Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

PCA 91008

Newsletter

15,2

Location

Pecora Escarpment

Field Number

8801

Dimensions (cm)

3.9 x 3.1 x 3.4

Weight (g)

51.66

Original Classification

C2 Chondrite

Updated Classification

CM Chondrite (Anomalous)

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 1-37;Ferrosilite (mol%): 1-7

Weathering

Fracturing

Macroscopic Description - Robbie Marlow

Ninety percent of the exterior is covered with thin, dull, black fusion crust. A few irregular-shaped beige-colored inclusions dot the dark gray to black matrix. Tiny specks of metal are scattered throughout the interior.

Thin Section Description (,7) - Brian Mason

The section shows numerous small chondrules (up to 0.6 mm across), irregular aggregates, and mineral grains in a black matrix. Remnants of fusion crust are present along one edge. Microprobe analyses show olivine compositions mainly Fa_0-2, but with a few iron-rich grains; pyroxene compositions are mainly Fs₁, but range up to Fs₇. The meteorite is a C2 chondrite.

Reclassification Notes (AMN 41,1)

(Choe et al., 2010)

Antarctic Meteorite Images for Sample PCA 91008

Lab Photo(s) :

Lab Photo of Sample PCA 91008 (Photo Number s92-37808)

Lab Photo of Sample PCA 91008 (Photo Number s92-37809)

Lab Photo of Sample PCA 91008 (Photo Number s92-37810)

Lab Photo of Sample PCA 91008 (Photo Number s92-37811)

Lab Photo of Sample PCA 91008 (Photo Number s92-41836)

Antarctic Meteorite Images for Sample PCA 91008

Thin Section Photo(s) :

Thin Section Photo of Sample PCA 91008 in Cross-Polarized Light

Thin Section Photo of Sample PCA 91008 in Plane-Polarized Light

Thin Section Photograph of Sample PCA 91008 in Reflected Light

References for Sample PCA91008

King, A.J., Schofield, P.F., Russell, S.S., 2021, Thermal alteration of CM carbonaceous chondrites: Mineralogical changes and metamorphic temperatures. , Geochimica et Cosmochimica Acta, 298 , 167–190 , https://doi.org/10.1016/j.gca.2021.02.011 .

Krietsch, D., Busemann, H., Riebe, M.E.I., King, A.J., Alexander, C.M.O’D., Maden, C., 2021, Noble gases in CM carbonaceous chondrites: Effect of parent body aqueous and thermal alteration and cosmic ray exposure ages. , Geochimica et Cosmochimica Acta, 310 , 240–280 , https://doi.org/10.1016/j.gca.2021.05.050 .

Matzka, M., Lucio, M., Kanawati, B., Quirico, E., Bonal, L., Loehle, S., and Schmitt-Kopplin, P., 2021, Thermal History of Asteroid Parent Bodies Is Reflected in Their Metalorganic Chemistry. , The Astrophysical Journal Letters, 915 , L7 , https://doi.org/10.3847/2041-8213/ac0727 .

Tatsumi, E., Brunetto, R., and Hiroi, T., Sakatani, N., Riu, L., Matsuoka, M., Honda, R., Morota, T., Kameda, S., Nakamura, T., Zolensky, M., 2021, Spectrally blue hydrated parent body of asteroid (162173) Ryugu. , Nature Communications, 12 , 13-Jan , https://doi.org/10.1038/s41467-021-26071-8 .

Velbel, M.A., and Zolensky, M.E., 2021, Thermal metamorphism of CM chondrites: A dehydroxylation-based peak temperature thermometer and implications for sample return from asteroids Ryugu and Bennu. , Meteoritics & Planetary Science, 56 , 546–585 , doi: 10.1111/maps.13636 .

Amsellem, E., Moynier, F., Mahan, B., and Beck, P., 2020, Timing of thermal metamorphism in CM chondrites: Implications for Ryugu and Bennu future sample return. , Icarus, 339 , 113593 .

Hanna, R.D., Hamilton, V.E., Haberle, C.W., King, A.J., Abreu, N.M., and Friedrich, J.M., 2020, Distinguishing relative aqueous and heating among CM chondrites with IR spectroscopy. , Icarus, 346 , 113760 , doi: 10.1016/j.icarus.2020.113760 .

Kaplan, H.H., Connolly, H.C., Dotto, E., Emery, J.P., Fornasier, S., Lantz, C., Lim, L.F., Merlin, F., Praet, A., Reuter, D.C., Sanford, S.A., Hamilton, V.E., Simon, A.A., Takir, D., and Lauretta, D.S., Howell, E.S., Anderson, F.S., Barrucci, M.A., Brucato, J., Burbine, T.H., Clark, B.E., Cloutis, E.A., 2020, Visible-near infrared spectral indices for mapping mineralogy and chemistry with OSIRIS-Rex. , Meteoritics & Planetary Science, 55 , 744-765 , doi: 10.111/maps.13461.

Garenne, A., Beck, P., Montes-Hernandez, G., Bonal, L., Quirico, E., Proux, O., and Hazemann, J.L., 2019, The iron record of asteroidal processes in carbonaceous chondrites. , Meteoritics & Planetary Science, 54 , 2652-2665 , doi: 10.1111/maps.13377 .

Kaplan, H. H., Milliken, R. E., Alexander, C. M. O. D., & Herd, C. D. , 2019, Reflectance spectroscopy of insoluble organic matter (IOM) and carbonaceous meteorites. , Meteoritics & Planetary Science, 54 , 1051-1068 .

Alexander, C. M. O'D., Bowden, R., Fogel, M. L., Howard, K. T., 2015, Carbonate abundances and isotopic compositions in chondrites. , Meteoritics & Planetary Science, 50 , 810-833 , http://dx.doi.org/10.1111/maps.12410 .

Beck, P., Garenne, A., Quirico, E., Bonal, L., Montes-Hernandez, G., Moynier, F., Schmitt, B., 2014, Transmission infrared spectra (2-25 µm) of carbonaceous chondrites (CI, CM, CV-CK, CR, C2 ungrouped): Mineralogy, water, and asteroidal processes. , Icarus, 229 , Feb-14 , 263-277 , ISSN 0019-1035 , http://dx.doi.org/10.1016/j.icarus.2013.10.019 .

Tonui, E., Zolensky, M. E., Hiroi, T., Nakamura, T., Lipschutz, M. E, Wang, M. S., Okudaira, K., 2014, Petrographic, chemical and spectroscopic evidence for thermal metamorphism in carbonaceous chondrites I: CI and CM chondrites. , Geochimica et Cosmochimica Acta, 126 , 1-Feb-14 , 284-306 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2013.10.053 .

Orthous-Daunay, F. R., Quirico, E., Beck, P., Brissaud, O., Dartois, E., Pino, T., Schmitt, B., 2013, Mid-infrared study of the molecular structure variability of insoluble organic matter from primitive chondrites. , Icarus, 223 Issue 1 , 2013 , 534-543 , ISSN 0019-1035 , http://dx.doi.org/10.1016/j.icarus.2013.01.003 .

Briani, G., Kearsley, A. T., Russell, S. S., Quirico, E., Gounelle, M., Paulhiac-Pison, M., Montagnac, G., Beck, P., Orthous-Daunay, F. R., Bonal, L., Jacquet, E., 2013, Short duration thermal metamorphism in CR chondrites. , Geochimica et Cosmochimica Acta, 122 , 1-Dec-13 , 267-279 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2013.08.022 .

Alexander, C.O'D. M. O, Bowden,. R., Fogel, M. L., Howard, K. T., Herd, C. D. K., Nittler, L. R., 2012, The provenances of asteroids, and their contributions to the volatile inventories of the terrestrial planets. , Science, 337(6095) , 2012 , 721-723 .

Cloutis, E. A., Hudon, P., Hiroi, T., Gaffey, M. J., 2012, Spectral reflectance properties of carbonaceous chondrites 4: Aqueously altered and thermally metamorphosed meteorites. , Icarus, 220 Issue 2 , Aug-12 , 586-617 , ISSN 0019-1035 , http://dx.doi.org/10.1016/j.icarus.2012.05.018 .

Beck, P., De Andrade, V., Orthous-Daunay, F. R., Veronesi, G., Cotte, M., Quirico, E., Schmitt, B., 2012, The redox state of iron in the matrix of CI, CM and metamorphosed CM chondrites by XANES spectroscopy. , Geochimica et Cosmochimica Acta, 99 , 15-Dec-12 , 305-316 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2012.04.041 .

Alexander, C. M., Newsome, S. D., Fogel, M. L., Nittler, L. R, Busemann, H., Cody, G. D., 2010, Deuterium enrichments in chondritic macromolecular material-Implications for the origin and evolution of organics, water and asteroids. , Geochimica et Cosmochimica Acta, 74(15) , 2010 , 4417-4437 .

Yabuta, H., Alexander, C. M. O., Fogel, M. L., Kilcoyne, A. L. D., Cody, G. D., 2010, A molecular and isotopic study of the macromolecular organic matter of the ungrouped C2 WIS 91600 and its relationship to Tagish Lake and PCA 91008. , Meteoritics & Planetary Science, 45 , 1446-1460 , http://dx.doi.org/10.1111/j.1945-5100.2010.01117.x .

Choe, W. H., Huber, H., Rubin, A. E., Kallemeyn, G. W., Wasson, J. T., 2010, Compositions and taxonomy of 15 unusual carbonaceous chondrites. , Meteoritics & Planetary Science, 45 , 531-554 , http://dx.doi.org/10.1111/j.1945-5100.2010.01039.x .

Alexander, C. M. O'D., Fogel, M., Yabuta, H., Cody, G. D., 2007, The origin and evolution of chondrites recorded in the elemental and isotopic compositions of their macromolecular organic matter. , Geochimica et Cosmochimica Acta, 71 Issue 17 , 1-Sep-07 , 4380-4403 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2007.06.052 .

Wang, M. S., Lipschutz, M. E., 1998, Thermally metamorphosed carbonaceous chondrites from data for thermally mobile trace elements. , Meteoritics & Planetary Science, 33 , 1297-1302 .

RELAB, , Reflectance Experiment Lab , catalogue of samples, .

Antarctic Meteorite Petrographic Description

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