| MetSoc Home Publications Contacts |
|
||
|
||
| Sierra Gorda 030 | |||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic information | Name: Sierra Gorda 030 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2017 Country: Chile Mass:  376 g | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 8831 approved meteorites (plus 4 unapproved names) classified as L5. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||||||||||
| Comments: | Approved 23 Feb 2020 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 109:
Sierra Gorda 030 22°30.393’S, 69º02.233’W Antofagasta, Chile Find: 2017 Oct 18 Classification: Ordinary chondrite (L5) History: One fragment (375.66 g) was found 18 October 2017 by the UrFU meteorite expedition-2017 in Chile (Pastukhovich A.Yu., Larionov M.Yu., Kruglikov N.A., Kolunin R.N.) near Calama. Petrography: Classification (K. Dugushkina and S. Berzin, RAS-UB). The meteorite consists mostly of a fine-grained, inequigranular, recrystallized matrix and chondrules (20%). Chondrite consists of olivine 70%, orthopyroxene 15%, clinopyroxene 5-7%, plagioclase 5-7%, chromite 1-2%, troilite 3-4%, Fe-Ni-metal 1-3%, with accessory apatite. Predominantly porphyritic olivine (PO) and porphyritic olivine-pyroxene (POP) chondrules. Chondrules have vague boundaries. There is a grid of thin, metal-troilite shock veins in fractures in olivine, pyroxene and plagioclase. Plagioclase is not melted. Shock stage is S3-4. Moderate oxidation of metal, about 20-60% being affected, alteration of mafic silicates is beginning. Metal and troilite are almost completely oxidized in the grid of thin shock veins. Weathering grade is W2. Geochemistry: EDX analyses by K. Dugushkina, RAS-UB. Clinopyroxene En45Fs12Wo43±1 (N=7), plagioclase An20±0.7 (N=17), chromite, apatite, troilite, kamacite (Ni 5.7-6.8 wt%), taenite (Ni 28.17-35.2 wt%). The average composition of chromite (N=6): Cr2O3 55.7±0.4%, TiO2 2.9±0.3%, Al2O3 5.8±0.2%, FeO 32.3±0.6%, MgO 2.5±04%, MnO 0.4±0.3%, SiO2 0.4±0.2. Classification: (K. Dugushkina, RAS-UB) L5, ordinary chondrite. Specimens: 361.96 g in 2 samples, plus 13.7 g cut-off and thin section, UrFU | ||||||||||||||||||||||||||||||||||||||
| Data from: MB109 Table 0 Line 0: |
|
||||||||||||||||||||||||||||||||||||||
| Institutions and collections |
UrFU: Ural Federal University, 620002, 19 Mira street, Ekaterinburg, Russia (institutional address; updated 14 Jan 2015) RAS-UB: Zavaritsky Institute of Geology and Geochemistry Russian Academy of Sciences, Ural Branch 15 Akademika Vonsovskogo str., Ekaterinburg, 620016, Russia (institutional address; updated 19 Apr 2018) |
||||||||||||||||||||||||||||||||||||||
| Catalogs: |
| ||||||||||||||||||||||||||||||||||||||
| References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
| ||||||||||||||||||||||||||||||||||||||
Geography:
|
Statistics: This is 1 of 3160 approved meteorites from Antofagasta, Chile (plus 11 unapproved names) (plus 1 impact crater) This is 1 of 3189 approved meteorites from Chile (plus 14 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||||||||
| Proximity search: | |||||||||||||||||||||||||||||||||||||||