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Caleta el Cobre 022 | |||||||||||||||||||||||||||||||||||||||||
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Basic information | Name: Caleta el Cobre 022 This is an OFFICIAL meteorite name. Abbreviation: CeC 022 Observed fall: No Year found: 2016 Country: Chile Mass: ![]() | ||||||||||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 23 approved meteorites classified as Martian (nakhlite). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||||||||||||||
Comments: | Approved 10 Apr 2018 | ||||||||||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 107:
Caleta el Cobre 022 ~24°20’S, ~70°15’W Antofagasta, Chile Find: 2016 Nov Classification: Martian meteorite (Nakhlite) History: A single stone was found casually by a tourist family next to their night camp in the Atacama desert. The stone was presented to Rodrigo Martinez from MMC, and identified as a meteorite. A sample was then sent by the finder to CEREGE for classification. Physical characteristics: A single stone entirely covered by shiny fusion crust. Cut surface reveals a dark greenish coarse-grained interior with a few mm-sized orangish crystals. Magnetic susceptibility measured on several pieces is very homogeneous with log χ (× 10-9 m3/kg) = 3.93±0.01 (N=5, including measurement of the main mass remaining after cutting) Petrography: Cumulate texture with euhedral elongated augite crystals (typical size 1 mm by 300 μm) with interstitial plagioclase (typical size 250 μm, birefringent) and rare fine grained mesostasis. Olivine crystals (up to 2.5 mm) are crosscut and surrounded by aqueous alteration products ("iddingsite") and contain melt inclusions (to 100 μm). Thin sulfide veins (pyrrhotite) penetrate the olivine crystals. Other notable minerals: finely exsolved Fe-Ti oxides to 1 mm in size, with TiO2 16.8 wt% , Cr2O3 2.23 wt%, Al2O3 1.56 wt%, MgO 0.50 wt%, MnO 0.42 wt% (mean of 4 analyses with electron beam defocused to 10 μm). Modal abundances (from image analyses of a 2 cm2 polished section): pyroxene 69.0 vol%, plagioclase and mesostatis 27.1 vol%, olivine 2.2 vol%, opaque minerals 1.8 vol%. Magnetic measurements (hysteresis properties of a 360 mg piece) indicate a titanomagnetite content of at least 4.3 wt%. None of the silicates show petrological sign of shock. Geochemistry: Augite Fs28.4±2.9Wo40.0±0.6 (N=20), with Fe-rich ~10 umthick rims (cores down to Fs24.5, rims up to Fs33.3), FeO/MnO=37.4±3.6. Plagioclase An30.4±1.0Ab66.9±0.8Or2.8±0.4 (N=7). Olivine Fa70.2±3.4 (range Fa67.2-76.4), FeO/MnO=47.6±1.6 (N=7). Olivine alteration products (iddingsite) SiO2 53.2 wt%, FeO 26.1 wt%, MgO 2.5 wt%, Al2O3 0.56 wt%, MnO 0.32 wt%, CaO 0.21 wt%, K2O 0.18 wt%, Na2O 0.16 wt%, total 83.3 wt% (average of 5 analyses with electron beam defocused at 10 μm). The bulk chondrite-normalized REE pattern (V. Debaille, ULB) is similar to that of nakhlites. Classification: Martian (nakhlite). Minimal weathering. This nakhlite is unusually rich in plagioclase and in titanomagnetite. Specimens: 21 g, 3 polished sections, 1 thin polished section at CEREGE. Main mass with anonymous finder | ||||||||||||||||||||||||||||||||||||||||
Data from: MB107 Table 0 Line 0: |
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Institutions and collections |
CEREGE: CEREGE
BP 80
Avenue Philibert, Technopole de l'Arbois
13545 Aix-en-Provence Cedex 4
France, France (institutional address; updated 29 Oct 2018) MMC: Museo del Meteorito, Tocopilla 401, San Pedro de Atacama, Chile. or Alonso de Ercilla 1250, La Herradura, Coquimbo, Chile, Chile; Website (institutional address; updated 11 Mar 2014) ULB: Université libre de Bruxelles Avenue Franklin Roosevelt 50 - 1050 Bruxelles, Belgium (institutional address; updated 27 Sep 2018) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Geography:![]() |
Statistics: This is 1 of 1873 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater) This is 1 of 1901 approved meteorites from Chile (plus 11 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||||||||||
Proximity search: |