Isotopic and petrographic study of the Lonely Ridge Granodiorite, Nilsen Plateau, Antarctica
The Lonely Ridge Granodiorite is found on the Nilsen Plateau, which is located just south of the Amundsen Glacier in the central Transantarctic Mountains. The time of crystallization based on the Rb-Sr whole rock isochron method has been reported as approximately 620 m.y. ago. (Faure et al.) Subsequ...
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The Ohio State University
1979
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ftohiostateu:oai:kb.osu.edu:1811/69251 2023-05-15T13:22:48+02:00 Isotopic and petrographic study of the Lonely Ridge Granodiorite, Nilsen Plateau, Antarctica Felder, Robert Paul Faure, Gunter 1979-03 application/pdf http://hdl.handle.net/1811/69251 en_US eng The Ohio State University The Ohio State University. Department of Geology and Mineralogy Senior Theses; 1979 http://hdl.handle.net/1811/69251 Thesis 1979 ftohiostateu 2020-08-22T19:07:14Z The Lonely Ridge Granodiorite is found on the Nilsen Plateau, which is located just south of the Amundsen Glacier in the central Transantarctic Mountains. The time of crystallization based on the Rb-Sr whole rock isochron method has been reported as approximately 620 m.y. ago. (Faure et al.) Subsequent to crystallization, the rock was subjected to a period of high pressure metamorphism resulting in intensive deformation. Evidence for this is found in thin sections containing strained biotite and quartz showing undulatory extinction, and an overall cataclastic texture. A date of 476 m.y. was calculated for biotite using an assumed initial ^87Sr/^86Sr ratio of 0.704. This date represents the time elapsed since biotite last cooled to the temperature at which it can retain radiogenic ^87Sr, following a metamorphic event. An analysis of feldspar suggests lack of isotopic homogenization among the minerals. The results of this study do not confirm the Rb-Sr date of 850 m.y. of McClelland. No embargo Thesis Amundsen Glacier Antarc* Antarctica Ohio State University (OSU): Knowledge Bank Amundsen Glacier ENVELOPE(-159.000,-159.000,-85.583,-85.583) Faure ENVELOPE(-68.871,-68.871,-68.093,-68.093) Nilsen Plateau ENVELOPE(-158.000,-158.000,-86.333,-86.333) Transantarctic Mountains |
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Open Polar |
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Ohio State University (OSU): Knowledge Bank |
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ftohiostateu |
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English |
description |
The Lonely Ridge Granodiorite is found on the Nilsen Plateau, which is located just south of the Amundsen Glacier in the central Transantarctic Mountains. The time of crystallization based on the Rb-Sr whole rock isochron method has been reported as approximately 620 m.y. ago. (Faure et al.) Subsequent to crystallization, the rock was subjected to a period of high pressure metamorphism resulting in intensive deformation. Evidence for this is found in thin sections containing strained biotite and quartz showing undulatory extinction, and an overall cataclastic texture. A date of 476 m.y. was calculated for biotite using an assumed initial ^87Sr/^86Sr ratio of 0.704. This date represents the time elapsed since biotite last cooled to the temperature at which it can retain radiogenic ^87Sr, following a metamorphic event. An analysis of feldspar suggests lack of isotopic homogenization among the minerals. The results of this study do not confirm the Rb-Sr date of 850 m.y. of McClelland. No embargo |
author2 |
Faure, Gunter |
format |
Thesis |
author |
Felder, Robert Paul |
spellingShingle |
Felder, Robert Paul Isotopic and petrographic study of the Lonely Ridge Granodiorite, Nilsen Plateau, Antarctica |
author_facet |
Felder, Robert Paul |
author_sort |
Felder, Robert Paul |
title |
Isotopic and petrographic study of the Lonely Ridge Granodiorite, Nilsen Plateau, Antarctica |
title_short |
Isotopic and petrographic study of the Lonely Ridge Granodiorite, Nilsen Plateau, Antarctica |
title_full |
Isotopic and petrographic study of the Lonely Ridge Granodiorite, Nilsen Plateau, Antarctica |
title_fullStr |
Isotopic and petrographic study of the Lonely Ridge Granodiorite, Nilsen Plateau, Antarctica |
title_full_unstemmed |
Isotopic and petrographic study of the Lonely Ridge Granodiorite, Nilsen Plateau, Antarctica |
title_sort |
isotopic and petrographic study of the lonely ridge granodiorite, nilsen plateau, antarctica |
publisher |
The Ohio State University |
publishDate |
1979 |
url |
http://hdl.handle.net/1811/69251 |
long_lat |
ENVELOPE(-159.000,-159.000,-85.583,-85.583) ENVELOPE(-68.871,-68.871,-68.093,-68.093) ENVELOPE(-158.000,-158.000,-86.333,-86.333) |
geographic |
Amundsen Glacier Faure Nilsen Plateau Transantarctic Mountains |
geographic_facet |
Amundsen Glacier Faure Nilsen Plateau Transantarctic Mountains |
genre |
Amundsen Glacier Antarc* Antarctica |
genre_facet |
Amundsen Glacier Antarc* Antarctica |
op_relation |
The Ohio State University. Department of Geology and Mineralogy Senior Theses; 1979 http://hdl.handle.net/1811/69251 |
_version_ |
1766367081950871552 |