Distribution, preservation, and paleoecology of benthic foraminifera from McMurdo Sound, Antarctica
Ungrounding of the Ross Ice Shelf approximately 5000 years ago resulted in extreme changes in watermass characteristics and the resultant faunal assemblages of McMurdo Sound, Antarctica. What was an abundant and diverse calcareous foraminiferal assemblage in the western sound is now a diverse and ab...
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Format: | Thesis |
Language: | English |
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1988
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Online Access: | https://hdl.handle.net/20.500.11929/sdsu:28099 |
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ftsandiegostateu:oai:drupal-site.org:sdsu_28099 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
SDSUnbound (San Diego State University) |
op_collection_id |
ftsandiegostateu |
language |
English |
topic |
Anchor ice Ross Ice Shelf Scott Base McMurdo Station Explorers Cove Taylor Valley New Harbor Hut Point Peninsula Cape Armitage Mount Coleman Barnes Ridge Cape Bernacchi Bowers Piedmont Glacier Cape Royds Erebus Ice Tongue Commonwealth Stream Wales Stream |
spellingShingle |
Anchor ice Ross Ice Shelf Scott Base McMurdo Station Explorers Cove Taylor Valley New Harbor Hut Point Peninsula Cape Armitage Mount Coleman Barnes Ridge Cape Bernacchi Bowers Piedmont Glacier Cape Royds Erebus Ice Tongue Commonwealth Stream Wales Stream Distribution, preservation, and paleoecology of benthic foraminifera from McMurdo Sound, Antarctica |
topic_facet |
Anchor ice Ross Ice Shelf Scott Base McMurdo Station Explorers Cove Taylor Valley New Harbor Hut Point Peninsula Cape Armitage Mount Coleman Barnes Ridge Cape Bernacchi Bowers Piedmont Glacier Cape Royds Erebus Ice Tongue Commonwealth Stream Wales Stream |
description |
Ungrounding of the Ross Ice Shelf approximately 5000 years ago resulted in extreme changes in watermass characteristics and the resultant faunal assemblages of McMurdo Sound, Antarctica. What was an abundant and diverse calcareous foraminiferal assemblage in the western sound is now a diverse and abundant arenaceous assemblage. Waters currently bathing Explorers Cove are corrosive to CaCO3 due to the presence of supercooled waters, enriched in CO2. Enrichment in CO2 is the result of the formation of perennial ice cover reducing photosyntheses and outgassing of CO2. Development of informal zones for the Explorers Cove area was possible on the basis of diversity, percentage of calcareous vs. arenaceous specimens, total foraminiferal number and species present. Zone 1, the Cassidulinoides-Cribrostomoides assemblage-zone, represents current benthic assemblages living at or near the surface. Zone 2, the Portotrochammina-Trochammina assemblage-zone, is the altered remains of .zone 1, the result of post-mortem calcareous dissolution. Zone 3, the Lagena-Rosalina-Glandulina assemblage-zone has an increase in calcareous percentages and calcareous species of a solution prone, very delicate nature are present. Faunal variations described are the result of development of CaC03 corrosive waters, evidenced by the condition of benthic calcareous foraminiferal tests and the essentially sudden change from calcareous to arenaceous assemblages. An estimate of removal of calcareous material, on the basis of calcareous test condition and total removal of calcareous specimens at Explorers Cove is approximately 65 to 85%. Estimated sedimentation rates for the nearshore area of Explorers Cove are 3 to 4 mm/year, and 0.02 mm/year in the "starved basin" area offshore. At McMurdo, waters are only slightly corrosive to CaCO3, the result of mixing of Ice Shelf Water and High Salinity Shelf Water. Informal zones were established for this area on the basis of total foraminiferal numbers and calcareous percentages. Zone 1, the ... |
author2 |
Vaughn, Nancy R. (author) Miller, Richard H. (Advisor) Kern, Philip (Committee Member) DeLaca, Ted (Committee Member) Geological Sciences (Department) |
format |
Thesis |
title |
Distribution, preservation, and paleoecology of benthic foraminifera from McMurdo Sound, Antarctica |
title_short |
Distribution, preservation, and paleoecology of benthic foraminifera from McMurdo Sound, Antarctica |
title_full |
Distribution, preservation, and paleoecology of benthic foraminifera from McMurdo Sound, Antarctica |
title_fullStr |
Distribution, preservation, and paleoecology of benthic foraminifera from McMurdo Sound, Antarctica |
title_full_unstemmed |
Distribution, preservation, and paleoecology of benthic foraminifera from McMurdo Sound, Antarctica |
title_sort |
distribution, preservation, and paleoecology of benthic foraminifera from mcmurdo sound, antarctica |
publishDate |
1988 |
url |
https://hdl.handle.net/20.500.11929/sdsu:28099 |
op_coverage |
Antarctica -- Ross Sea -- McMurdo Sound |
long_lat |
ENVELOPE(166.667,166.667,-77.850,-77.850) ENVELOPE(163.400,163.400,-77.533,-77.533) ENVELOPE(163.000,163.000,-77.617,-77.617) ENVELOPE(164.083,164.083,-85.000,-85.000) ENVELOPE(166.766,166.766,-77.849,-77.849) ENVELOPE(166.150,166.150,-77.550,-77.550) ENVELOPE(166.150,166.150,-77.550,-77.550) ENVELOPE(166.667,166.667,-77.850,-77.850) ENVELOPE(166.850,166.850,-77.767,-77.767) ENVELOPE(166.850,166.850,-77.767,-77.767) ENVELOPE(163.583,163.583,-77.567,-77.567) ENVELOPE(163.850,163.850,-77.600,-77.600) ENVELOPE(163.250,163.250,-78.150,-78.150) ENVELOPE(163.850,163.850,-77.483,-77.483) ENVELOPE(163.500,163.500,-77.583,-77.583) ENVELOPE(166.667,166.667,-77.850,-77.850) ENVELOPE(163.450,163.450,-77.467,-77.467) ENVELOPE(164.300,164.300,-77.717,-77.717) ENVELOPE(-84.667,-84.667,-78.133,-78.133) ENVELOPE(160.617,160.617,-72.467,-72.467) ENVELOPE(163.500,163.500,-77.583,-77.583) |
geographic |
Ross Sea McMurdo Sound Ross Ice Shelf McMurdo Station Coleman Taylor Valley Bowers Scott Base Royds Cape Royds Armitage Hut Point Hut Point Peninsula Explorers Cove New Harbor Cape Armitage Bernacchi Commonwealth Stream Base McMurdo Cape Bernacchi Bowers Piedmont Glacier Barnes Ridge Mount Coleman Wales Stream |
geographic_facet |
Ross Sea McMurdo Sound Ross Ice Shelf McMurdo Station Coleman Taylor Valley Bowers Scott Base Royds Cape Royds Armitage Hut Point Hut Point Peninsula Explorers Cove New Harbor Cape Armitage Bernacchi Commonwealth Stream Base McMurdo Cape Bernacchi Bowers Piedmont Glacier Barnes Ridge Mount Coleman Wales Stream |
genre |
Antarc* Antarctica Ice Shelf McMurdo Sound Ross Ice Shelf Ross Sea |
genre_facet |
Antarc* Antarctica Ice Shelf McMurdo Sound Ross Ice Shelf Ross Sea |
op_doi |
https://doi.org/20.500.11929/sdsu:28099 |
_version_ |
1766199606449799168 |
spelling |
ftsandiegostateu:oai:drupal-site.org:sdsu_28099 2023-05-15T13:44:16+02:00 Distribution, preservation, and paleoecology of benthic foraminifera from McMurdo Sound, Antarctica Vaughn, Nancy R. (author) Miller, Richard H. (Advisor) Kern, Philip (Committee Member) DeLaca, Ted (Committee Member) Geological Sciences (Department) Antarctica -- Ross Sea -- McMurdo Sound 1988-04-27 299 pages https://hdl.handle.net/20.500.11929/sdsu:28099 en_US eng Anchor ice Ross Ice Shelf Scott Base McMurdo Station Explorers Cove Taylor Valley New Harbor Hut Point Peninsula Cape Armitage Mount Coleman Barnes Ridge Cape Bernacchi Bowers Piedmont Glacier Cape Royds Erebus Ice Tongue Commonwealth Stream Wales Stream Thesis 1988 ftsandiegostateu https://doi.org/20.500.11929/sdsu:28099 2022-03-24T18:47:29Z Ungrounding of the Ross Ice Shelf approximately 5000 years ago resulted in extreme changes in watermass characteristics and the resultant faunal assemblages of McMurdo Sound, Antarctica. What was an abundant and diverse calcareous foraminiferal assemblage in the western sound is now a diverse and abundant arenaceous assemblage. Waters currently bathing Explorers Cove are corrosive to CaCO3 due to the presence of supercooled waters, enriched in CO2. Enrichment in CO2 is the result of the formation of perennial ice cover reducing photosyntheses and outgassing of CO2. Development of informal zones for the Explorers Cove area was possible on the basis of diversity, percentage of calcareous vs. arenaceous specimens, total foraminiferal number and species present. Zone 1, the Cassidulinoides-Cribrostomoides assemblage-zone, represents current benthic assemblages living at or near the surface. Zone 2, the Portotrochammina-Trochammina assemblage-zone, is the altered remains of .zone 1, the result of post-mortem calcareous dissolution. Zone 3, the Lagena-Rosalina-Glandulina assemblage-zone has an increase in calcareous percentages and calcareous species of a solution prone, very delicate nature are present. Faunal variations described are the result of development of CaC03 corrosive waters, evidenced by the condition of benthic calcareous foraminiferal tests and the essentially sudden change from calcareous to arenaceous assemblages. An estimate of removal of calcareous material, on the basis of calcareous test condition and total removal of calcareous specimens at Explorers Cove is approximately 65 to 85%. Estimated sedimentation rates for the nearshore area of Explorers Cove are 3 to 4 mm/year, and 0.02 mm/year in the "starved basin" area offshore. At McMurdo, waters are only slightly corrosive to CaCO3, the result of mixing of Ice Shelf Water and High Salinity Shelf Water. Informal zones were established for this area on the basis of total foraminiferal numbers and calcareous percentages. Zone 1, the ... Thesis Antarc* Antarctica Ice Shelf McMurdo Sound Ross Ice Shelf Ross Sea SDSUnbound (San Diego State University) Ross Sea McMurdo Sound Ross Ice Shelf McMurdo Station ENVELOPE(166.667,166.667,-77.850,-77.850) Coleman ENVELOPE(163.400,163.400,-77.533,-77.533) Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) Bowers ENVELOPE(164.083,164.083,-85.000,-85.000) Scott Base ENVELOPE(166.766,166.766,-77.849,-77.849) Royds ENVELOPE(166.150,166.150,-77.550,-77.550) Cape Royds ENVELOPE(166.150,166.150,-77.550,-77.550) Armitage ENVELOPE(166.667,166.667,-77.850,-77.850) Hut Point ENVELOPE(166.850,166.850,-77.767,-77.767) Hut Point Peninsula ENVELOPE(166.850,166.850,-77.767,-77.767) Explorers Cove ENVELOPE(163.583,163.583,-77.567,-77.567) New Harbor ENVELOPE(163.850,163.850,-77.600,-77.600) Cape Armitage ENVELOPE(163.250,163.250,-78.150,-78.150) Bernacchi ENVELOPE(163.850,163.850,-77.483,-77.483) Commonwealth Stream ENVELOPE(163.500,163.500,-77.583,-77.583) Base McMurdo ENVELOPE(166.667,166.667,-77.850,-77.850) Cape Bernacchi ENVELOPE(163.450,163.450,-77.467,-77.467) Bowers Piedmont Glacier ENVELOPE(164.300,164.300,-77.717,-77.717) Barnes Ridge ENVELOPE(-84.667,-84.667,-78.133,-78.133) Mount Coleman ENVELOPE(160.617,160.617,-72.467,-72.467) Wales Stream ENVELOPE(163.500,163.500,-77.583,-77.583) |