8. distribution of clay minerals in drift sediments on the ... - CiteSeerX
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8. distribution of clay minerals in drift sediments on the ... - CiteSeerX
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Barker, P.F., Camerlenghi, A., Acton, G.D., and Ramsay, A.T.S. (Eds.) Proceedings of the Ocean Drilling Program, Scientific Results Volume 178
8. DISTRIBUTION OF CLAY MINERALS IN DRIFT SEDIMENTS ON THE CONTINENTAL RISE WEST OF THE ANTARCTIC PENINSULA, ODP LEG 178, SITES 1095 AND 10961 Claus-Dieter Hillenbrand2 and Werner Ehrmann3
ABSTRACT The clay mineral compositions of upper Miocene to Quaternary sediments recovered at Ocean Drilling Program (ODP) Leg 178, Sites 1095 and 1096, from the continental rise west of the Antarctic Peninsula were analyzed in order to reconstruct the Neogene and Quaternary Antarctic paleoclimate and ice dynamics. The clay mineral assemblages are dominated by smectite, illite, and chlorite. Kaolinite occurs only in trace amounts. Analysis of a surface-sample data set facilitates the assignment of these clay minerals to particular source areas on the Antarctic Peninsula and, thus, the reconstruction of transport pathways. In the ODP cores, clay mineral composition cyclically alternates between two end-member assemblages. One assemblage is characterized by 40% chlorite. The other assemblage has >20% smectite and
