Thermoluminescence of annealed and shock-loaded feldspar
Samples of oligoclase and bytownite were shock-loaded to a variety of pressures, and annealed for a variety of temperatures and times. The effect of Mrad doses of gamma-rays on oligoclase TL were also studied. After these treatments, thermoluminescence (TL) and X-ray diffraction (XRD) measurements were made to: (1) determine the effects of shock on terrestrial feldspar and compare with variations in the TL emission of ordinary chondrites (OCs); (2) determine if disordering in feldspar was responsible for any related changes in TL properties of OCs; (3) determine if the combined effect of shock plus annealing causes the changes in TL properties; (4) see if radiation damage from cosmic ray exposure plays a role in the TL variations; (5) examine the implications of this work to the thermal and shock histories of OCs. The lightly shock-loaded and annealed oligoclase samples have a dominant peak temperature of 120-140 C, identical to type 3.3-3.5 OCs. The heavily shocked samples dominant peak is at 230C, similar to type > 3.5 OCs . While the heavily annealed/disordered oligoclase samples have a peak at 280C, this peak is rarely observed in OCs. Radiation damage from Mrad doses of gamma-rays produced no change in peak temperature, but facilitated the shift to higher peak temperatures. The TL sensitivity of the shocked samples decreased by a factor of 25. Samples annealed at low temperatures (438-533C) showed a factor of 2 decrease in TL, but at the highest temperatures, the TL was a factor of 8 higher.
- Research Organization:
- Arkansas Univ., Fayetteville, AR (USA)
- OSTI ID:
- 5553820
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400600* -- Radiation Chemistry
ANNEALING
CHONDRITES
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
DIFFRACTION
ELECTROMAGNETIC RADIATION
FELDSPARS
GAMMA RADIATION
HEAT TREATMENTS
IONIZING RADIATIONS
IRRADIATION
LUMINESCENCE
METEORITES
MICROSTRUCTURE
MINERALS
PRESSURIZING
RADIATION EFFECTS
RADIATIONS
SCATTERING
STONE METEORITES
TEMPERATURE DEPENDENCE
THERMOLUMINESCENCE
TIME DEPENDENCE
X-RAY DIFFRACTION