Late Neogene climate and glacial history of the Southern Victoria Land coast from integrated drill core, seismic and outcrop data

Southern Ocean phytoplankton turnover in response to stepwise Antarctic cooling over the past 15 million years

“…2A) with the onset of pulse D. Furthermore, pulse D is preceded by MIS Gi4 and Gi2, between 3.7 and 3.6 Ma, which are characterized by δ 18 O excursions with values that are similar to the Holocene, reflect major cooling and ice sheet advance, and may also have forced the onset of turnover. Importantly, the end of pulse D coincides with the final transition from subpolar to polar conditions on the Antarctic margin and termination of earlyto mid-Pliocene warm conditions (15,29).…”

Fossil proxies of near-shore sea surface temperatures and seasonality from the late Neogene Antarctic shelf

“…Correlated using data from (Gradstein et al 2012) and benthic 18 O isotope stack LR04 (Lisiecki and Raymo 2005). Data for the Antarctic Peninsula is from Smellie et al (2006);N vlt et al (2011), Cockburn Island: (Jonkers and Kelley 1998;Pirrie et al 2011;Levy et al 2012), Vestfold Hills: (Quilty et al 1990;Quilty et al 2000;Whitehead et al 2001;Whitehead et al 2004;Whitehead et al 2006b;Cody et al 2008;Colhoun et al 2010), Larsemann Hills: (Webb 1974;Quilty et al 1990;McMinn and Harwood 1995)…”

“…These ages are stratigraphically consistent with the 40 Ar/ 39 Ar age of the underlying volcanic rocks. In contrast a biostratigraphic age based on the diatom assemblage suggested that the deposit was formed around 3 Ma (Jonkers and Kelley 1998;Pirrie et al 2011) but an updated biostratigraphy places this at 2.8 to 2.4 Ma (Cody et al 2008;Levy et al 2012). Ages based on diatom biostratigraphy can be problematic as aeolian transportation of diatoms by wind may have occurred (e.g.…”

Neogene tectonic and climatic evolution of the Western Ross Sea, Antarctica — Chronology of events from the AND-1B drill hole

“…1 and 2; Barrett et al, 1987;Wilson et al, 1998;Florindo et al, 2005) and drill holes from New Harbour had recovered Pliocene to recent valley sediments ( Fig. 1; Barrett and Hambrey, 1992;Ishman and Rieck, 2002;Levy et al, 2012;Ohneiser and Wilson, this volume;Winter et al, this volume). The AND-1B drill hole project was strategically placed to recover a history of the McMurdo/Ross Ice Shelf and the West Antarctic Ice Sheet, which is the more vulnerable component of the system (Naish et al, 2007a;Rignot et al, 2008).…”

“…Lowest and highest diatom occurrence events provide "younger than" or "older than" constraints, respectively. In this case, ages are derived from the Southern Ocean diatom event database -hybrid age model for the relevant species (Cody et al, this volume;Levy et al, 2012). Likely hiatuses in the AND-1B succession are also derived from the diatom data set where several lowest and highest occurrence events representing a range of ages occur at, or proximal to, the same stratigraphic horizon.…”