Geochemistry of the Martian Meteorite GRV 90027

Henian, Wang and Zhidong, Xie and Ying, Liang (2009) Geochemistry of the Martian Meteorite GRV 90027. Advances in Polar Science, 20 (2). pp. 110-134.

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Abstract

GRV 90027 is a Martian lherzolitic shergottites (L-S) containing poikilitic, non-poikilitic, and melted pocket components. GRV 99027 is mainly composed of olive (55 vol %) and pyroxene (37.5 vol %), with minor maskelynite (6 vol %) and chromite (1.5 vol %), and trace white lockite and troilite, ect. In this paper, the mineralogy and petrology of GRV 99027 are reported; in addition, the geochemical characteristics of the REEs and H isotopes in the GRV 99027 are also further investigated. The ∑REE in GRV 99027 is relatively low; HREEs are enriched in olivine and pyroxene grains; LREEs are enriched in plagioclase with a high positive Eu anomaly. High ∑REE value is found in rare mineral whitlockite (less than 0.2 vol %), LREE ≈ HREE, and whitlockite has a negative Eu anomaly. The REE distribution patterns of the whole rock of GRV 99027 is similar to but different from that of other L-S Martian meteorites, indicating that they came from different location of Mars. GRV 99027 has a high δD value. Different water-bearing minerals give different contribution for δD value. The δD of phosphates generally does not correlate with water content, and δD has a weak negative correlation with water content. GRV 99027 can be classified as an L-S Martian meteorite based on mineralogical assemblage patterns, REE distribution patterns, and hydrogen isotope. The isotope data of Sr, Nd, Pb, Os and REE from other L-S Martian meteorites were collected to discuss the formation history of the GRV 99027. Similar to other L-S Martian meteorites, GRV 99027 originated from part of Mars mantle; during one strong impact event about 4M years ago, the meteorites were ejected from deep mantle into space, and traveled for a different duration in space (indicated by different cosmic exposure time), and captured by the Earth later in different time, ultmiately falling on the Antarctica as L-S Martian meteor ites.

Item Type:	Article
Related URLs:
Keywords:	Martian meteorite, GRV 99027, lherzolitic, REE, Hydrogen isotope
Subjects:	Natural Environment > Space
Organizations:	Unspecified
Date Deposited:	07 Sep 2023 15:08
URI:	http://library.arcticportal.org/id/eprint/2379

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