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Zagami Martian meteorite, Katsina State, Nigeria
Fine-grained pyroxene-rich basalt very similar to Shergotty, consisting of 75% pyroxene (pigeonite and augite) and 18 % plagioclase glass.
Shock stage of S5-S6.
Presence of shock-induced melt-veins with amorphous silicate-perovskite and amorphous silicate-titanite glasses.
Omphacite, stishovite, plagioclase and akimotoite crystallized from the melt during decompression.
(Cf. Zhidong Xie et al., 2005).
Mineral List
19 entries listed. 12 valid minerals.
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References
-T.J. McCoy, M. Wadhwa, K. Keil, (1999) New lithologies in the Zagami meteorite: evidence for fractional crystallization of a single magma unit on Mars, Geochimica et Cosmochimica Acta, Volume 63, Issues 7–8, April 1999, Pages 1249-1262, ISSN 0016-7037, 10.1016/S0016-7037(99)00015-0.
Langenhorst, F. and Poirier, J.-P. (2000a): Anatomy of black veins in Zagami: clues to the formation of high-pressure phase. Earth Planet. Sci. Lett. 184, 37-55.
- Langenhorst, F. and Poirier, J.-P. (2000b): ‘Eclogitic’ minerals in a shocked basaltic meteorite. Earth Planet. Sci. Lett. 176, 259-265.
- Zhidong Xie et al. (2005): Lunar and Planetary Science XXXVI (2005), 1216.pdf
Langenhorst, F. and Poirier, J.-P. (2000a): Anatomy of black veins in Zagami: clues to the formation of high-pressure phase. Earth Planet. Sci. Lett. 184, 37-55.
- Langenhorst, F. and Poirier, J.-P. (2000b): ‘Eclogitic’ minerals in a shocked basaltic meteorite. Earth Planet. Sci. Lett. 176, 259-265.
- Zhidong Xie et al. (2005): Lunar and Planetary Science XXXVI (2005), 1216.pdf
External Links
- http://www.bgi.uni-bayreuth.de/?page=5&view=1&year=2000&content=49
(2000 Annual Report, Discovery of high-pressure minerals in the Martian basalt Zagami: clues to the mineralogical complexity of planetary mantles (F. Langenhorst and J.-P. Poirier)
- http://curator.jsc.nasa.gov/antmet/mmc/zagami.pdf
- http://curator.jsc.nasa.gov/antmet/mmc/refs/REFZagami.pdf
(2000 Annual Report, Discovery of high-pressure minerals in the Martian basalt Zagami: clues to the mineralogical complexity of planetary mantles (F. Langenhorst and J.-P. Poirier)
- http://curator.jsc.nasa.gov/antmet/mmc/zagami.pdf
- http://curator.jsc.nasa.gov/antmet/mmc/refs/REFZagami.pdf
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Locality Updated: Larson Exploration Prospect, Menominee Range, Florence Co., Wisconsin, USAFrom Bill Cordua, 19th Jun 2013 03:45:17