Lohawat howardite: Mineralogy, chemistry and cosmogenic effects

Details Lohawat howardite: Mineralogy, chemistry and cosmogenic effects Lohawat howardite: Mineralogy, chemistry and cosmogenic effects

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001m%26ps...36.1457s&link_type=abstract

Meteoritics & Planetary Science, vol. 36, no. 11, pp. 1457-1466 (2001)

Computer Science

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Scientific paper

Lohawat meteorite is a texturally heterogeneous breccia having a variety of mineral and lithic fragments. Amongst mineral fragments, pyroxenes show a wide range of composition (Wo.011-0.17En.37-.78Fs.21-.60) whereas plagioclase is anorthitic (An.92Ab.07Or.007). Abundant rounded "chondrule-like" objects ranging in size up to about 7 mm, some with concentric layering have been observed. Petrographic features, trace element composition and REE patterns show presence of eucritic and diogenitic components confirming that it is a typical howardite. Cosmogenic tracks, rare gases (He, Ne, and Ar) and radionuclides (22Na and 26Al) were measured. Track density in olivine and plagioclase varies between 0.7 to 6(106/cm2. 38Ar exposure age is estimated to be ~ 110 Ma, being the highest amongst howardites. The track production rates correspond to ablation of 9 to 15 cm, implying a radius of ~27 cm for its preatmospheric size. 22Na /26Al ~ 1, as expected from the production models and solar modulation of galactic cosmic ray fluxes before its fall, suggesting that the meteoroid did not undergo any fragmentation during the past ~2 Ma in the interplanetary space. The radiogenic age based on K-Ar method is 4.3 Ga while U-Th-4He age is 3.3 Ga indicating partial loss of He.

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