Ice Induced Sea Level Change in the Late Neogene
Two independent records of latest Neogene (2,0 - 6.0 Ma.) glacioeustasy are presented, one of Antarctic ice volume from East Antarctica and the other of eustatic sea level from the South Wanganui Basin, New Zealand. Glacial deposits in the Transantarctic Mountains (Sirius Group) and sediment at the...
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ftvictoriauwfig:oai:figshare.com:article/16959088 2023-05-15T13:35:14+02:00 Ice Induced Sea Level Change in the Late Neogene Wilson, Gary Steven 1993-01-01T00:00:00Z https://doi.org/10.26686/wgtn.16959088.v1 https://figshare.com/articles/thesis/Ice_Induced_Sea_Level_Change_in_the_Late_Neogene/16959088 unknown doi:10.26686/wgtn.16959088.v1 https://figshare.com/articles/thesis/Ice_Induced_Sea_Level_Change_in_the_Late_Neogene/16959088 Author Retains Copyright Earth Sciences not elsewhere classified New Zealand Neogene period Ice sheets Antarctica Glaciology Stratigraphic geology School: School of Geography Environment and Earth Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260115 Glaciology Marsden: 260111 Other Stratigraphy (incl. Sequence Stratigraphy) Degree Discipline: Geology Degree Level: Doctoral Degree Name: Doctor of Philosophy Text Thesis 1993 ftvictoriauwfig https://doi.org/10.26686/wgtn.16959088.v1 2021-11-11T00:04:18Z Two independent records of latest Neogene (2,0 - 6.0 Ma.) glacioeustasy are presented, one of Antarctic ice volume from East Antarctica and the other of eustatic sea level from the South Wanganui Basin, New Zealand. Glacial deposits in the Transantarctic Mountains (Sirius Group) and sediment at the Antarctic continental margin provide direct evidence of Antarctic ice sheet fluctuation. Evidence for deglaciation includes the occurrence of Pliocene marine diatoms in Sirius Group deposits, which are sourced from the East Antarctic interior. K/Ar and 39Ar/40Ar dating of a tuff in the CIROS-2 drill-core confirms their Pliocene age at high latitudes (78 [degrees] S) in Antarctica. Further evidence for Antarctic ice volume fluctuation is recorded by glaciomarine strata from the Ross Sea Sector cored by the CIROS-2 and DVDP-11 drill-holes. Magnetostratigraphy integrated with Beryllium-10, K/Ar and 39Ar/40Ar dating provides a high resolution ([plus or minus] 50 k.y.) chronology of events in these strata. In the Wanganui Basin, New Zealand, a 5 km thick succession of continental shelf sediments, now uplifted, records Late Neogene eustatic sea level fluctuation. In the Late Neogene, basin subsidence equalled sediment input allowing eustatic sea level fluctuation to produce a dynamic alternation of highstand, transgressive, and lowstand sediment wedges. This record of Late Neogene sea level variation is unequalled in its resolution and detail. Magnetostratigraphy provides a high resolution chronology for these sedimentary cycles as well as magnetic tie lines with the Antarctic margin record in McMurdo Sound. These two independent records of Late Neogene glacioeustasy are in good agreement and record the following history: The Late Miocene and Late Pliocene are times of low 'base level' glacioeustasy (here termed glacialism, rather than glacial), with growth of continental-scale ice sheets on the Antarctic continent causing a lowering of global sea level. The Early Pliocene was a time of high 'base level' glacioeustasy (here ... Thesis Antarc* Antarctic Antarctica East Antarctica Ice Sheet McMurdo Sound Ross Sea Open Access Victoria University of Wellington / Te Herenga Waka Antarctic East Antarctica Marsden ENVELOPE(66.067,66.067,-67.867,-67.867) McMurdo Sound New Zealand Ross Sea Sirius ENVELOPE(163.250,163.250,-84.133,-84.133) The Antarctic Transantarctic Mountains |
institution |
Open Polar |
collection |
Open Access Victoria University of Wellington / Te Herenga Waka |
op_collection_id |
ftvictoriauwfig |
language |
unknown |
topic |
Earth Sciences not elsewhere classified New Zealand Neogene period Ice sheets Antarctica Glaciology Stratigraphic geology School: School of Geography Environment and Earth Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260115 Glaciology Marsden: 260111 Other Stratigraphy (incl. Sequence Stratigraphy) Degree Discipline: Geology Degree Level: Doctoral Degree Name: Doctor of Philosophy |
spellingShingle |
Earth Sciences not elsewhere classified New Zealand Neogene period Ice sheets Antarctica Glaciology Stratigraphic geology School: School of Geography Environment and Earth Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260115 Glaciology Marsden: 260111 Other Stratigraphy (incl. Sequence Stratigraphy) Degree Discipline: Geology Degree Level: Doctoral Degree Name: Doctor of Philosophy Wilson, Gary Steven Ice Induced Sea Level Change in the Late Neogene |
topic_facet |
Earth Sciences not elsewhere classified New Zealand Neogene period Ice sheets Antarctica Glaciology Stratigraphic geology School: School of Geography Environment and Earth Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260115 Glaciology Marsden: 260111 Other Stratigraphy (incl. Sequence Stratigraphy) Degree Discipline: Geology Degree Level: Doctoral Degree Name: Doctor of Philosophy |
description |
Two independent records of latest Neogene (2,0 - 6.0 Ma.) glacioeustasy are presented, one of Antarctic ice volume from East Antarctica and the other of eustatic sea level from the South Wanganui Basin, New Zealand. Glacial deposits in the Transantarctic Mountains (Sirius Group) and sediment at the Antarctic continental margin provide direct evidence of Antarctic ice sheet fluctuation. Evidence for deglaciation includes the occurrence of Pliocene marine diatoms in Sirius Group deposits, which are sourced from the East Antarctic interior. K/Ar and 39Ar/40Ar dating of a tuff in the CIROS-2 drill-core confirms their Pliocene age at high latitudes (78 [degrees] S) in Antarctica. Further evidence for Antarctic ice volume fluctuation is recorded by glaciomarine strata from the Ross Sea Sector cored by the CIROS-2 and DVDP-11 drill-holes. Magnetostratigraphy integrated with Beryllium-10, K/Ar and 39Ar/40Ar dating provides a high resolution ([plus or minus] 50 k.y.) chronology of events in these strata. In the Wanganui Basin, New Zealand, a 5 km thick succession of continental shelf sediments, now uplifted, records Late Neogene eustatic sea level fluctuation. In the Late Neogene, basin subsidence equalled sediment input allowing eustatic sea level fluctuation to produce a dynamic alternation of highstand, transgressive, and lowstand sediment wedges. This record of Late Neogene sea level variation is unequalled in its resolution and detail. Magnetostratigraphy provides a high resolution chronology for these sedimentary cycles as well as magnetic tie lines with the Antarctic margin record in McMurdo Sound. These two independent records of Late Neogene glacioeustasy are in good agreement and record the following history: The Late Miocene and Late Pliocene are times of low 'base level' glacioeustasy (here termed glacialism, rather than glacial), with growth of continental-scale ice sheets on the Antarctic continent causing a lowering of global sea level. The Early Pliocene was a time of high 'base level' glacioeustasy (here ... |
format |
Thesis |
author |
Wilson, Gary Steven |
author_facet |
Wilson, Gary Steven |
author_sort |
Wilson, Gary Steven |
title |
Ice Induced Sea Level Change in the Late Neogene |
title_short |
Ice Induced Sea Level Change in the Late Neogene |
title_full |
Ice Induced Sea Level Change in the Late Neogene |
title_fullStr |
Ice Induced Sea Level Change in the Late Neogene |
title_full_unstemmed |
Ice Induced Sea Level Change in the Late Neogene |
title_sort |
ice induced sea level change in the late neogene |
publishDate |
1993 |
url |
https://doi.org/10.26686/wgtn.16959088.v1 https://figshare.com/articles/thesis/Ice_Induced_Sea_Level_Change_in_the_Late_Neogene/16959088 |
long_lat |
ENVELOPE(66.067,66.067,-67.867,-67.867) ENVELOPE(163.250,163.250,-84.133,-84.133) |
geographic |
Antarctic East Antarctica Marsden McMurdo Sound New Zealand Ross Sea Sirius The Antarctic Transantarctic Mountains |
geographic_facet |
Antarctic East Antarctica Marsden McMurdo Sound New Zealand Ross Sea Sirius The Antarctic Transantarctic Mountains |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet McMurdo Sound Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet McMurdo Sound Ross Sea |
op_relation |
doi:10.26686/wgtn.16959088.v1 https://figshare.com/articles/thesis/Ice_Induced_Sea_Level_Change_in_the_Late_Neogene/16959088 |
op_rights |
Author Retains Copyright |
op_doi |
https://doi.org/10.26686/wgtn.16959088.v1 |
_version_ |
1766063148205342720 |