.handle.net/2440/121031 doi:10.1144/jgs2018-146 De Vries Van Leeuwen, A.T. [0000-0003-4988-4153] Morrissey, L.J. [0000-0001-7506-6117] Raimondo, T. [0000-0001-9115-9196] © 2019 The Author(s). Published by The Geological Society of London. All rights reserved. For permissions: http://www.geolsoc.org.uk/permissions. http://dx.doi.org/10.1144/jgs2018-146 Journal article 2019 ftunivadelaidedl https://doi.org/10.1144/jgs2018-146 2023-11-20T23:27:01Z The Precambrian tectonic architecture of the East Antarctic Shield is subject to considerable uncertainty because of limited outcrop. The Fisher Terrane, located in the central region of the Prince Charles Mountains, evolved during the Mesoproterozoic as a volcanic arc system and provides key data about the evolution of this region. Our study provides evidence that the Fisher Terrane formed in proximity to a Proterozoic plate boundary and was subsequently metamorphosed during the late Neoproterozoic to early Cambrian during the final stages of Gondwana amalgamation. U–Pb detrital zircon geochronology reveals that metasedimentary rocks from within a metasedimentary–metavolcanic package cropping out at Fisher Massif were deposited after c. 1300 Ma, and contain detritus derived from the Rayner–Eastern Ghats Terrane. This suggests that the Fisher Terrane was not an isolated oceanic arc but rather formed on the same tectonic plate as the Rayner Complex. Metapelitic schists from within the same metasedimentary package yield metamorphic U–Pb monazite ages of c. 512–509 Ma, corresponding to a regionally recognized Pan-African-aged event. This event has not been previously identified in the Fisher Terrane, and demonstrates that Pan-African-aged metamorphism affected all parts of the Prince Charles Mountains. Calculated phase equilibria modelling constrains the metamorphic conditions during this event to 2.5–4.0 kbar and 550–615°C, corresponding to apparent thermal gradients of 146–220°C kbar⁻¹. Such conditions plausibly relate to metamorphism taking place in an extensional setting. Alexander T. De Vries Van Leeuwen, Laura J. Morrissey, David E. Kelsey,Tom Raimondo Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Prince Charles Mountains The University of Adelaide: Digital Library Antarctic East Antarctica Fisher Massif ENVELOPE(67.667,67.667,-72.317,-72.317) Kelsey ENVELOPE(-22.306,-22.306,-80.448,-80.448) Prince Charles Mountains ENVELOPE(67.246,67.246,-71.427,-71.427) Rayner ENVELOPE(-45.166,-45.166,-60.650,-60.650) Journal of the Geological Society 176 4 785 798 |
institution |
Open Polar |
collection |
The University of Adelaide: Digital Library |
op_collection_id |
ftunivadelaidedl |
language |
English |
description |
The Precambrian tectonic architecture of the East Antarctic Shield is subject to considerable uncertainty because of limited outcrop. The Fisher Terrane, located in the central region of the Prince Charles Mountains, evolved during the Mesoproterozoic as a volcanic arc system and provides key data about the evolution of this region. Our study provides evidence that the Fisher Terrane formed in proximity to a Proterozoic plate boundary and was subsequently metamorphosed during the late Neoproterozoic to early Cambrian during the final stages of Gondwana amalgamation. U–Pb detrital zircon geochronology reveals that metasedimentary rocks from within a metasedimentary–metavolcanic package cropping out at Fisher Massif were deposited after c. 1300 Ma, and contain detritus derived from the Rayner–Eastern Ghats Terrane. This suggests that the Fisher Terrane was not an isolated oceanic arc but rather formed on the same tectonic plate as the Rayner Complex. Metapelitic schists from within the same metasedimentary package yield metamorphic U–Pb monazite ages of c. 512–509 Ma, corresponding to a regionally recognized Pan-African-aged event. This event has not been previously identified in the Fisher Terrane, and demonstrates that Pan-African-aged metamorphism affected all parts of the Prince Charles Mountains. Calculated phase equilibria modelling constrains the metamorphic conditions during this event to 2.5–4.0 kbar and 550–615°C, corresponding to apparent thermal gradients of 146–220°C kbar⁻¹. Such conditions plausibly relate to metamorphism taking place in an extensional setting. Alexander T. De Vries Van Leeuwen, Laura J. Morrissey, David E. Kelsey,Tom Raimondo |
format |
Article in Journal/Newspaper |
author |
De Vries Van Leeuwen, A.T. Morrissey, L.J. Kelsey, D.E. Raimondo, T. |
spellingShingle |
De Vries Van Leeuwen, A.T. Morrissey, L.J. Kelsey, D.E. Raimondo, T. Recognition of Pan-African-aged metamorphism in the Fisher Terrane, central Prince Charles Mountains, East Antarctica |
author_facet |
De Vries Van Leeuwen, A.T. Morrissey, L.J. Kelsey, D.E. Raimondo, T. |
author_sort |
De Vries Van Leeuwen, A.T. |
title |
Recognition of Pan-African-aged metamorphism in the Fisher Terrane, central Prince Charles Mountains, East Antarctica |
title_short |
Recognition of Pan-African-aged metamorphism in the Fisher Terrane, central Prince Charles Mountains, East Antarctica |
title_full |
Recognition of Pan-African-aged metamorphism in the Fisher Terrane, central Prince Charles Mountains, East Antarctica |
title_fullStr |
Recognition of Pan-African-aged metamorphism in the Fisher Terrane, central Prince Charles Mountains, East Antarctica |
title_full_unstemmed |
Recognition of Pan-African-aged metamorphism in the Fisher Terrane, central Prince Charles Mountains, East Antarctica |
title_sort |
recognition of pan-african-aged metamorphism in the fisher terrane, central prince charles mountains, east antarctica |
publisher |
Geological Society of London |
publishDate |
2019 |
url |
http://hdl.handle.net/2440/121031 https://doi.org/10.1144/jgs2018-146 |
long_lat |
ENVELOPE(67.667,67.667,-72.317,-72.317) ENVELOPE(-22.306,-22.306,-80.448,-80.448) ENVELOPE(67.246,67.246,-71.427,-71.427) ENVELOPE(-45.166,-45.166,-60.650,-60.650) |
geographic |
Antarctic East Antarctica Fisher Massif Kelsey Prince Charles Mountains Rayner |
geographic_facet |
Antarctic East Antarctica Fisher Massif Kelsey Prince Charles Mountains Rayner |
genre |
Antarc* Antarctic Antarctica East Antarctica Prince Charles Mountains |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Prince Charles Mountains |
op_source |
http://dx.doi.org/10.1144/jgs2018-146 |
op_relation |
http://purl.org/au-research/grants/arc/DP160101006 Journal of the Geological Society, 2019; 176(4):785-798 0016-7649 2041-479X http://hdl.handle.net/2440/121031 doi:10.1144/jgs2018-146 De Vries Van Leeuwen, A.T. [0000-0003-4988-4153] Morrissey, L.J. [0000-0001-7506-6117] Raimondo, T. [0000-0001-9115-9196] |
op_rights |
© 2019 The Author(s). Published by The Geological Society of London. All rights reserved. For permissions: http://www.geolsoc.org.uk/permissions. |
op_doi |
https://doi.org/10.1144/jgs2018-146 |
container_title |
Journal of the Geological Society |
container_volume |
176 |
container_issue |
4 |
container_start_page |
785 |
op_container_end_page |
798 |
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1785579212327878656 |