Detrital apatite and zircon (U-Th)/He evidence for early formation and slow erosion of the Gamburtsev Mountains, East Antarctica
Summary The enigmatic Gamburtsev Subglacial Mountains in East Antarctica are important as the postulated source point for Eocene glaciation, but have not been sampled directly because they are covered by 0.6-4 km of ice. Topography and ice flow suggest that they shed terrigenous sediment to the Lamb...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.539.851 2023-05-15T13:32:25+02:00 Detrital apatite and zircon (U-Th)/He evidence for early formation and slow erosion of the Gamburtsev Mountains, East Antarctica The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.851 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea193.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.851 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea193.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea193.pdf text ftciteseerx 2016-01-08T10:58:57Z Summary The enigmatic Gamburtsev Subglacial Mountains in East Antarctica are important as the postulated source point for Eocene glaciation, but have not been sampled directly because they are covered by 0.6-4 km of ice. Topography and ice flow suggest that they shed terrigenous sediment to the Lambert Graben-Prydz Bay Basin. We measured (U-Th)/He ages of 110 to 316 Ma on detrital apatite grains and 197 to 397 Ma on detrital zircon grains (of pan-African (U-Th)/Pb age) from Prydz Bay cores. Hornblende and biotite 40Ar/39Ar ages from these samples cluster around 500 Ma, representing rapid exhumation following the pan-African high grade metamorphism represented in (U-Th)/Pb ages. Combined zircon and apatite (U-Th)/He cooling models require gradual, slow cooling since about 500 Ma with erosion rates of 0.03 km/Ma or less. Models that require rapid uplift and erosion or recent formation of the Text Antarc* Antarctica East Antarctica Prydz Bay Unknown East Antarctica Gamburtsev Subglacial Mountains ENVELOPE(76.000,76.000,-80.500,-80.500) Prydz Bay |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
Summary The enigmatic Gamburtsev Subglacial Mountains in East Antarctica are important as the postulated source point for Eocene glaciation, but have not been sampled directly because they are covered by 0.6-4 km of ice. Topography and ice flow suggest that they shed terrigenous sediment to the Lambert Graben-Prydz Bay Basin. We measured (U-Th)/He ages of 110 to 316 Ma on detrital apatite grains and 197 to 397 Ma on detrital zircon grains (of pan-African (U-Th)/Pb age) from Prydz Bay cores. Hornblende and biotite 40Ar/39Ar ages from these samples cluster around 500 Ma, representing rapid exhumation following the pan-African high grade metamorphism represented in (U-Th)/Pb ages. Combined zircon and apatite (U-Th)/He cooling models require gradual, slow cooling since about 500 Ma with erosion rates of 0.03 km/Ma or less. Models that require rapid uplift and erosion or recent formation of the |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
title |
Detrital apatite and zircon (U-Th)/He evidence for early formation and slow erosion of the Gamburtsev Mountains, East Antarctica |
spellingShingle |
Detrital apatite and zircon (U-Th)/He evidence for early formation and slow erosion of the Gamburtsev Mountains, East Antarctica |
title_short |
Detrital apatite and zircon (U-Th)/He evidence for early formation and slow erosion of the Gamburtsev Mountains, East Antarctica |
title_full |
Detrital apatite and zircon (U-Th)/He evidence for early formation and slow erosion of the Gamburtsev Mountains, East Antarctica |
title_fullStr |
Detrital apatite and zircon (U-Th)/He evidence for early formation and slow erosion of the Gamburtsev Mountains, East Antarctica |
title_full_unstemmed |
Detrital apatite and zircon (U-Th)/He evidence for early formation and slow erosion of the Gamburtsev Mountains, East Antarctica |
title_sort |
detrital apatite and zircon (u-th)/he evidence for early formation and slow erosion of the gamburtsev mountains, east antarctica |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.851 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea193.pdf |
long_lat |
ENVELOPE(76.000,76.000,-80.500,-80.500) |
geographic |
East Antarctica Gamburtsev Subglacial Mountains Prydz Bay |
geographic_facet |
East Antarctica Gamburtsev Subglacial Mountains Prydz Bay |
genre |
Antarc* Antarctica East Antarctica Prydz Bay |
genre_facet |
Antarc* Antarctica East Antarctica Prydz Bay |
op_source |
http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea193.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.851 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea193.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766026868557873152 |