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Diverse mineral assemblages of acidic alteration in the Rio Tinto area (southwest Spain): Implications for Mars

  • Christian Mavris , Javier Cuadros EMAIL logo , José Miguel Nieto , Janice L. Bishop and Joseph R. Michalski
Published/Copyright: November 28, 2018
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American Mineralogist
From the journal American Mineralogist Volume 103 Issue 12

Abstract

Earth analogs are indispensable to investigate mineral assemblages on Mars because they enable detailed analysis of spectroscopic data from Mars and aid environmental interpretation. Samples from four sites in the Iberian Pyrite Belt (El Villar, Calañas, Quebrantahuesos, and Tharsis) were investigated using mineralogical, chemical, and spectroscopic techniques, with a focus on clay minerals and alteration environments. They represent Earth analogs of areas on Mars that underwent acidic alteration. X‑ray diffraction and transmittance mid-infrared data indicate that the rocks were subjected to several degrees of acid alteration corresponding to assemblages characterized by the following mixtures: (1) illite, chlorite, interstratified chlorite-vermiculite, kaolinite-smectite, and kaolinite; (2) illite, kaolinite, and alunite; and (3) jarosite and goethite. According to mineral stability data, these three assemblages correspond to pH values 7–5, 5–3, and <3, respectively. The lack of goethite in the illite-kaolinitealunite assemblage suggests an alteration in reducing conditions. Illite was progressively dissolved by acidic alteration but is sufficiently resilient not to be diagnostic of the intensity of the alteration. Illite and kaolinite were the two most abundant phyllosilicate minerals observed, and the main reaction involving phyllosilicates was the alteration of illite to kaolinite. Mixed-layer phases appeared mainly in the mildest degree of acid alteration, with few exceptions. This suggests a transition from a mechanism dominated by transformation to a mechanism dominated by dissolution-precipitation as the intensity of the acid alteration increases. Our results highlight the sparse kaolinite–alunite occurrences on Mars as worthy of specific investigation. Acid alteration on Mars is expected to be patchy and/or consisting of fine alteration rims. Alunite occurrences on Mars in the absence of goethite may indicate an acid alteration in reducing conditions. Kaolinite produced through acid alteration on Mars is expected to exist mainly as an end-member phase of low crystallinity, which would enhance IR absorption and increase its visibility.

Keywords: Acid alteration; alunite; jarosite; kaolinite; Mars; Earth Analogs for Martian Geological Materials and Processes

Acknowledgments

This work was funded by the European Commission (Marie Curie Fellowship “Acid-Mars” to C.M.). We thank Raquel Vega for invaluable assistance in the field. The helpful comments of S. Potter-McIntyre and L. Baker are greatly appreciated.

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Received: 2017-10-13
Accepted: 2018-07-26
Published Online: 2018-11-28
Published in Print: 2018-12-19

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.2138/am-2018-6330
Keywords for this article
Acid alteration; alunite; jarosite; kaolinite; Mars; Earth Analogs for Martian Geological Materials and Processes

Articles in the same Issue

  1. Letter
  2. Rapid solid-state sintering in volcanic systems
  3. How geometry and anisotropy affect residual strain in host-inclusion systems: Coupling experimental and numerical approaches
  4. Special collection: Earth analogs for martian geological materials and processes
  5. Diverse mineral assemblages of acidic alteration in the Rio Tinto area (southwest Spain): Implications for Mars
  6. Special collection: From magmas to ore deposits
  7. Archaean hydrothermal fluid modified zircons at Sunrise Dam and Kanowna Belle gold deposits, Western Australia: Implications for post-magmatic fluid activity and ore genesis
  8. Special collection: Water in nominally hydrous and anhydrous minerals
  9. New high-pressure phases in MOOH (M = Al, Ga, In)
  10. Articles
  11. Nuwaite (Ni6GeS2) and butianite (Ni6SnS2), two new minerals from the Allende meteorite: Alteration products in the early solar system
  12. The role of magma mixing, identification of mafic magma inputs, and structure of the underlying magmatic system at Mount St. Helens
  13. Thermodynamic properties of natural melilites
  14. Thermal conductivity anomaly in spin-crossover ferropericlase under lower mantle conditions and implications for heat flow across the core-mantle boundary
  15. Electronic properties and compressional behavior of Fe–Si alloys at high pressure
  16. Diffusion of molybdenum and tungsten in anhydrous and hydrous granitic melts
  17. High-pressure single-crystal structural analysis of AlSiO3OH phase egg
  18. Structural variations along the apatite F-OH join
  19. Raman modes of carbonate minerals as pressure and temperature gauges up to 6 GPa and 500 °C
  20. Crystallization conditions of micas in oxidized igneous systems
  21. The role of crustal melting in the formation of rhyolites: Constraints from SIMS oxygen isotope data (Chon Aike Province, Patagonia, Argentina)
  22. New Mineral Names
  23. Book Review
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