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| Loongana 001 | |||||||||||||||||||||
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| Basic information | Name: Loongana 001 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 1990 Country: Australia Mass:  179 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 3 approved meteorites classified as CL4. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CL chondrites, and CL chondrites (equilibrated) | ||||||||||||||||||||
| Comments: | Revised 29 Aug 2021: Reclassification | ||||||||||||||||||||
| Writeup |
Writeup from MB 73:
Warning: the following text was scanned and may contain character recognition errors. Refer to the original to be sure of accuracy. Loongana 001 Nullarbor, Western Australia, Australia Found 1990 October Stone, carbonaceous chondrite, equilibrated Three pieces with a total weight of 179 g were found scattered among stones on a flat sandy plain. Type specimen, classification and analysis, olivine Fa11.4±0.3, pyroxene Fs7.5±2.2, all metal oxidized by weathering, contains CAIs, 22.0% total Fe, trace element pattern similar to Renazzo-type chondrites, F. Wlotzka, B. Spettel and H. Palme, Max-Planck-Institut fur Chemie, Mainz, Germany. See also Spettel et al. (1992). Information and main mass, David New, P. O. Box 278, Anacortes, Washington 98221, USA. Writeup from MB 110: Loongana 001 Western Australia, Australia Find: 1990 Revised classification and description Petrography: Carbonaceous chondrite with high chondrule abundance (67 vol%) and low amount of fine-grained matrix (20 vol%). Composed of irregularly formed Type-I chondrules, few Type-II chondrules, refractory inclusions (CAIs, AOAs), inter-chondrule metal and sulfide grains and matrix. Contains high amounts of (partly terrestrially oxidized) metal (magnetic susceptibility log χ (× 10-9 m3/kg) = 4.97). Mean chondrule size: 414±347 μm (75-2295 μm; n=235). Fragments of chondrules and refractory inclusions occur, but macroscopically this sample is unbrecciated. It is of shock stage C-S2 and has a weathering grade of W3. Geochemistry: Olivine is equilibrated with a mean value of Fa12.5±0.4. The mean composition of low-Ca pyroxene is Fs10.4±2.1 Wo0.9±0.3. Bulk oxygen isotopic composition: δ17O = -4.781±0.170; δ18O = -1.035±0.136; Δ17O = -4.243±0.099 per mil. Bulk Ti and Cr isotopic composition: ε50Ti ± 2σ = 2.57±0.09; ε54Cr ± 2σ = 0.68±0.18. Classification: Due to its characteristically low amount of matrix, highly depleted concentrations of volatile elements, high magnetic susceptibility, low Fa values of equilibrated olivine, and unique position in the ε50Ti-ε54Cr diagram, this sample was reclassified as a CL4 chondrite by Metzler et al. (2021). | ||||||||||||||||||||
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| Plots: | O isotopes: | ||||||||||||||||||||
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| References: | Published in Meteoritical Bulletin, no. 73, Meteoritics 27, 477-483 (1992) Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography:
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Statistics: This is 1 of 348 approved meteorites from Western Australia, Australia (plus 1 unapproved name) (plus 11 impact craters) This is 1 of 719 approved meteorites from Australia (plus 11 unapproved names) (plus 27 impact craters) | ||||||||||||||||||||
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