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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:help 376 g
Classification
  history:
Recommended:  L5    [explanation]

This is 1 of 7220 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
Writeuphelp
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:
State/Prov/County:Antofagasta
Origin or pseudonym:limestone deflation plain
Date:2017 Oct 18
Latitude:22°30.393'S
Longitude:69º02.233'W
Mass (g):375.66
Pieces:1
Class:L5
Shock stage:S3/4
Weathering grade:W2
Fayalite (mol%):26.6±0.3 (N=13)
Ferrosilite (mol%):22.0±0.7 (N=12)
Wollastonite (mol%):1.5±0.3 (N=12)
Classifier:K. Dugushkina and S. Berzin, RAS-UB
Type spec mass (g):375.66
Type spec location:UrFU
Main mass:UrFU
Finder:UrFU meteorite expedition - Chile-2017
Comments:Field name Past-8; submitted by Kseniya Dugushkina (UB RAS) dugushkina.kseniya@mail.ru
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)
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Geography:

Chile
Coordinates:
     Recommended::   (22° 30' 24"S, 69° 2' 14"W)

Statistics:
     This is 1 of 2081 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater)
     This is 1 of 2109 approved meteorites from Chile (plus 12 unapproved names) (plus 1 impact crater)
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