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Sierra Gorda 009
Basic information Name: Sierra Gorda 009
     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 240 g
Classification
  history:
Recommended:  Chondrite-ung    [explanation]

This is 1 of 24 approved meteorites classified as Chondrite-ung.   [show all]
Search for other: Ungrouped chondrites
Comments: Approved 11 Dec 2018
Writeuphelp
Writeup from MB 107:

Sierra Gorda 009        22°30.10’S, 69°08.20’W

Antofagasta, Chile

Find: 2017 Oct 21

Classification: Ungrouped chondrite

History: Three pieces (30 g, 70 g, and 140 g) of one meteorite were found in the the desert by Mr. T. V. Kryachko, Mr. M. E. Nepomiluev, and an anonymous finder.

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

Petrography: M. A. Ivanova (Vernad) Meteorite has chondritic texture and consists of FeNi-metal (22 -25 vol%), chondrules, and their fragments; matrix is absent. Chondrules, up to 2 mm, are PP, BO, POP, SiO2-bearing and Al-rich with clear bounaries; PP chondrules are dominant; the main minerals are pyroxene, Fe,Ni-metal, olivine and sulfides (troilite and daubreelite), schreibersite; accessory minerals are silica, Mg-chromite, anorthite, spinel, graphite and PGE-metal nuggets.

Geochemistry: Mineral compositions and geochemistry: M. A. Ivanova (Vernad), V. V. Kozlov (Oxford Instruments OM & Gatan Inc., Moscow Office) Olivine: Fa0.47±0.10 (N=74), orthopyroxene: Fs1.42±0.39Wo0.88±0.63 (N=42), (N=42), FeO-rich Opx: Fs9.33-32.48Wo0.23-4.74; diopside: Fs1.34±0.57Wo47.32±2.31; plagioclase varies in composition: An 32.28-95.04Ab4.96-65.99; mesostasis in chondrules is enriched in K2O (up to 9.18 wt%) and TiO2 (up to 6.53 wt%); kamacite contains 5.07 wt% Ni, 0.43 wt% Co, Co/Ni - 0.09, Si and Cr are below detection (<0.03 wt%); taenite: Ni -32.3 wt%, Co - 0.25 wt% ; troilite is enriched in Cr (up to 2.4 wt%); MgO-chromite is almost pure MgO-end member. Oxygen isotopic compositions: (OU) δ17O 3.763, 3.736; δ18O 6.263, 6.169; Δ17O 0.506, 0.528 permil.

Classification: ungrouped Fe,Ni-metal-rich chondrite with affinities to "G-chondrites" (GRO 95551 and NWA 5492, Weisberg et al., 2015) in texture and mineral chemistry. Oxygen isotopic compositions are between those of ordinary and enstatite chondrites.

Specimens: 3 pieces of the meteorite (6.3, 16.2, and 18 g), polished and thin sections are deposited in Vernad. Anonymous finder, Mt. M. E. Nepomiluev (ramatahatta2@mail.ru), and Mt. T. V. Kryachko (bredfild@mail.ru) hold the main mass of the meteorite.

Bibliography:
  • Weisberg M.K., Ebel D.S., Nakashima D., Kita N.T., and Humayun M. (2015) Petrology and geochemistry of chondrules and metal in NWA 5492 and GRO 95551: A new type of metal-rich chondrite. Geochim. Cosmochim. Acta 167, 269-285. (link)
Data from:
  MB107
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:desert
Date:2017 Oct 21
Latitude:22°30.10'S
Longitude:69°08.20'W
Mass (g):240
Pieces:3
Class:Chondrite-ung
Shock stage:S1
Weathering grade:moderate
Fayalite (mol%):0.47±0.10 (N=74)
Ferrosilite (mol%):1.42±0.39 (N=42)
Wollastonite (mol%):0.88±0.63 (N=42)
Classifier:M.A. Ivanova, Vernad
Type spec mass (g):30
Type spec location:Vernad.
Main mass:Anonymous owner, Mr. M. E. Nepomiluev (ramatahatta2@mail.ru) and Mr. T. V. Kryachko (bredfild@mail.ru)
Finder:Mr. M.E. Nepomiluev (ramatahatta2@mail.ru), Mr. T.V. Kryachko (bredfild@mail.ru), and anonymous finder
Comments:Field names Calama 3-51, Misha 3-37 and KIR10; 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. 107, in preparation (2018)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Timur Kryachko      
Geography:

Chile
Coordinates:
     Recommended::   (22° 30' 6"S, 69° 8' 12"W)

Statistics:
     This is 1 of 1307 approved meteorites from Antofagasta, Chile (plus 1 unapproved name) (plus 1 impact crater)
     This is 1 of 1334 approved meteorites from Chile (plus 7 unapproved names) (plus 1 impact crater)
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