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Sierra Gorda 013
Basic information Name: Sierra Gorda 013
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2018
Country: Chile
Mass:help 804 g
Classification
  history:
Recommended:  CBa    [explanation]

This is 1 of 7 approved meteorites classified as CBa.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CB chondrites, CH-CB family, and Metal-rich meteorites
Comments: Approved 12 Apr 2019
Writeuphelp
Writeup from MB 108:

Sierra Gorda 013        22°30.96’S, 69°07.51’W

Antofagasta, Chile

Find: 2018 Oct 24

Classification: Carbonaceous chondrite (CBa)

History: 8 pieces of one meteorite were found in the the desert by Mr. T. V. Kryachko.

Physical characteristics: all samples of the meteorite have a brown fusion crust.

Petrography: M. A. Ivanova, C. A. Lorenz (Vernad) Meteorite contains two lithologies - one lithology consists of Fe,Ni-metal nodules(~80 vol%), up to 0.5 cm, and POP and BO chondrules, and their fragments up to 0.4 cm, matrix is absent; minerals are olivine, pyroxene, anorthite, Fe,Ni-metal, daubreelite, schreibersite and chromite. The second lithology consists of Fe,Ni-metal (~50 %) and silicates (~50%), with relic chondrules; many fractures filled by products of Fe,Ni oxidation are crossing the lithology. In this lithology, sulfides and schreibersite are absent. Shock stage is S2, but several fragments have stage S3-4 and contain melt pockets enclosing tiny blebbs of Fe,Ni-metal.

Geochemistry: Mineral compositions and geochemistry: M. A. Ivanova, C. A. Lorenz (Vernad) Olivine: Fa2.2±0.3 (N=53), orthopyroxene: Fs3.4±0.3Wo1.6±0.3 (N=75), clinopyroxene is represented by diopside: Fs1.9±0.4Wo45.7±0.5; plagioclase has a constant composition: An95.8±0.2Ab4.0±0.3; Fe,Ni-metal is not zoned, kamacite contains 6.90 wt% of Ni, 0.39 wt% wt% of Co; daubreelite is enriched in V (up to 2.0 wt%); chromite contains up to 15.0 wt% of Al2O3 and 18.0 Wt% of MgO . Oxygen isotopic compositions: (OU) δ17O -1.889, -1.9; δ18O 0.65, 0.59; Δ17O -2.226, -2.206 permil.

Classification: bencubbinite. Based on the texture, FeNi metal and chondrule sizes, their abundances, mineral compositions and bulk oxygen isotopic composition, the meteorite belongs to type CBa.

Specimens: a piece of the meteorite (99.3 g), 2 polished thin sections are deposited in Vernad. Mt. T. V. Kryachko (bredfild@mail.ru) holds the main mass of the meteorite.

Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:Desert
Date:2018 Oct 24
Latitude:22°30.96'S
Longitude:69°07.51'W
Mass (g):804
Pieces:8
Class:CBa
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):2.2±0.3 (N=53)
Ferrosilite (mol%):3.4±0.3 (N=75)
Wollastonite (mol%):1.6±0.3 (N=75)
Classifier:M. A. Ivanova, Vernad
Type spec mass (g):99.3
Type spec location:Vernad
Main mass:Mr. T. V. Kryachko (bredfild@mail.ru)
Finder:Mr. T. V. Kryachko (bredfild@mail.ru)
Comments:All samples belong to one meteorite and were found within 2-5 meters from each other; submitted by Marina Ivanova
Plots: O isotopes:  
Institutions
   and collections
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Timur Kryachko      
Geography:

Chile
Coordinates:
     Recommended::   (22° 30' 58"S, 69° 7' 31"W)

Statistics:
     This is 1 of 1335 approved meteorites from Antofagasta, Chile (plus 2 unapproved names) (plus 1 impact crater)
     This is 1 of 1362 approved meteorites from Chile (plus 8 unapproved names) (plus 1 impact crater)
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