نتایج جستجو برای: ordinary chondrite

تعداد نتایج: 50446  

ژورنال: فیزیک زمین و فضا 2015

Lut 009 meteorite was found during a trip to Lut Desert of Iran in March,2012, at 30°20.38' N, 59°09.04' E. Chemical compositions of equilibrated olivine (Fa19.3 ± 0.5) and orthopyroxene (Fs16.7 ± 0.6) show that the meteorite sample belongs to H group of ordinary chondrites, while the texture (chondrule petrography and plagioclase size) suggests a petrologic type of 4. The Lut 009 has been very...

Journal: :Meteoritics & Planetary Science 2022

Meteorites are prone to errestrial weathering not only after their fall on the Earth’s surface but also during storage in museum collections. To study susceptibility of this material weathering, experiments were carried out polished sections H5 chondrite Asuka 10177. The consisted four 100-days cycles which temperature and humidity varied a twelve hours basis. first alteration cycle changing fr...

Journal: :Geochimica et Cosmochimica Acta 2022

We investigated six presolar grains from very primitive regions of the matrix in unequilibrated ordinary chondrite Semarkona with transmission electron microscopy (TEM). These include one SiC, oxide (Mg-Al spinel), and four silicates. This is first TEM investigation within an host (in situ) study to report on any silicates or ex chondrite. Structural elemental compositional studies located thei...

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