Shock Propagation in Crustal Rock.
Abstract
We present shock compression and release data for Coconino Sandstone and Solenhofen and Bedford limestones. Both limestone and sandstone display three separate phases on the Hugoniot curve. For sandstone these are quartz, stishovite, and a dense liquid. The limestone Hugoniot phases are calcite I and a dense liquid, with an intervening phase of either calcite III or aragonite. For dense liquid SiO2, Po - 4.l5OMg/m3, K50 - 313.5 GPa, K' - 1.8484 and gamma - 1.4(V/V0)0.5. For dense liquid CaCO3, PC - 3.377Mg/m3, Ks0 - 139 CPa, K' - 3.4, and gamma - 2.5(V/V0). Shock-induced phase transitions in both rocks are kinetically inhibited. The fraction of the high pressure phase can be modelled by f = Ae-Ea/RT. For formation of stishovite from quartz, A = 7.286 and Ea(kJ/mol) - 89.36-71.97(po/poo), where Po and Poo are the non porous and actual initial densities of the rock. A - 6.245x10(9) and Ea - 404+0.312Poo for formation of SiO2 liquid from stishovite. A = 5.848 and Ea - 62.713-20.651Poo for formation of calcite III or aragonite from calcite I and A - 2.919 and Ea - 382.453-130.448Poo for formation of the dense liquid from either calcite III or aragonite. Sandstone retains a factor of approx. 2 more shock energy than limestone, so decoupling of explosions from seismic waves will be more efficient in sandstones.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1993
- Accession Number
- ADA288354
Entities
People
- Thomas J. Ahrens
- Willliam W. Anderson
Organizations
- California Institute of Technology