Thermoluminescence of shocked chondrites and regolith breccias

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5553794

Haq, M U

The distribution of TL sensitivities for non-Antarctic L chondrites differs from that of non-Antarctic H chondrites, consistent with a greater proportion of the former class suffering post metamorphic shock. Data from TL annealing experiments and {sup 40}Ar step-wise release measurements enables the meteorites to be sorted into three post-shock temperature groups (<800 C, 800-1000C,> 1000C). The TL sensitivities of Antarctic H chondrites are typically 1/3 those of non-Antarctic H chondrites. On TL peak temperature-peak width diagram, L chondrites produce tight clusters with only partial overlap between those of Antarctic and non-Antarctic L chondrites. H chondrites from Antarctic also from tight clusters but non-Antarctic H chondrites plot in a band of increasing peak temperature and width, with no overlap between the data for Antarctic and non-Antarctic meteorites. On TL peak temperature-peak width plots for meteorites with greater regolith maturity the clast and matrix form two separate clusters, while meteorites with lower regolith maturity showed no difference in their matrix and clast data. The data are consistent with the dark matrix being comminuted clast material contaminated with another component. The Cumberland Falls inclusions produced glow curves with similar shapes to those of type 3 ordinary chondrites and very different to those of the host samples. TL sensitivities for the inclusions were in the range of type 3.4-3.6 ordinary chondrites. The TL data are consistent with the inclusions are metamorphic series of primitive ordinary chondrites. The inclusions have not been heated in excess of 800C for 100 hours since the formation of feldspar.

• Research Organization: Arkansas Univ., Fayetteville, AR (USA)
• OSTI ID: 5553794
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
58 GEOSCIENCES
580100 -- Geology &amp; Hydrology-- (-1989)
ANNEALING
ANTARCTIC REGIONS
ANTARCTICA
ARGON 40
ARGON ISOTOPES
COMPARATIVE EVALUATIONS
CONGLOMERATES
CRYSTAL STRUCTURE
EVEN-EVEN NUCLEI
FELDSPARS
HEAT TREATMENTS
INCLUSIONS
ISOTOPES
LIGHT NUCLEI
LUMINESCENCE
METAMORPHISM
METEORITES
MICROSTRUCTURE
MINERALS
NUCLEI
POLAR REGIONS
ROCKS
SEDIMENTARY ROCKS
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
THERMOLUMINESCENCE