The Kumtag 016 L5 strewn field, Xinjiang Province, China

Zeng, Xiaojia; Li, Shijie; Leya, Ingo; Wang, Shijie; Smith, Thomas; Li, Yang; Wang, Peng (2018). The Kumtag 016 L5 strewn field, Xinjiang Province, China. Meteoritics & planetary science, 53(6), pp. 1113-1130. Meteoritical Society at the University of Arkansas, Dept. of Chemistry and Biochemistry 10.1111/maps.13073

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The Kumtag 016 strewn field was found in the eastern part of the Kumtag desert,
Xinjiang Province, China. In this study, 24 recovered meteorites have been ch aracterized by a suite of different analytical techniques to investigate their petrography, mineralogy, bulk trace elements, noble gas isotopic composition, density, and porosity. We attribute to the strewn field 22 L5 chondrites with shock stage S4 and weathering grade W2–W3. Two
differen t meteorites, Kumtag 021, an L4 chondrite and Kumt ag 032, an L6 chondrite, were recognized within the strewn field area. Moreover, Kumt ag 003, an H5 chondrite, was previously found in the same area. We infer that the Kumtag 016 strewn field most likely consists of at least four distinct meteorite falls. The effects of terrestrial weathering on the studied mete orites involve sulfide/metal alteration, chemical changes (Sr, Ba, Pb, and U enrichments and depletion in Cr, Co, Ni, and Cs abun dances), and physical modifications (decrease of grain density and porosity). Measurements of the light noble gases indicate that the analyzed Kumtag L5 samples contain solar wind-implanted noble gases with a ²⁰ Ne/²² Ne ratio of ~12.345. The cosmic-ray exposure (CRE) ages of the L5 ch ondrites are in a narrow range (3.6 ± 1.4 Ma to 5.2 ± 0.4 Ma). For L4 cho ndrite Kumtag 021 and L6 chondrite Kumtag 032, the CRE ages are 5.9 ± 0.4 Ma and 4.7 ± 0.8 Ma, respectively.

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