Mantle transition zone thickness beneath Ross Island, the Transantarctic Mountains, and East Antarctica
Article first published online: 18 JUN 2008
Copyright 2008 by the American Geophysical Union.
Geophysical Research Letters
Volume 35, Issue 12, June 2008
How to Cite
2008), Mantle transition zone thickness beneath Ross Island, the Transantarctic Mountains, and East Antarctica, Geophys. Res. Lett., 35, L12301, doi:10.1029/2008GL033873., , , , , , and (
- Issue published online: 18 JUN 2008
- Article first published online: 18 JUN 2008
- Manuscript Accepted: 12 MAY 2008
- Manuscript Revised: 7 MAY 2008
- Manuscript Received: 5 MAR 2008
- upper mantle
 The thickness of the mantle transition zone beneath Ross Island, and parts of the Transantarctic Mountains and East Antarctic Craton has been mapped using data from the 2000–2003 Transantarctic Mountain Seismic Experiment to determine if, as indicated by some tomographic images, an upper mantle thermal anomaly centered beneath Ross Island is a deep-seated feature extending into the mantle transition zone. Some 2700 receiver functions have been stacked using a 3D velocity model, revealing Ps conversions from the mantle transition zone discontinuities at depths of 410 and 660 km. Results yield an average nearly uniform transition zone thickness (266 ± 10 km) that is slightly larger than the global average, implying that the upper mantle thermal anomaly does not likely extend into the transition zone. This finding favors explanations for the upper mantle thermal anomaly invoking a plume head or small-scale convection.