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Grapevine Mesa
Basic information Name: Grapevine Mesa
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2021
Country: United States
Mass:help 550 g
Classification
  history:
Recommended:  CBa    [explanation]

This is 1 of 8 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 15 Dec 2021
Writeuphelp
Writeup from MB 110:

Grapevine Mesa        35°58’54.00"N, 113°59’49.50"W

Arizona, United States

Find: 2021 Feb 6

Classification: Carbonaceous chondrite (CBa)

History: On the 6 February 2021, Todd Parker and Robert Ward were searching for gold with metal detectors on Grapevine Mesa, east of Meadview, Mohave County, Arizona. Parker detected a signal, which turned out to be three pieces weighing 252.5 g of a metal-rich meteorite. Together, they recovered 550.3 g in a 2 × 2 m area.

Physical characteristics: Exterior of the stones are rusty with patches of fusion crust. Interior of a 4 × 4.5 cm slice shows rounded to angular silicate fragments (to 1 cm) hosted by rounded to anhedral metal grains to 0.7 cm. Metal constitutes 69 areal% of the slice. The metal sizes, shapes, and distribution closely resemble that of Bencubbin.

Petrography: A 2 × 1.5 cm polished section shows metal grains composed of micron-sized polycrystalline kamacite containing an abundance of micron-sized troilite blebs and stringers (~1 areal%). Silicates consist of magnesian nonporpyritic silicate fragments with a cataclastic texture. White orange-stained silicate fragments separated by black opaque material hosting sub-mm-sized silicate fragments and rounded troilite and kamacite blebs. Thin terrestrial oxide veins are present around the metal grains.

Geochemistry: Oxygen isotopes (K. Ziegler, UNM): Seven fragments analyzed by laser fluorination gave δ18O = 6.949, 5.840, 4.998, 4.541, 5.968, 5.283; δ17O = 3.467, 2.239, 2.456, 1.485, 2.409, 2.091; Δ17O = -0.202, -0.845, -0.183, -0.913, -0.742, -0.699 (linearized, all per mil, TFL slope = 0.528). Average of the seven analyses gives δ18O = 5.596±8.848, δ17O = 2.358±0.646, Δ17O = -0.597±0.323. EPMA (L. Garvie, ASU): Low Ca pyroxene Fs3.17±0.79Wo1.88±2.62 (n=4), Al2O3 = 0.4 to 3.2, TiO2 = 0.1 to 0.2, and Cr2O3 = 0.4 to 0.7 (all wt%); High Ca pyroxene Fs3.37Wo38.45 (n=1), Al2O3 = 7.9, TiO2 = 1.0, and Cr2O3 = 1.5 (all wt%); Olivine Fa3.67 and 4.71; Metal (wt%) Ni = 7.03±0.70, Co = 0.33±0.04, Cr = 0.20±0.09, and P = 0.33±0.04.

Classification: The meteorite mineralogically matches that of the subgroup A (CBa) Bencubbin-like carbonaceous chondrites. The oxygen isotopes follow on an extension of the current bencubbinite field.

Specimens: Largest mass of 61 g is with Robert RWard. 21 g and a polished mount at ASU.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Arizona
Date:2021 Feb 6
Latitude:35°58'54.00"N
Longitude:113°59'49.50"W
Mass (g):550.3
Pieces:many
Class:CBa
Shock stage:medium
Weathering grade:W2
Classifier:L. Garvie, ASU, K. Ziegler, UNM
Type spec mass (g):21
Type spec location:ASU
Main mass:RWard
Finder:Todd Parker, RWard
Comments:ASU#2167; submitted by L. Garvie
Plots: O isotopes:  
Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
RWard: No contact information provided. (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Public domain photographs:
Laurence Garvie      
Geography:

United States
Coordinates:
     Recommended::   (35° 58' 54"N, 113° 59' 49"W)

Statistics:
     This is 1 of 178 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1885 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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