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| Titel |
Provenance of deglacial IRD and clay minerals in the Chukchi Plateau, western Arctic Ocean |
| VerfasserIn |
K. K. Park, B. K. Khim, K. Ohkushi |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250061884
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| Zusammenfassung |
| A gravity core PC01 with a multiple core PL01 was collected from the Chukchi Plateau in the
western Arctic Ocean on the R/V Mirai Cruise MR09-03. Core PL01 was compensated for
the top-loss of core PC01, which represents a complete composite core. Age of the composite
core was estimated by correlation of geochemical properties and IRD abundance with
well-dated cores in the western Arctic Ocean, because AMS 14C dates of bulk sediments
were contaminated by old carbon. The distinct deglacial interval of the composite core was
characterized by high CaCO3 and TOC contents, high C/N ratios, and low δ13C
values, which clearly indicates the increased terrestrial contribution. Based on the
microscope and SEM observation, the major IRD constituents are composed of
carbonate minerals, supporting the high CaCO3 content at the deglacial interval.
These deglacial IRDs including carbonate minerals are possibly originated from the
Canadian Arctic Archipelago. Clay mineral data at the high IRD interval show high
kaolinite/chlorite ratios due to the increase of kaolnite that may be derived from the
northern Alaskan margin of the North America. Therefore, the deglacial interval
with high IRD abundance and increase of kaolinite/chlorite ratios indicates the
intensified Beaufort Gyre system that played an important role in the sediment delivery. |
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