New constraints on the tectonometamorphic evolution of the Fisher Terrane, central Prince Charles Mountains, eastern Antarctica
This item is only available electronically. The Fisher Terrane, located in the central region of the Prince Charles Mountains, east Antarctica, evolved during the Mesoproterozoic as a magmatic arc system. Metapelitic schists from the Fisher Massif were deposited after 1206 ± 49 Ma and yield metamorp...
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ftunivadelaidedl:oai:digital.library.adelaide.edu.au:2440/128283 2023-05-15T13:51:54+02:00 New constraints on the tectonometamorphic evolution of the Fisher Terrane, central Prince Charles Mountains, eastern Antarctica Van Leeuwin, A. T. dV. School of Physical Sciences Fisher Terrane, East Antarctica 2017 application/pdf http://hdl.handle.net/2440/128283 en eng http://hdl.handle.net/2440/128283 Honours Geology East Antarctica Prince Charles Mountains THERMOCALC metamorphism U–Pb geochronology tectonics Gondwana Thesis 2017 ftunivadelaidedl 2023-02-05T19:36:52Z This item is only available electronically. The Fisher Terrane, located in the central region of the Prince Charles Mountains, east Antarctica, evolved during the Mesoproterozoic as a magmatic arc system. Metapelitic schists from the Fisher Massif were deposited after 1206 ± 49 Ma and yield metamorphic monazite ages of c. 538–505 Ma relating to the regionally recognized Neoproterozoic to early Cambrian Prydz Event. Calculated phase equilibria modelling constrains the metamorphic conditions during this event to 2.6–4.0 kbar and 553–576°C, relating to apparent thermal gradients of 144 °C/kbar to 212 °C/kbar. Conditions such as these are plausibly related to metamorphism taking place in an extensional back-arc setting which was then subsequently inverted and thickened via continental collision. A migmatitic felsic gneiss from Nilsson Rocks yields metamorphic monazite 206Pb/238U ages between 1115–1050 Ma with a weighted average age of 1085.0 ± 7.1 Ma. This metamorphic event may relate to a similarly aged episode of subduction related magmatism identified elsewhere in the central Prince Charles Mountains. This study therefore presents evidence of previously unidentified Prydz-aged high-thermal gradient metamorphism in the Fisher Terrane as well as identifying an older c. 1085 Ma metamorphic event not documented elsewhere in the Prince Charles Mountains. Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2017 Thesis Antarc* Antarctica East Antarctica Prince Charles Mountains The University of Adelaide: Digital Library East Antarctica Fisher Massif ENVELOPE(67.667,67.667,-72.317,-72.317) Nilsson Rocks ENVELOPE(67.700,67.700,-71.750,-71.750) Prince Charles Mountains ENVELOPE(67.246,67.246,-71.427,-71.427) |
institution |
Open Polar |
collection |
The University of Adelaide: Digital Library |
op_collection_id |
ftunivadelaidedl |
language |
English |
topic |
Honours Geology East Antarctica Prince Charles Mountains THERMOCALC metamorphism U–Pb geochronology tectonics Gondwana |
spellingShingle |
Honours Geology East Antarctica Prince Charles Mountains THERMOCALC metamorphism U–Pb geochronology tectonics Gondwana Van Leeuwin, A. T. dV. New constraints on the tectonometamorphic evolution of the Fisher Terrane, central Prince Charles Mountains, eastern Antarctica |
topic_facet |
Honours Geology East Antarctica Prince Charles Mountains THERMOCALC metamorphism U–Pb geochronology tectonics Gondwana |
description |
This item is only available electronically. The Fisher Terrane, located in the central region of the Prince Charles Mountains, east Antarctica, evolved during the Mesoproterozoic as a magmatic arc system. Metapelitic schists from the Fisher Massif were deposited after 1206 ± 49 Ma and yield metamorphic monazite ages of c. 538–505 Ma relating to the regionally recognized Neoproterozoic to early Cambrian Prydz Event. Calculated phase equilibria modelling constrains the metamorphic conditions during this event to 2.6–4.0 kbar and 553–576°C, relating to apparent thermal gradients of 144 °C/kbar to 212 °C/kbar. Conditions such as these are plausibly related to metamorphism taking place in an extensional back-arc setting which was then subsequently inverted and thickened via continental collision. A migmatitic felsic gneiss from Nilsson Rocks yields metamorphic monazite 206Pb/238U ages between 1115–1050 Ma with a weighted average age of 1085.0 ± 7.1 Ma. This metamorphic event may relate to a similarly aged episode of subduction related magmatism identified elsewhere in the central Prince Charles Mountains. This study therefore presents evidence of previously unidentified Prydz-aged high-thermal gradient metamorphism in the Fisher Terrane as well as identifying an older c. 1085 Ma metamorphic event not documented elsewhere in the Prince Charles Mountains. Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2017 |
author2 |
School of Physical Sciences |
format |
Thesis |
author |
Van Leeuwin, A. T. dV. |
author_facet |
Van Leeuwin, A. T. dV. |
author_sort |
Van Leeuwin, A. T. dV. |
title |
New constraints on the tectonometamorphic evolution of the Fisher Terrane, central Prince Charles Mountains, eastern Antarctica |
title_short |
New constraints on the tectonometamorphic evolution of the Fisher Terrane, central Prince Charles Mountains, eastern Antarctica |
title_full |
New constraints on the tectonometamorphic evolution of the Fisher Terrane, central Prince Charles Mountains, eastern Antarctica |
title_fullStr |
New constraints on the tectonometamorphic evolution of the Fisher Terrane, central Prince Charles Mountains, eastern Antarctica |
title_full_unstemmed |
New constraints on the tectonometamorphic evolution of the Fisher Terrane, central Prince Charles Mountains, eastern Antarctica |
title_sort |
new constraints on the tectonometamorphic evolution of the fisher terrane, central prince charles mountains, eastern antarctica |
publishDate |
2017 |
url |
http://hdl.handle.net/2440/128283 |
op_coverage |
Fisher Terrane, East Antarctica |
long_lat |
ENVELOPE(67.667,67.667,-72.317,-72.317) ENVELOPE(67.700,67.700,-71.750,-71.750) ENVELOPE(67.246,67.246,-71.427,-71.427) |
geographic |
East Antarctica Fisher Massif Nilsson Rocks Prince Charles Mountains |
geographic_facet |
East Antarctica Fisher Massif Nilsson Rocks Prince Charles Mountains |
genre |
Antarc* Antarctica East Antarctica Prince Charles Mountains |
genre_facet |
Antarc* Antarctica East Antarctica Prince Charles Mountains |
op_relation |
http://hdl.handle.net/2440/128283 |
_version_ |
1766255949535772672 |