Chemical and physical studies of type 3 chondrites. VII - Annealing studies of the Dhajala H3.8 chondrite and the thermal history of chondrules and chondrites

Details Chemical and physical studies of type 3 chondrites. VII - Annealing studies of the Dhajala H3.8 chondrite and the thermal history of chondrules and chondrites Chemical and physical studies of type 3 chondrites. VII - Annealing studies of the Dhajala H3.8 chondrite and the thermal history of chondrules and chondrites

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..77..419k&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 77, no. 3-4, April 1986, p. 419-427.

Mathematics

Logic

5

Annealing, Chondrites, Chondrule, Meteoritic Composition, Petrology, Thermoluminescence, Crystallization, Feldspars, Time Dependence, Meteorites, Chemistry, Physical Properties, Stony Meteorites, Annealing, Dhajala, H3 Chondrites, Thermal Properties, History, Crystallization, Chondrules, Samples, Meteorite, Procedure, Thermoluminescence, Source, Thermal Effects, Properties, Feldspar, Mesostasis, Diffusion, Heating, Equilibration, Cooling, Petrology, Formation, Parent Bodies, Hypotheses

Scientific paper

Samples of the Dhajala meteorite were annealed at 600-1000 C for 1, 2, 10, 20 and 100 h and their thermoluminescence (TL) properties were measured. After annealing at less than 900 deg, the TL sensitivity decreased by a factor of two; at higher temperatures, it fell by an order of magnitude. Data indicate that the annealing treatment caused the low-temperature feldspar in Dhajala to be converted to feldspar of a high-temperature (disordered) form. Low-temperature feldspar was found in the meteorite's TL-sensitive chondrules which comprised about 20 percent of those separated. It is suggested that these chondrules suffered greater crystallization of their mesostasis than the other chondrules, and equilibrated to lower temperatures. Based on TL data, there appears to be no relationship between post-metamorphic cooling rate and petrologic type for the 3.5-3.9 chondrites.

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