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Queen Alexander Range (QUE) 94204 meteorite, Victoria Land, Eastern Antarctica, Antarctica

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Enstatite-rich Meteorite (EH7 Chondrite or achondrite??)
1994 find, 2.43 kg, weathered

Queen Alexander Range 94204 (QUE 94204) is a coarse-grained, unbrecciated Enstatite-rich stone (~70 vol%) accompanied by significant amounts of Fe-Ni metal, Troilite, and Plagioclase. Weathering products suggest an even larger initial metal component (~20%?). A number of minor phases - daubréelite, niningerite, oldhamite, schreibersite - frequently found in Enstatite Chondrites and/or Enstatite Achondrites have been reported by one or more observers. Severe weathering complicates the issue as metal, most oldhamite, and other reduced minerals have been replaced by terrestrial weathering products (e.g., calcite, goethite…). Still, the equigranular rounded Enstatite crystals and interstitial phases have been brought at least to the point of melting. In fact, QUE 94204 is but one of several enstatite-rich meteorites found as the Antarctic site which display magmatic textures.

However, such differences due to small sample size, intrinsic inhomogeneities, and differential weathering are relative minor problems expected with most meteorite finds. Classifying QUE 94204 has, however, presented major difficulties. Initially classified as an EH7 Enstatite Chondrite and still so listed at the Meteoritical Bulletin Database, Izawa et al., (2011) classified QUE 94204 as a 'Primitive Enstatite Achondrite' while van Niekerk et al., (2014) argue that QUE 94204 is best described as an 'Anomalous Enstatite Achondrite.' These and other disagreements about these ancient objects suggests about that our assumptions about their nature and formational environment are still incomplete.

Mineral List

21 entries listed. 14 valid minerals.

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Score, R. & Lindstrom, M. [eds](1996) Petrographic Descriptions: Antarctic Meteorite Newsletter 19 (1). (Feb 1996)

Weisberg, M. K., Prinz, M. & Nehru, C. E. (1997) QUE 94204 - an EH-chondritic melt rock (Conference Paper): Lunar and Planetary Science Conference XXVIII, pdf#1358: 525-526. (March 1997)

Izawa, M. R. M., Flemming, R. L., Banerjee, N. R. & Matveev, S. (2011) QUE 94204: A primitive enstatite achondrite produced by the partial melting of an E chondrite-like protolith. Meteoritics & Planetary Science 46 (11): 1742–1753. (Nov 2011)

van Niekerk, D., Keil, K. & Humayan, M. (2014) Petrogenesis of anomalous Queen Alexandra Range enstatite meteorites and their relation to enstatite chondrites, primitive enstatite achondrites, and aubrites: Meteoritics & Planetary Science 49 (3): 295-312. (March 2014)

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