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Clay minerals in response to the Pleistocene climate change on the Yermak Plateau, Arctic Ocean (ODP, Site 911)

Published online by Cambridge University Press:  27 October 2009

Mattiina Ruikka  and
Kari Strand
Mattiina Ruikka
Affiliation:
Department of Geology, Linnanmaa, PO Box 3000, FIN-90014 University of Oulu, Finland and Thule Institute, Linnanmaa, PO Box 7300, FIN-90014 University of Oulu, Finland
Kari Strand
Affiliation:
Thule Institute, Linnanmaa, PO Box 7300, FIN-90014 University of Oulu, Finland
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Abstract

The Arctic plays an important role in controlling the Earth's climate and ocean circulation. Studies of past climate conditions in high latitudes are important to understand this role more precisely. Clay mineralogy of sediments was detected to be comparative with cyclic changes in climatic conditions during the past 0.8 Ma in the northernmost Atlantic-Arctic gateway (Ocean Drilling Program, Site 911). Clay minerals are transported by sea ice, icebergs, glaciofluvially, or by ocean currents. Smectite is assumed to be transported predominantly during interglacial periods. Its content decreases from about 0.4 Ma to the present, which may indicate lesser eroded smectite in the provenance area, assumed to be mostly in the Laptev Sea. Illite is due to erosion from Svalbard during glacial periods, and shows a negative correlation with smectite. Chlorite is not a good climate indicator because of its high frequency in the northern regions. Zemlya Frantsa-Iosifa (Franz Josef Land) is the most likely source area of kaolinite and the output seems to have slightly increased from 0.5 to 0.4 Ma. The correlation of kaolinite and chlorite means coincidental sedimentation. Kaolinite and chlorite are negatively correlated with illite, which indicates transportation during the more open ocean conditions that prevailed between repeated Pleistocene glaciations.

Type
Articles
Information
Polar Record , Volume 38 , Issue 206 , July 2002 , pp. 241 - 248
Copyright
Copyright © Cambridge University Press 2002

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