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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

SCImago Journal Rank (SJR) 2017: 1.440
Source Normalized Impact per Paper (SNIP) 2017: 1.059

Online
ISSN
1945-3027
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Volume 99, Issue 10

Issues

What Lurks in the martian Rocks and Soil? Investigations of Sulfates, Phosphates, and Perchlorates. Gypsum in modern Kamchatka volcanic hot springs and the Lower Cambrian black shale: Applied to the microbial-mediated precipitation of sulfates on Mars

Min Tang / Anouk Ehreiser
  • Department of Earth Sciences, The University of Hong Kong, Pokfulam, Hong Kong
  • Department of Physics and Astronomy, Heidelberg University, Postfach 10 57 60, 69047 Heidelberg, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Yi-Liang Li
Published Online: 2014-10-14 | DOI: https://doi.org/10.2138/am-2014-4754

Abstract

Gypsum is a mineral that commonly precipitates in hydrothermal environments. This study reports the electron microscopic analyses of gypsum morphologies and crystal sizes found in hot springs on the Kamchatka Peninsula, Russia, and compares these analyses with gypsum morphologies of hydrothermal genesis found in Lower Cambrian black shale. In sediments of the Kamchatka hot springs, we observed prismatic, prismatic pseudo-hexagonal, fibrous, tubular, lenticular and twinned gypsum crystals, with crystal sizes ranging from <200 nm to >200 μm. The coexistence of diverse crystal habits of gypsum implies a constant interaction between hot spring geochemistry and the metabolisms of the microbial community. The crystallization of Ca- and Ba-sulfates in the black shale of the Lower Cambrian, which shows similar but less varied morphology, was influenced by post-depositional hydrothermal fluids. The partial replacement of pyrite by sulfates in a situation coexisting with rich biomass deposits and animal fossils indicates limited modification of the sedimentary records by biological materials. If the gypsum precipitated on Mars underwent similar interactions between microbial communities and their geochemical environments, the resulting crystal habits could be preserved even better than those on Earth due to the weak geodynamics prevailing on Mars throughout its evolutionary history.

Keywords: Kamchatka; volcanic hot spring; Lower Cambrian; geothermal system; gypsum; Mars

About the article

Received: 2013-09-25

Accepted: 2014-03-21

Published Online: 2014-10-14

Published in Print: 2014-10-01


Citation Information: American Mineralogist, Volume 99, Issue 10, Pages 2126–2137, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2014-4754.

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© 2014 by Walter de Gruyter Berlin/Boston. This work is licensed under the MSA License. (view license)

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