HR: 1340h
AN: V53C-1580    [Abstracts]
TI: An Experimental Cell for High-Temperature
AU: Giordano, D
EM: dgiordano@eos.ubc.ca
AF: Volcanology & Petrology Laboratory, Earth & Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4 Canada
AU: * Robert, G
EM: grobert@eos.ubc.ca
AF: Volcanology & Petrology Laboratory, Earth & Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4 Canada
AU: Rodway, R
EM: rrodway@eos.ubc.ca
AF: Volcanology & Petrology Laboratory, Earth & Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4 Canada
AU: Rust, A
EM: arust@eos.ubc.ca
AF: Volcanology & Petrology Laboratory, Earth & Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4 Canada
AU: Russell, J K
EM: krussell@eos.ubc.ca
AF: Volcanology & Petrology Laboratory, Earth & Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4 Canada
AB: The Volcanology-Deformation-Rig (VDR) was developed for exploring the high-T rheological properties of volcanic materials [1]. The VDR is designed to perform high-T, low-load (< 1136 kg) deformation experiments at constant load, or displacement rate, or at controlled load rates. The rig is ideal for determining the rheological response of volcanic products within a wide range of natural conditions: T up to 1000^oC, applied stresses up to 150 MPa, and strain rates between 10^-6 and 10^-2 s^-1. The resulting data provide a powerful means of developing constitutive equations governing the multiphase (liquids ± vesicles ± solids) rheology of volcanic material during flow and deformation [2]. Many seminal issues in volcanology involve the behaviour of the volatile phase during flow and deformation and its effect on magma rheology and volcanic behaviour. Thus, we have designed and built a high-T resistant, sealed fluid pressure cell. The cell gives us the capacity to run controlled high-T deformation experiments at controlled H₂O pressures that simulate nature (0-150 MPa). Deformation experiments can be run on consolidated and unconsolidated samples up to 3 cm in diameter and 10 cm in length. Fluid pressure in the cell can either be a dependent or independent variable. The former corresponds to a closed-system where fluid pressure is monitored throughout the experiment, whereas the latter is an open-system experiment with a fixed fluid pressure. By means of varying temperature and strain rate our experiments can explore the viscous to brittle transition of the investigated volcanic products at controlled conditions (e.g., water-bearing and/or water pressurized systems). We plan to use high-T experiments on natural volcanic materials (e.g., cores of sintered ash, obsidian, or pumice) to elucidate the rheology of multiphase volcanic products and to study feedback mechanisms between porosity and permeability evolution. References Cited: [1] Quane S, Russell JK & Kennedy LA 2004. Am Min (Lets) 89, 873-877. [2] Quane S & Russell JK 2005. J Volc & Geoth Res 142, 67-87.
DE: 8429 Lava rheology and morphology
DE: 8445 Experimental volcanism
DE: 8494 Instruments and techniques
SC: Volcanology, Geochemistry, Petrology [V]
MN: Fall Meeting 2005