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 due to 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...
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ftdatacite:10.6084/m9.figshare.c.4392710 2023-05-15T13:46:18+02:00 Recognition of Pan-African-aged metamorphism in the Fisher Terrane, central Prince Charles Mountains, East Antarctica Leeuwen, Alexander T. De Vries Van Morrissey, Laura J. Kelsey, David E. Raimondo, Tom 2019 https://dx.doi.org/10.6084/m9.figshare.c.4392710 https://geolsoc.figshare.com/collections/Recognition_of_Pan-African-aged_metamorphism_in_the_Fisher_Terrane_central_Prince_Charles_Mountains_East_Antarctica/4392710 unknown Figshare https://dx.doi.org/10.1144/jgs2018-146 CC BY 4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2019 ftdatacite https://doi.org/10.6084/m9.figshare.c.4392710 https://doi.org/10.1144/jgs2018-146 2021-11-05T12:55:41Z The Precambrian tectonic architecture of the East Antarctic Shield is subject to considerable uncertainty due to 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 outcropping 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 recognised 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. Such conditions plausibly relate to metamorphism taking place in an extensional setting. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Prince Charles Mountains DataCite Metadata Store (German National Library of Science and Technology) Antarctic East Antarctica Prince Charles Mountains ENVELOPE(67.246,67.246,-71.427,-71.427) Rayner ENVELOPE(-45.166,-45.166,-60.650,-60.650) Fisher Massif ENVELOPE(67.667,67.667,-72.317,-72.317) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences Leeuwen, Alexander T. De Vries Van Morrissey, Laura J. Kelsey, David E. Raimondo, Tom Recognition of Pan-African-aged metamorphism in the Fisher Terrane, central Prince Charles Mountains, East Antarctica |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
The Precambrian tectonic architecture of the East Antarctic Shield is subject to considerable uncertainty due to 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 outcropping 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 recognised 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. Such conditions plausibly relate to metamorphism taking place in an extensional setting. |
format |
Article in Journal/Newspaper |
author |
Leeuwen, Alexander T. De Vries Van Morrissey, Laura J. Kelsey, David E. Raimondo, Tom |
author_facet |
Leeuwen, Alexander T. De Vries Van Morrissey, Laura J. Kelsey, David E. Raimondo, Tom |
author_sort |
Leeuwen, Alexander T. De Vries Van |
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 |
Figshare |
publishDate |
2019 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.4392710 https://geolsoc.figshare.com/collections/Recognition_of_Pan-African-aged_metamorphism_in_the_Fisher_Terrane_central_Prince_Charles_Mountains_East_Antarctica/4392710 |
long_lat |
ENVELOPE(67.246,67.246,-71.427,-71.427) ENVELOPE(-45.166,-45.166,-60.650,-60.650) ENVELOPE(67.667,67.667,-72.317,-72.317) |
geographic |
Antarctic East Antarctica Prince Charles Mountains Rayner Fisher Massif |
geographic_facet |
Antarctic East Antarctica Prince Charles Mountains Rayner Fisher Massif |
genre |
Antarc* Antarctic Antarctica East Antarctica Prince Charles Mountains |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Prince Charles Mountains |
op_relation |
https://dx.doi.org/10.1144/jgs2018-146 |
op_rights |
CC BY 4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.4392710 https://doi.org/10.1144/jgs2018-146 |
_version_ |
1766239923422101504 |