Miocene Environmental Variability at the Antarctic Margin: Marine Productivity Changes Indicated by Biogenic Components in the ANDRILL Core AND‐2A, Ross Sea, Antarctica.
The content of biogenic opal, organic carbon (TOC) and inorganic carbon (TIC) in glaciomarine sediments could be an indicator for bio‐productivity and climate related signals in the sediment. Within the international Antarctic Geological Drilling Program (ANDRILL), core AND‐2A was drilled and recove...
Main Authors: | , , |
---|---|
Format: | Conference Object |
Language: | unknown |
Published: |
2011
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/25424/ https://hdl.handle.net/10013/epic.38615 |
id |
ftawi:oai:epic.awi.de:25424 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:25424 2024-09-09T19:12:07+00:00 Miocene Environmental Variability at the Antarctic Margin: Marine Productivity Changes Indicated by Biogenic Components in the ANDRILL Core AND‐2A, Ross Sea, Antarctica. Kuhn, Gerhard Hoffmann, Stefan von Eynatten, Hilmar 2011 https://epic.awi.de/id/eprint/25424/ https://hdl.handle.net/10013/epic.38615 unknown Kuhn, G. orcid:0000-0001-6069-7485 , Hoffmann, S. and von Eynatten, H. (2011) Miocene Environmental Variability at the Antarctic Margin: Marine Productivity Changes Indicated by Biogenic Components in the ANDRILL Core AND‐2A, Ross Sea, Antarctica. , 11th International Symposium of Antarctic Earth Sciences (ISAES), Edinburgh, July 2011 - unspecified . hdl:10013/epic.38615 EPIC311th International Symposium of Antarctic Earth Sciences (ISAES), Edinburgh, 2011-07 Conference notRev 2011 ftawi 2024-06-24T04:03:41Z The content of biogenic opal, organic carbon (TOC) and inorganic carbon (TIC) in glaciomarine sediments could be an indicator for bio‐productivity and climate related signals in the sediment. Within the international Antarctic Geological Drilling Program (ANDRILL), core AND‐2A was drilled and recovered a 1138 m long core of early Miocene to Pleistocene age from the McMurdo Sound in the Ross Sea. The glaciomarine sequence is dominated by changes between glacially deposited diamictites, mud‐ and sandstones with variable amount of ice rafted clasts deposited under or in front of a floating ice shelf, and open marine deposits which are found only during the Middle Miocene Climate Optimum (MMCO). Sampling about every core meter, we analysed the contents of TOC and total carbon by burning and measuring CO2 contents with infrared cells in element analysers. TIC (Calcit, Mg‐, and Fe‐carbonates) was calculated from the difference between those two values. Biogenic opal was analysed by sequential leaching in an auto‐analyser device. Biogenic opal content has a mean of 9% (weight %). Mostly, the values vary between 0% and 20%. Peak values close to 60% were detected in the core from the Middle Miocene Climate Optimum, at 310 to 311 meters below the seafloor (mbsf). TOC is generally very low in AND‐2A glaciomarine sediment and has a mean of 0.14%. During times of less glacial and more marine influence, it has peaked up to 0.3%. Only from 283 to 293 (age: 15.9 Ma), 310 to 312 mbsf (16.0 Ma) and at 434 mbsf (16.5 Ma), values are above 0.5%. This corresponds to warmer climate phases and also to higher amounts of biogenic opal in the sediments. Both components are related to productivity in the surface water and proximity to sea‐ice or ice shelf conditions. Changing preservation conditions or reworking older material may alter the signals. The pattern of TIC concentration (mean 0.9%) is different. Carbonate skeletons and shells were found throughout the core and contribute to the productivity part of the signal, the background ... Conference Object Antarc* Antarctic Antarctica Ice Shelf McMurdo Sound Ross Sea Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic The Antarctic Ross Sea McMurdo Sound |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The content of biogenic opal, organic carbon (TOC) and inorganic carbon (TIC) in glaciomarine sediments could be an indicator for bio‐productivity and climate related signals in the sediment. Within the international Antarctic Geological Drilling Program (ANDRILL), core AND‐2A was drilled and recovered a 1138 m long core of early Miocene to Pleistocene age from the McMurdo Sound in the Ross Sea. The glaciomarine sequence is dominated by changes between glacially deposited diamictites, mud‐ and sandstones with variable amount of ice rafted clasts deposited under or in front of a floating ice shelf, and open marine deposits which are found only during the Middle Miocene Climate Optimum (MMCO). Sampling about every core meter, we analysed the contents of TOC and total carbon by burning and measuring CO2 contents with infrared cells in element analysers. TIC (Calcit, Mg‐, and Fe‐carbonates) was calculated from the difference between those two values. Biogenic opal was analysed by sequential leaching in an auto‐analyser device. Biogenic opal content has a mean of 9% (weight %). Mostly, the values vary between 0% and 20%. Peak values close to 60% were detected in the core from the Middle Miocene Climate Optimum, at 310 to 311 meters below the seafloor (mbsf). TOC is generally very low in AND‐2A glaciomarine sediment and has a mean of 0.14%. During times of less glacial and more marine influence, it has peaked up to 0.3%. Only from 283 to 293 (age: 15.9 Ma), 310 to 312 mbsf (16.0 Ma) and at 434 mbsf (16.5 Ma), values are above 0.5%. This corresponds to warmer climate phases and also to higher amounts of biogenic opal in the sediments. Both components are related to productivity in the surface water and proximity to sea‐ice or ice shelf conditions. Changing preservation conditions or reworking older material may alter the signals. The pattern of TIC concentration (mean 0.9%) is different. Carbonate skeletons and shells were found throughout the core and contribute to the productivity part of the signal, the background ... |
format |
Conference Object |
author |
Kuhn, Gerhard Hoffmann, Stefan von Eynatten, Hilmar |
spellingShingle |
Kuhn, Gerhard Hoffmann, Stefan von Eynatten, Hilmar Miocene Environmental Variability at the Antarctic Margin: Marine Productivity Changes Indicated by Biogenic Components in the ANDRILL Core AND‐2A, Ross Sea, Antarctica. |
author_facet |
Kuhn, Gerhard Hoffmann, Stefan von Eynatten, Hilmar |
author_sort |
Kuhn, Gerhard |
title |
Miocene Environmental Variability at the Antarctic Margin: Marine Productivity Changes Indicated by Biogenic Components in the ANDRILL Core AND‐2A, Ross Sea, Antarctica. |
title_short |
Miocene Environmental Variability at the Antarctic Margin: Marine Productivity Changes Indicated by Biogenic Components in the ANDRILL Core AND‐2A, Ross Sea, Antarctica. |
title_full |
Miocene Environmental Variability at the Antarctic Margin: Marine Productivity Changes Indicated by Biogenic Components in the ANDRILL Core AND‐2A, Ross Sea, Antarctica. |
title_fullStr |
Miocene Environmental Variability at the Antarctic Margin: Marine Productivity Changes Indicated by Biogenic Components in the ANDRILL Core AND‐2A, Ross Sea, Antarctica. |
title_full_unstemmed |
Miocene Environmental Variability at the Antarctic Margin: Marine Productivity Changes Indicated by Biogenic Components in the ANDRILL Core AND‐2A, Ross Sea, Antarctica. |
title_sort |
miocene environmental variability at the antarctic margin: marine productivity changes indicated by biogenic components in the andrill core and‐2a, ross sea, antarctica. |
publishDate |
2011 |
url |
https://epic.awi.de/id/eprint/25424/ https://hdl.handle.net/10013/epic.38615 |
geographic |
Antarctic The Antarctic Ross Sea McMurdo Sound |
geographic_facet |
Antarctic The Antarctic Ross Sea McMurdo Sound |
genre |
Antarc* Antarctic Antarctica Ice Shelf McMurdo Sound Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf McMurdo Sound Ross Sea Sea ice |
op_source |
EPIC311th International Symposium of Antarctic Earth Sciences (ISAES), Edinburgh, 2011-07 |
op_relation |
Kuhn, G. orcid:0000-0001-6069-7485 , Hoffmann, S. and von Eynatten, H. (2011) Miocene Environmental Variability at the Antarctic Margin: Marine Productivity Changes Indicated by Biogenic Components in the ANDRILL Core AND‐2A, Ross Sea, Antarctica. , 11th International Symposium of Antarctic Earth Sciences (ISAES), Edinburgh, July 2011 - unspecified . hdl:10013/epic.38615 |
_version_ |
1809752614195167232 |