Analysis of the iron oxide assemblages in the ANDRILL AND-1B drill core, Ross Sea, Antarctica ...

• Main Authors: Brachfeld, Stefanie A, Pinzon, Juliana, Darley, Jason, Sagnotti, Leonardo, Kuhn, Gerhard, Florindo, Fabio, Wilson, Gary S, Ohneiser, Christian, Monien, Donata, Joseph, Leah H
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2013
• Subjects: D-ANDRILL; Antarctic Geological Drilling ANDRILL; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarc*; Antarctic; Antarctica; Ice Sheet; Ice Shelf; McMurdo Ice Shelf; Ross Sea; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.825106; https://doi.pangaea.de/10.1594/PANGAEA.825106

The AND-1B drill core recovered a 13.57 million year Miocene through Pleistocene record from beneath the McMurdo Ice Shelf in Antarctica (77.9°S, 167.1°E). Varying sedimentary facies in the 1285 m core indicate glacial-interglacial cyclicity with the proximity of ice at the site ranging from grounding of ice in 917 m of water to ice free marine conditions. Broader interpretation of climatic conditions of the wider Ross Sea Embayment is deduced from provenance studies. Here we present an analysis of the iron oxide assemblages in the AND-1B core and interpret their variability with respect to wider paleoclimatic conditions. The core is naturally divided into an upper and lower succession by an expanded 170 m thick volcanic interval between 590 and 760 m. Above 590 m the Plio-Pleistocene glacial cycles are diatom rich and below 760 m late Miocene glacial cycles are terrigenous. Electron microscopy and rock magnetic parameters confirm the subdivision with biogenic silica diluting the terrigenous input (fine ... : Supplement to: Brachfeld, Stefanie A; Pinzon, Juliana; Darley, Jason; Sagnotti, Leonardo; Kuhn, Gerhard; Florindo, Fabio; Wilson, Gary S; Ohneiser, Christian; Monien, Donata; Joseph, Leah H (2013): Iron oxide tracers of ice sheet extent and sediment provenance in the ANDRILL AND-1B drill core, Ross Sea, Antarctica. Global and Planetary Change, 110(C), 420-433 ...