Petrology, mineralogy, porosity, and cosmic-ray exposure history of Huaxi ordinary chondrite |
TEXT SIZE: A A A |
|
A meteorite fall was heard and collected on July 13, 2010 at about 18:00 (local time) in the Shibanjing village of the Huaxi district of Guiyang, Guizhou province, China. The total mass of the fall is estimated to be at least 1.6kg; some fragments are missing. The meteorite consists mainly of olivine, low-Ca pyroxene, high-Ca pyroxene, plagioclase, kamacite, taenite, and troilite. Minor phases include chromite and apatite. Various textural types of chondrules exist in this meteorite: most chondrule textures can be easily defined. The grain sizes of secondary plagioclase in this meteorite range from 2 to 50m. The chemical composition of olivine and low-Ca pyroxene are uniform; Fa in olivine and Fs in low-Ca pyroxene are, respectively, 19.6 +/- 0.2 and 17.0 +/- 0.3 (mole%). Huaxi has been classified as an H5 ordinary chondrite, with a shock grade S2, and weathering W0. The weak shock features, rare fractures, and the high porosity (17.6%) indicates that Huaxi is a less compacted meteorite. The preatmospheric radius of Huaxi is 11cm, corresponding to 21kg. The meteorite experienced a relatively short cosmic-ray exposure of about 1.6 +/- 0.1Ma. The He-4 and Ar-40 retention ages are older than 4.6Ga implying that Huaxi did not degas after thermal metamorphism on its parent body. Publication name | METEORITICS & PLANETARY SCIENCE, 52 (5):937-948; 10.1111/maps.12842 MAY 2017 | Author(s) | Li, Shijie; Wang, Shijie; Leya, Ingo; Li, Yang; Li, Xiongyao; Smith, Thomas | Corresponding author(s) | WANG Shijie wangshijie@vip.skleg.cn Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China. | View here for the details
|
|
|
|