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Socorro
Basic information Name: Socorro
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2020
Country: Brazil
Mass:help 4.47 kg
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 264 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 31 Oct 2021
Writeuphelp
Writeup from MB 110:

Socorro        -8.1255556, -40.5172222

Pernambuco, Brazil

Find: 2019

Classification: Martian meteorite (Shergottite)

History: Found outside of Socorro, Pernambuco, Brazil, by a farmer cutting brush in 2019. He kept it as a strange rock unlike any others with thoughts that it could be a meteorite. After the nearby Santa Filomena meteorite fall in August 2020, the finder realized it was a meteorite and sent it to a relative in Miami, Florida. It was purchased by Michael Farmer soon after. Subsequently the entire main mass was sold to an anonymous meteorite collector. Finder wishes to remain anonymous.

Physical characteristics: Single stone, 4474 g, doubly oriented, flow-lined fusion crust. The interior of the stone is exposed on one side where the main flight-oriented nose has apparently been broken off at some time in the past, perhaps during Earth impact. Some weather-staining is present as orange-brown streaks on the fusion crust and the broken surface. A freshly chipped-off deposit sample reveals shiny maskelynite patches that are visible to the naked eye. A section oriented approximately orthogonal to the fusion crust layer was imaged using BSE, showing it to be highly vesicular with average apparent thickness ~250 μm.

Petrography: (C. Agee, UNM) The two major phases in this meteorite are clinopyroxene and maskelynite. Ubiquitous minor phases are merrillite/apatite, titanomagnetite, ilmenite and silica. The clinopyroxene has a modal abundance of approximately 60%, with significant core to rim zoning observed in backscattered electron images indicating an igneous crystallization trend with Mg-rich sub-calcic augite cores, mantled by intermediate pigeonite, and rimmed with ferropigeonite. Clinopyroxene average grain size is approximately 500-1000 μm. Maskelynite has modal abundance of approximately 30%, most grains are subophitic with maximum length ~1 mm. Merrillite laths are up to 1 mm in length. There are numerous domains of fine-grained intergrowths or quench crystals presumably formed during a shock event.

Geochemistry: (C. Agee, UNM) Clinopyroxene Fs57.3±21.4Wo19.5±7.5, core to rim range Fs29.0Wo30.6 (sub-calcic augite) – Fs83.5Wo11.7 (ferropigeonite), Fe/Mn=36±5, n=34; maskelynite An47.0±7.7Ab50.8±6.0Or2.2±1.8, n=11; fusion crust (20 μm defocused electron beam) SiO2=47.5±0.7, TiO2=0.96±0.04, Al2O3=11.9±0.3, MgO=4.1±0.1, FeO=18.9±0.3, MnO=0.44±0.03, CaO=9.8±0.1, Na2O=2.3±0.1 (all wt%), titanomagnetite FeO=52.8±1.2, Fe2O3=19.2±1.4, TiO2=24.2±1.1, Al2O3=1.9±0.6±0.4, (all wt%), n=3; Oxygen isotopes (K. Ziegler, UNM): 5 acid-washed fragments analyzed by laser fluorination gave δ18O= 4.914, 5.357, 4.665, 4.879, 5.073; δ17O= 2.834, 3.077, 2.730, 2.836, 2.951; Δ17O= 0.239, 0.249, 0.267, 0.260, 0.272 (linearized, per mil, TFL slope=0.528).

Classification: Evolved martian basalt, clinopyroxene compositional zoning trends are similar to QUE 94201.

Specimens: 20.2 g including a probe mount on deposit at UNM, anonymous holds the main mass.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Pernambuco
Place of purchase:Florida
Date:2019
Latitude:-8.1255556
Longitude:-40.5172222
Mass (g):4474
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):57.3±21.4
Wollastonite (mol%):19.5±7.5
Classifier:C. Agee, UNM
Type spec mass (g):20.2
Type spec location:UNM
Main mass:Anonymous
Comments:Submitted by C. Agee
Plots: O isotopes:  
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Brazil
Coordinates:
     Recommended::   (8° 7' 32"S, 40° 31' 2"W)

Statistics:
     This is 1 of 4 approved meteorites from Pernambuco, Brazil (plus 1 unapproved name)
     This is 1 of 83 approved meteorites from Brazil (plus 6 unapproved names) (plus 7 impact craters)
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