HR: 1330h
AN: T42A-0267    [PDF]
TI: An Experimental Study of Pressure Solution of Halite Under the Confocal Microscope
AU: * Karcz, Z
EM: zvi@LDEO.columbia.edu
AF: Lamont-Doherty Earth Observatory and Department of Earth and Environmental Sciences, Columbia University, 61 Route 9W, Palisades, NY 10964 United States
AU: * Karcz, Z
EM: zvi@LDEO.columbia.edu
AF: Corporate Strategic Research, ExxonMobil Research and Engineering Company, 1545 Route 22 East, Annandale, NJ 08801 United States
AU: Aharonov, E
EM: einata@wicc.weizmann.ac.il
AF: Department of Environmental Science and Energy Research, Weizmann Institute of Science, POB 26, Rehovot, 76100 Israel
AU: Ertas, D M
EM: deniz.ertas@exxonmobil.com
AF: Corporate Strategic Research, ExxonMobil Research and Engineering Company, 1545 Route 22 East, Annandale, NJ 08801 United States
AU: Johnston, R J
EM: robert.j.johnston@exxonmobil.com
AF: Corporate Strategic Research, ExxonMobil Research and Engineering Company, 1545 Route 22 East, Annandale, NJ 08801 United States
AU: Polizzotti, R S
EM: richard.s.polizzotti@exxonmobil.com
AF: Corporate Strategic Research, ExxonMobil Research and Engineering Company, 1545 Route 22 East, Annandale, NJ 08801 United States
AU: Scholz, C H
EM: scholz@LDEO.columbia.edu
AF: Lamont-Doherty Earth Observatory and Department of Earth and Environmental Sciences, Columbia University, 61 Route 9W, Palisades, NY 10964 United States
AB: We present an experimental study of pressure solution of halite under a confocal microscope designed to resolve conflicting results in previous experiments. Two pressure solution mechanisms, thin film diffusion and undercutting, were conceptually proposed (Weyl, 1959) and later experimentally shown to operate under similar conditions (Tada \& Siever, 1986; Hickman \& Evans 1992, 1995; Schutjens \& Spiers, 1999). However, a transition between these mechanisms was never observed, and it is not clear what may induce it. Our experimental setup consists of a halite beveled indenter pressed against a flat quartz window. The contact is viewed in-situ through the window with the confocal microscope. We hypothesize that changing the angle of the bevel may change the relative magnitude of the driving forces, consequently inducing a transition in pressure solution mechanisms. The confocal microscope allows a 3D reconstruction of the microstructures at the contact.
DE: 3902 Creep and deformation
DE: 5112 Microstructure
DE: 5120 Plasticity, diffusion, and creep
DE: 8045 Role of fluids
SC: Tectonophysics [T]
MN: 2003 Fall Meeting