Erosion of intrusive body, then uplift -- but how much? Intrusive body

Erosion of intrusive body, then uplift -- but how much?

Intrusivebody

Holocene and Pleistocene Sedimentation on the Antarctic Shelf

Why study this topic?

1) Holocene: period of dramatic S. Ocean changes w/o large CO2 change.2) Pleistocene orbital cycles: 41K, 100K, CO2 chicken and egg, Ice/Ocean

feedback.3) Estimate volumes/profiles of the ice sheet – grounding lines…..4) Pleistocene instabilities of west Antarctic ice, 400Kyr, 1100 Kyr5) Ultra-high resolution records of climate change and Antarctic Margin

productivity

CO2

variations2

Holocene and Pleistocene Sedimentation on the Antarctic Shelf

Why study this topic?

1) Holocene: period of dramatic S. Ocean changes w/o large CO2 change.2) Pleistocene orbital cycles: 41K, 100K, CO2 chicken and egg, Ice/Ocean

feedback.3) Estimate volumes/profiles of the ice sheet – grounding lines…..4) Pleistocene instabilities of west Antarctic ice, 400Kyr, 1100 Kyr5) Ultra-high resolution records of climate change and Antarctic Margin

productivity

CO2 from EPICA ice core analysis

Siegenhalter, et al., Science 310, 1313-1317, 2005

Brook (2005)

Light Purple: Altitude > 3000mRed: Slope < 1/1000Blue: Snow accumulation < 5g/cm2/yearGreen: Auroral oval below the horizonGray: Limit of visibility for geostationary satellites.

Byrd

Taylor Dome

Siple

Holocene and Pleistocene Sedimentation on the Antarctic Shelf

Why study this topic?

1) Holocene: period of dramatic S. Ocean changes w/o large CO2 change.2) Pleistocene orbital cycles: 41K, 100K, CO2 chicken and egg, Ice/Ocean

feedback.3) Estimate volumes/profiles of the ice sheet – studies of grounding lines and

how the ice actually retreats…..4) Pleistocene instabilities of west Antarctic ice, 400Kyr, 1100 Kyr5) Ultra-high resolution records of climate change and Antarctic Margin

productivity

LGM in Lambert-Amery region

Loewe Massif

Mount LanyonMawson Escarpment

Mount Ruker

Mount Lanyon

GSA Today – December, 2006

Holocene and Pleistocene Sedimentation on the Antarctic Shelf

Why study this topic?

1) Holocene: period of dramatic S. Ocean changes w/o large CO2 change.2) Pleistocene orbital cycles: 41K, 100K, CO2 chicken and egg, Ice/Ocean

feedback.3) Estimate volumes/profiles of the ice sheet – studies of grounding lines and

how the ice actually retreats…..4) Pleistocene instabilities of west Antarctic ice at 120 kyr, 400kyr, 1100 kyr5) Ultra-high resolution records of climate change and Antarctic Margin

productivity