T41A:
Multidisciplinary Perspectives on the Continental Mantle Lithosphere and Lithosphere-Asthenosphere Boundary I

Submit an Abstract to this Session

Session ID#: 6846

Session Description:
In the last several decades, multi-disciplinary programs (e.g., Lithoprobe, Earthscope) have provided new insights into the structure of the continental lithosphere and the nature of the lithosphere-asthenosphere boundary (LAB). Instead of being a homongenous region of stable lithosphere, continental mantle lithosphere exhibits internal layering, lateral variations in composition and thickness, episodic destabilization, and often has a complex lower boundary. The nature of this lower boundary—the LAB—remains elusive despite numerous studies utilzing various geophysical, geochemical, and petrological techniques. Such studies have demonstrated the LAB likely consists of a boundary (or gradient) in composition, temperature, anisotropy, resistivity, hydration and/or small volumes of melt.

In this session we invite abstracts which address the structure, evolution, and dynamics of the continental lithosphere, and the nature of the LAB, dervied from a range of geophysical and geological perspectives, including seismology, geodynamic modelling, electromagnetics, geochemistry, and petrology.

OSPA Liaison:  Andrew J Schaeffer, Dublin Institute for Advanced Studies, Dublin, Ireland
Chairs:  Andrew J Schaeffer, Dublin Institute for Advanced Studies, Dublin, Ireland and Christy B. Till, Arizona State University, School of Earth & Space Exploration, Tempe, AZ, United States
Primary Convener:  Andrew J Schaeffer, Dublin Institute for Advanced Studies, Dublin, Ireland
Conveners:  Claire A Currie1, Yu Jeffrey Gu1 and Christy B. Till2, (1)University of Alberta, Department of Physics, Edmonton, AB, Canada(2)Arizona State University, School of Earth & Space Exploration, Tempe, AZ, United States
Index Terms:

7218 Lithosphere [SEISMOLOGY]
8103 Continental cratons [TECTONOPHYSICS]
8120 Dynamics of lithosphere and mantle: general [TECTONOPHYSICS]
8124 Earth's interior: composition and state [TECTONOPHYSICS]
Co-Sponsor(s):
  • S - Seismology
  • SE - Solid Earth
  • VGP - Volcanology, Geochemistry, and Petrology

Abstracts Submitted to this Session:

T41A-01
Lithosphere Temperature Constraints and the Thermal Control of Lithosphere Thickness (33935)
Roy D Hyndman, Geological Survey of Canada Sidney, Sidney, BC, Canada
T41A-02
Thermochemical Structure of the Hudson Bay Lithosphere, Northern Canada: Evidence from Multi-Observable Probabilistic Inversions (Invited) (33810)
Fiona Ann Darbyshire, University of Quebec at Montreal UQAM, Centre de recherche GEOTOP, Montreal, QC, Canada and Juan Carlos Afonso, Macquarie University, ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC, Sydney, Australia
T41A-03
Lithosphere Structure of Canada: Constraints From Ambient Seismic Noise Tomography (35197)
Claire A Currie, University of Alberta, Department of Physics, Edmonton, AB, Canada, Honn Kao, Geological Survey Canada, Sidney, BC, Canada and Roy D Hyndman, Geological Survey of Canada Sidney, Sidney, BC, Canada
T41A-04
Temporal Evolution of the Lithosphere-Asthenosphere Boundary and its Effect on the “Diamond-Window” in the Western Superior Craton (Invited) (35294)
Karen Smit1,2, Graham Pearson1, Thomas Stachel1 and Michael Seller3, (1)University of Alberta, Earth and Atmospheric Sciences, Edmonton, AB, Canada, (2)Gemological Institute of America, Carlsbad, CA, United States, (3)De Beers Canada, Toronto, ON, Canada
T41A-05
Electrical Resistivity Structure of the Proterozoic Grenville Province Lithosphere (35165)
Ademola Quadri Adetunji1, Ian J Ferguson1 and Alan G. Jones2, (1)University of Manitoba, Winnipeg, MB, Canada, (2)Dublin Institute for Advanced Studies, Geophysics Section, Dublin, Ireland
T41A-06
The role of the temperature and stress fields for evolution of asthenospheric layers (34439)
Leszek Czechowski and Marek Grad, University of Warsaw, Warsaw, Poland
T41A-07
On the History and Integrity of the Cratonic Lithosphere in Western Canada (36544)
Yu Jeffrey Gu1, Yunfeng Chen1 and Shu-Huei Hung2, (1)University of Alberta, Department of Physics, Edmonton, AB, Canada, (2)NTU National Taiwan University, Department of Geosciences, Taipei, Taiwan
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