Planetary science: Bedrock formation at Meridiani Planum (Reply)

Details Planetary science: Bedrock formation at Meridiani Planum (Reply) Planetary science: Bedrock formation at Meridiani Planum (Reply)

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006natur.443e...2m&link_type=abstract

Nature, Volume 443, Issue 7107, pp. 2 (2006).

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Squyres et al. contend that our proposed volcanic origin for Meridiani Planum is inconsistent with more recently obtained data. But although the new data reveal some variation in chemical composition, this variation is small (Fig. 1a) and mainly due to modest variations in magnesium and sulphur, with concentrations of the other elements remaining essentially constant. In a volcanic model, this variation can be readily explained by mobilization of highly soluble magnesium sulphate salts during the later stages of alteration and diagenesis (Fig. 1a), as in the sedimentary/evaporite model in which sediments that were initially deposited with uniform composition are subsequently modified. Although morphological features in the bedrock may be consistent with aeolian and fluvial origins, this interpretation is not unique, particularly as features with similar grain size, sorting and morphology are seen in base surge deposits. Neither chemical nor morphological data therefore preclude a volcanic origin.

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