Diatom biostratigraphy of the Cenozoic glaciomarine Pagodroma Group, northern Prince Charles Mountains, East Antarctica*
In the northern Prince Charles Mountains glaciomarine sediments of the Pagodroma Group outcrop on Fisher Massif (Mt Johnston and Fisher Bench Formations) and at the Amery Oasis (Battye Glacier and Bardin Bluffs Formations), at locations 300 and 250 km south of the Amery Ice Shelf edge, respectively....
Published in: | Australian Journal of Earth Sciences |
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crwiley:10.1111/j.1400-0952.2004.01072.x 2024-09-30T14:22:21+00:00 Diatom biostratigraphy of the Cenozoic glaciomarine Pagodroma Group, northern Prince Charles Mountains, East Antarctica* WHITEHEAD, J. M. HARWOOD, D. M. McKELVEY, B. C. HAMBREY, M. J. McMINN, A. 2004 http://dx.doi.org/10.1111/j.1400-0952.2004.01072.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1400-0952.2004.01072.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1400-0952.2004.01072.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Australian Journal of Earth Sciences volume 51, issue 4, page 521-547 ISSN 0812-0099 1440-0952 journal-article 2004 crwiley https://doi.org/10.1111/j.1400-0952.2004.01072.x 2024-09-05T05:05:04Z In the northern Prince Charles Mountains glaciomarine sediments of the Pagodroma Group outcrop on Fisher Massif (Mt Johnston and Fisher Bench Formations) and at the Amery Oasis (Battye Glacier and Bardin Bluffs Formations), at locations 300 and 250 km south of the Amery Ice Shelf edge, respectively. Most of the Pagodroma Group consists of ice‐proximal glaciomarine diamict, and a much subordinate (<2%) amount of more ice‐distal mudstone. Microfossil biostratigraphy based upon in situ and glacially reworked diatoms constrains the ages of the four formations, and identifies at least six intervals of marine fjordal deposition. Sparse diatoms in Mt Johnston Formation diamicts indicate an Early Oligocene age. However, it is unclear whether these diatoms are in situ or else are glacially reworked and represent either an immediately prior or more remote past interglacial. The Battye Glacier and Fisher Bench Formations contain in situ diatoms and are broadly time equivalent, the former dating between 10.7 and 9.0 Ma and the latter between 12.1 or 10.7 Ma and 8.5 Ma. In situ diatoms indicate the Bardin Bluffs Formation to have been deposited between 2.6 and either 1.8 or 0.99 Ma. Glacially reworked diatoms in the Bardin Bluffs and Fisher Bench Formations identify four depositional intervals. The reworked taxa are sourced from Eocene–Oligocene (>30.1 Ma), Middle Miocene (14.5–12.5 Ma and 12.1–11.5 Ma), Early Pliocene (4.9–3.6 Ma) and, tentatively, Late Pliocene (3.4–2.6 Ma) strata. These microfossil data further develop the interpretation that the Pagodroma Group formed during episodes of reduced glacial extent when, in the absence of an ice shelf, marine waters penetrated far southwards into the Lambert Graben of East Antarctica. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctica Battye Glacier East Antarctica Ice Shelf Prince Charles Mountains Wiley Online Library East Antarctica Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Prince Charles Mountains ENVELOPE(67.246,67.246,-71.427,-71.427) Battye Glacier ENVELOPE(67.900,67.900,-70.867,-70.867) Bardin Bluffs ENVELOPE(68.133,68.133,-70.819,-70.819) Fisher Massif ENVELOPE(67.667,67.667,-72.317,-72.317) Australian Journal of Earth Sciences 51 4 521 547 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
In the northern Prince Charles Mountains glaciomarine sediments of the Pagodroma Group outcrop on Fisher Massif (Mt Johnston and Fisher Bench Formations) and at the Amery Oasis (Battye Glacier and Bardin Bluffs Formations), at locations 300 and 250 km south of the Amery Ice Shelf edge, respectively. Most of the Pagodroma Group consists of ice‐proximal glaciomarine diamict, and a much subordinate (<2%) amount of more ice‐distal mudstone. Microfossil biostratigraphy based upon in situ and glacially reworked diatoms constrains the ages of the four formations, and identifies at least six intervals of marine fjordal deposition. Sparse diatoms in Mt Johnston Formation diamicts indicate an Early Oligocene age. However, it is unclear whether these diatoms are in situ or else are glacially reworked and represent either an immediately prior or more remote past interglacial. The Battye Glacier and Fisher Bench Formations contain in situ diatoms and are broadly time equivalent, the former dating between 10.7 and 9.0 Ma and the latter between 12.1 or 10.7 Ma and 8.5 Ma. In situ diatoms indicate the Bardin Bluffs Formation to have been deposited between 2.6 and either 1.8 or 0.99 Ma. Glacially reworked diatoms in the Bardin Bluffs and Fisher Bench Formations identify four depositional intervals. The reworked taxa are sourced from Eocene–Oligocene (>30.1 Ma), Middle Miocene (14.5–12.5 Ma and 12.1–11.5 Ma), Early Pliocene (4.9–3.6 Ma) and, tentatively, Late Pliocene (3.4–2.6 Ma) strata. These microfossil data further develop the interpretation that the Pagodroma Group formed during episodes of reduced glacial extent when, in the absence of an ice shelf, marine waters penetrated far southwards into the Lambert Graben of East Antarctica. |
format |
Article in Journal/Newspaper |
author |
WHITEHEAD, J. M. HARWOOD, D. M. McKELVEY, B. C. HAMBREY, M. J. McMINN, A. |
spellingShingle |
WHITEHEAD, J. M. HARWOOD, D. M. McKELVEY, B. C. HAMBREY, M. J. McMINN, A. Diatom biostratigraphy of the Cenozoic glaciomarine Pagodroma Group, northern Prince Charles Mountains, East Antarctica* |
author_facet |
WHITEHEAD, J. M. HARWOOD, D. M. McKELVEY, B. C. HAMBREY, M. J. McMINN, A. |
author_sort |
WHITEHEAD, J. M. |
title |
Diatom biostratigraphy of the Cenozoic glaciomarine Pagodroma Group, northern Prince Charles Mountains, East Antarctica* |
title_short |
Diatom biostratigraphy of the Cenozoic glaciomarine Pagodroma Group, northern Prince Charles Mountains, East Antarctica* |
title_full |
Diatom biostratigraphy of the Cenozoic glaciomarine Pagodroma Group, northern Prince Charles Mountains, East Antarctica* |
title_fullStr |
Diatom biostratigraphy of the Cenozoic glaciomarine Pagodroma Group, northern Prince Charles Mountains, East Antarctica* |
title_full_unstemmed |
Diatom biostratigraphy of the Cenozoic glaciomarine Pagodroma Group, northern Prince Charles Mountains, East Antarctica* |
title_sort |
diatom biostratigraphy of the cenozoic glaciomarine pagodroma group, northern prince charles mountains, east antarctica* |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.1111/j.1400-0952.2004.01072.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1400-0952.2004.01072.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1400-0952.2004.01072.x |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) ENVELOPE(67.246,67.246,-71.427,-71.427) ENVELOPE(67.900,67.900,-70.867,-70.867) ENVELOPE(68.133,68.133,-70.819,-70.819) ENVELOPE(67.667,67.667,-72.317,-72.317) |
geographic |
East Antarctica Amery Amery Ice Shelf Prince Charles Mountains Battye Glacier Bardin Bluffs Fisher Massif |
geographic_facet |
East Antarctica Amery Amery Ice Shelf Prince Charles Mountains Battye Glacier Bardin Bluffs Fisher Massif |
genre |
Amery Ice Shelf Antarc* Antarctica Battye Glacier East Antarctica Ice Shelf Prince Charles Mountains |
genre_facet |
Amery Ice Shelf Antarc* Antarctica Battye Glacier East Antarctica Ice Shelf Prince Charles Mountains |
op_source |
Australian Journal of Earth Sciences volume 51, issue 4, page 521-547 ISSN 0812-0099 1440-0952 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1400-0952.2004.01072.x |
container_title |
Australian Journal of Earth Sciences |
container_volume |
51 |
container_issue |
4 |
container_start_page |
521 |
op_container_end_page |
547 |
_version_ |
1811633883314126848 |