31. ICE RAFTING, GLACIAL-MARINE SEDIMENTS, AND SILICEOUS OOZES: SOUTH
In the modern Southern Ocean, very little debris is delivered to the sea by icebergs. Whatever debris may be present beneath the ice sheets is lost near the grounding line. Whatever till is present beneath ice streams is also lost near the grounding line, but it may significantly contribute to fine-...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.453.8387 2023-05-15T13:38:03+02:00 31. ICE RAFTING, GLACIAL-MARINE SEDIMENTS, AND SILICEOUS OOZES: SOUTH Detlef A. Warnke Carl P. Allen The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.453.8387 http://www-odp.tamu.edu/publications/114_SR/VOLUME/CHAPTERS/sr114_31.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.453.8387 http://www-odp.tamu.edu/publications/114_SR/VOLUME/CHAPTERS/sr114_31.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www-odp.tamu.edu/publications/114_SR/VOLUME/CHAPTERS/sr114_31.pdf text ftciteseerx 2016-01-08T06:03:21Z In the modern Southern Ocean, very little debris is delivered to the sea by icebergs. Whatever debris may be present beneath the ice sheets is lost near the grounding line. Whatever till is present beneath ice streams is also lost near the grounding line, but it may significantly contribute to fine-sized suspensoids. The bulk of the ice-rafted debris encountered at Ocean Drilling Program Leg 114 drill sites was delivered in the geologic past, when antarctic glaciers had greater erosive power (Warnke, 1970). Whatever ice-rafted detritus is present is essentially only an admixture to rapidly accumulating siliceous oozes. These oozes present a paradox because, in general, primary production in the open Southern Ocean is quite low. However, because the preservation of antarctic diatoms is far better than their preservation in low latitudes, high sedimentation rates result. These relationships are explained either in terms of high flux rates during the growth season, or as the result of a "stressed ecosystem, " given to significant fluctuations, or as a combination of both mechanisms. These relationships lead to uncertainties in the computation of apparent mass-accumulation rates (AMARs) of ice-rafted detritus (details presented by Allen and Warnke, this volume). Nevertheless, a clear picture of the changes in antarctic glaciation emerges, particularly when viewed in the light of investigative results by Froelich et al. (this volume) and Hodell et al. (this volume). The most significant results of our investigations of ice-rafted detritus are the recognition of (1) the antiquity Text Antarc* Antarctic Iceberg* Southern Ocean Unknown Antarctic Southern Ocean Warnke ENVELOPE(-64.833,-64.833,-84.333,-84.333) |
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Open Polar |
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Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
In the modern Southern Ocean, very little debris is delivered to the sea by icebergs. Whatever debris may be present beneath the ice sheets is lost near the grounding line. Whatever till is present beneath ice streams is also lost near the grounding line, but it may significantly contribute to fine-sized suspensoids. The bulk of the ice-rafted debris encountered at Ocean Drilling Program Leg 114 drill sites was delivered in the geologic past, when antarctic glaciers had greater erosive power (Warnke, 1970). Whatever ice-rafted detritus is present is essentially only an admixture to rapidly accumulating siliceous oozes. These oozes present a paradox because, in general, primary production in the open Southern Ocean is quite low. However, because the preservation of antarctic diatoms is far better than their preservation in low latitudes, high sedimentation rates result. These relationships are explained either in terms of high flux rates during the growth season, or as the result of a "stressed ecosystem, " given to significant fluctuations, or as a combination of both mechanisms. These relationships lead to uncertainties in the computation of apparent mass-accumulation rates (AMARs) of ice-rafted detritus (details presented by Allen and Warnke, this volume). Nevertheless, a clear picture of the changes in antarctic glaciation emerges, particularly when viewed in the light of investigative results by Froelich et al. (this volume) and Hodell et al. (this volume). The most significant results of our investigations of ice-rafted detritus are the recognition of (1) the antiquity |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Detlef A. Warnke Carl P. Allen |
spellingShingle |
Detlef A. Warnke Carl P. Allen 31. ICE RAFTING, GLACIAL-MARINE SEDIMENTS, AND SILICEOUS OOZES: SOUTH |
author_facet |
Detlef A. Warnke Carl P. Allen |
author_sort |
Detlef A. Warnke |
title |
31. ICE RAFTING, GLACIAL-MARINE SEDIMENTS, AND SILICEOUS OOZES: SOUTH |
title_short |
31. ICE RAFTING, GLACIAL-MARINE SEDIMENTS, AND SILICEOUS OOZES: SOUTH |
title_full |
31. ICE RAFTING, GLACIAL-MARINE SEDIMENTS, AND SILICEOUS OOZES: SOUTH |
title_fullStr |
31. ICE RAFTING, GLACIAL-MARINE SEDIMENTS, AND SILICEOUS OOZES: SOUTH |
title_full_unstemmed |
31. ICE RAFTING, GLACIAL-MARINE SEDIMENTS, AND SILICEOUS OOZES: SOUTH |
title_sort |
31. ice rafting, glacial-marine sediments, and siliceous oozes: south |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.453.8387 http://www-odp.tamu.edu/publications/114_SR/VOLUME/CHAPTERS/sr114_31.pdf |
long_lat |
ENVELOPE(-64.833,-64.833,-84.333,-84.333) |
geographic |
Antarctic Southern Ocean Warnke |
geographic_facet |
Antarctic Southern Ocean Warnke |
genre |
Antarc* Antarctic Iceberg* Southern Ocean |
genre_facet |
Antarc* Antarctic Iceberg* Southern Ocean |
op_source |
http://www-odp.tamu.edu/publications/114_SR/VOLUME/CHAPTERS/sr114_31.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.453.8387 http://www-odp.tamu.edu/publications/114_SR/VOLUME/CHAPTERS/sr114_31.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766100944311812096 |