Late Quaternary glacial－marine sedimentation in the Bransfield Strait off northeast Antarctic Peninsula

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Late Quaternary glacial-marine sedimentation in the Bransfield Strait off northeast Antarctic Peninsula

Systematical analyses of lithology,grain size, mineral composition,microbiological thanatocoenoses and other geological proxies from the sediments of piston core Pc10,drilled in the central part of the Bransfield Strait, have been carried out. Based on the above data,together with the shipboard investigation, the 753 cm long core sediments reveal the last 112.5 ha deposits of the study area under the glacial-marine environment. The sediments includes biogenic silica deposit,volcanic debris deposit and turbidity current deposit.Among them,the biogenic silica deposit is dominative not only in the highstand water/interglacial stage, but also in the lowstand water/glacial stage.The difference of sedimentation between the two stages was that the terrigenous debris content and the sedimentation rate were lower in the lowstand water/glacial stage.