Dear all,
Just a reminder that the abstract deadline for AGU submissions is rapidly approaching (midnight, 7th Spetember, GMT), and to encourgae you to submit an abstract for a session on the orientation and spatial distribution of geological structures in 3D.
This will cover domains from the millimetre to the kilometre in scale. A better understanding of the relationship between the orientation of slip surfaces and all three principal strain (or stress) axes will help us to interpret geological material deformed under non-plane strain (stress) conditions. In this session we are therefore particularly keen to attract contributions from workers that are able to give new insight on the inadequacy of considering deformation in 2D.
Further details on the session can be found below, and at http://www.agu.org/meetings/fm06.
Please do not hesitate to contact any ot the conveners for further details
David Healy ([log in to unmask])
Sergio Llana-Funez ([log in to unmask])
Richard Jones ([log in to unmask])
T10: Controls on the Three Dimensional Orientation of Brittle and Plastic Slip Surfaces: Integrating Theory With Field and Laboratory Measurements
The three-dimensional (3D) orientation of individual slip planes and slip directions, and their emergent patterns, has important implications for earthquake seismology, rock mass stability, and fluid flow in fractured rocks because these structures exert a fundamental control on the evolution of bulk properties such as permeability and the elastic moduli. This session will attempt to link our theoretical understanding (mechanics) with measurements of slip surface orientations from the lab and the field. Historically, both the theoretical analysis and the practical measurement of localisation structures in rocks has been simplified to a 2D situation, either involving a plane strain condition or with no clear role for the intermediate stress. The general deformation within the lithosphere, whether brittle or plastic, will involve non-plane 3D strain to a significant degree. Recent work by the conveners and the invited speakers highlights the need for 3D kinematic and/or dynamic models of natural deformation. We will consider contributions describing brittle and/or plastic deformation with any combination of field or laboratory (experimental) observations, theory and numerical modelling. We attach equal importance to the 3D orientation of newly formed slip surfaces as to reactivated pre-existing structures. Localised slip systems of interest include, but are not limited to: shear fractures, faults, deformation bands, dislocation glide (creep) planes, shear zones, shear bands, crenulation cleavage and grain boundaries.
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