Significance

Tridymite, a SiO2 mineral that crystallizes at low pressures and high temperatures (>870 °C) from high-SiO2 materials, was detected at high concentrations in a sedimentary mudstone in Gale crater, Mars. Mineralogy and abundance were determined by X-ray diffraction using the Chemistry and Mineralogy instrument on the Mars Science Laboratory rover Curiosity. Terrestrial tridymite is commonly associated with silicic volcanism where high temperatures and high-silica magmas prevail, so this occurrence is the first in situ mineralogical evidence for martian silicic volcanism. Multistep processes, including high-temperature alteration of silica-rich residues of acid sulfate leaching, are alternate formation pathways for martian tridymite but are less likely. The unexpected discovery of tridymite is further evidence of the complexity of igneous petrogenesis on Mars, with igneous evolution to high-SiO2 compositions.

Abstract

Tridymite, a low-pressure, high-temperature (>870 °C) SiO2 polymorph, was detected in a drill sample of laminated mudstone (Buckskin) at Marias Pass in Gale crater, Mars, by the Chemistry and Mineralogy X-ray diffraction instrument onboard the Mars Science Laboratory rover Curiosity. The tridymitic mudstone has ∼40 wt.% crystalline and ∼60 wt.% X-ray amorphous material and a bulk composition with ∼74 wt.% SiO2 (Alpha Particle X-Ray Spectrometer analysis). Plagioclase (∼17 wt.% of bulk sample), tridymite (∼14 wt.%), sanidine (∼3 wt.%), cation-deficient magnetite (∼3 wt.%), cristobalite (∼2 wt.%), and anhydrite (∼1 wt.%) are the mudstone crystalline minerals. Amorphous material is silica-rich (∼39 wt.% opal-A and/or high-SiO2 glass and opal-CT), volatile-bearing (16 wt.% mixed cation sulfates, phosphates, and chlorides−perchlorates−chlorates), and has minor TiO2 and Fe2O3T oxides (∼5 wt.%). Rietveld refinement yielded a monoclinic structural model for a well-crystalline tridymite, consistent with high formation temperatures. Terrestrial tridymite is commonly associated with silicic volcanism, and detritus from such volcanism in a “Lake Gale” catchment environment can account for Buckskin’s tridymite, cristobalite, feldspar, and any residual high-SiO2 glass. These cogenetic detrital phases are possibly sourced from the Gale crater wall/rim/central peak. Opaline silica could form during diagenesis from high-SiO2 glass, as amorphous precipitated silica, or as a residue of acidic leaching in the sediment source region or at Marias Pass. The amorphous mixed-cation salts and oxides and possibly the crystalline magnetite (otherwise detrital) are primary precipitates and/or their diagenesis products derived from multiple infiltrations of aqueous solutions having variable compositions, temperatures, and acidities. Anhydrite is post lithification fracture/vein fill.

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Data Availability

Data deposition: CheMin and APXS experiment data records and CheMin diffraction patterns have been deposited with the NASA Planetary Data System at pds-geosciences.wustl.edu/msl/msl-m-chemin-4-rdr-v1/mslcmn_1xxx/ for the CheMin data and pds-geosciences.wustl.edu/msl/msl-m-apxs-4_5-rdr-v1/mslapx_1xxx/ for the APXS data.

Acknowledgments

We acknowledge the unwavering support of the JPL engineering and MSL operations staff. This research was supported by the NASA Mars Science Laboratory Mission. The MSL APXS was financed and managed by the Canadian Space Agency, with MacDonald Dettwiler & Assoc., Brampton, as prime subcontractor for the construction of the instrument. Operation of the MSL APXS is supported by CSA Contract 9F052-110786 and by NASA. Some of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. J.D.F. thanks the Danish Villum Foundation for support. S.P.S. acknowledges UK Space Agency funding.

Supporting Information

Appendix (PDF)
Supporting Information

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Information & Authors

Information

Published in

The cover image for PNAS Vol.113; No.26
Proceedings of the National Academy of Sciences
Vol. 113 | No. 26
June 28, 2016
PubMed: 27298370

Classifications

Data Availability

Data deposition: CheMin and APXS experiment data records and CheMin diffraction patterns have been deposited with the NASA Planetary Data System at pds-geosciences.wustl.edu/msl/msl-m-chemin-4-rdr-v1/mslcmn_1xxx/ for the CheMin data and pds-geosciences.wustl.edu/msl/msl-m-apxs-4_5-rdr-v1/mslapx_1xxx/ for the APXS data.

Submission history

Published online: June 13, 2016
Published in issue: June 28, 2016

Keywords

  1. Mars
  2. tridymite
  3. Gale crater
  4. lake
  5. volcanism

Acknowledgments

We acknowledge the unwavering support of the JPL engineering and MSL operations staff. This research was supported by the NASA Mars Science Laboratory Mission. The MSL APXS was financed and managed by the Canadian Space Agency, with MacDonald Dettwiler & Assoc., Brampton, as prime subcontractor for the construction of the instrument. Operation of the MSL APXS is supported by CSA Contract 9F052-110786 and by NASA. Some of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. J.D.F. thanks the Danish Villum Foundation for support. S.P.S. acknowledges UK Space Agency funding.

Authors

Affiliations

Richard V. Morris1 [email protected]
NASA Johnson Space Center, Houston, TX 77058;
David T. Vaniman
Planetary Science Institute, Tucson, AZ 85719;
David F. Blake
NASA Ames Research Center, Moffitt Field, CA 94035;
Ralf Gellert
Department of Physics, University of Guelph, Guelph, ON, Canada N1G 2W1;
Steve J. Chipera
Chesapeake Energy, Oklahoma City, OK 73118;
Elizabeth B. Rampe
Aerodyne Industries, Houston, TX 77058;
Douglas W. Ming
NASA Johnson Space Center, Houston, TX 77058;
Shaunna M. Morrison
Department of Geosciences, University of Arizona, Tucson, AZ 85721;
Robert T. Downs
Department of Geosciences, University of Arizona, Tucson, AZ 85721;
Allan H. Treiman
Lunar and Planetary Institute, Houston, TX 77058;
Albert S. Yen
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109;
John P. Grotzinger1 [email protected]
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125;
Cherie N. Achilles
Department of Geosciences, University of Arizona, Tucson, AZ 85721;
Thomas F. Bristow
NASA Ames Research Center, Moffitt Field, CA 94035;
Joy A. Crisp
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109;
David J. Des Marais
NASA Ames Research Center, Moffitt Field, CA 94035;
Jack D. Farmer
School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287;
Kim V. Fendrich
Department of Geosciences, University of Arizona, Tucson, AZ 85721;
Los Alamos National Laboratory, Los Alamos, NM 87545;
Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark;
Trevor G. Graff
Jacobs, Houston, TX 77058;
John-Michael Morookian
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109;
Edward M. Stolper
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125;
Susanne P. Schwenzer
Lunar and Planetary Institute, Houston, TX 77058;
Department of Environment, Earth and Ecosystems, The Open University, Milton Keynes MK7 6AA, United Kingdom

Notes

1
To whom correspondence may be addressed. Email: [email protected] or [email protected].
Author contributions: R.V.M., D.T.V., D.F.B., R.G., S.J.C., D.W.M., S.M.M., A.S.Y., J.P.G., T.F.B., and J.-M.M. designed research; R.V.M., D.T.V., D.F.B., R.G., S.J.C., E.B.R., D.W.M., S.M.M., R.T.D., A.H.T., A.S.Y., J.P.G., C.N.A., T.F.B., J.A.C., D.J.D.M., J.D.F., K.V.F., J.F., T.G.G., and J.-M.M. performed research; R.V.M., D.T.V., D.F.B., R.G., S.J.C., E.B.R., D.W.M., S.M.M., R.T.D., A.H.T., A.S.Y., J.P.G., C.N.A., T.F.B., J.A.C., D.J.D.M., J.D.F., K.V.F., J.F., T.G.G., J.-M.M., E.M.S., and S.P.S. analyzed data; and R.V.M. and J.P.G. wrote the paper.
Reviewers: J.B., Bristol University; R.M.H., Carnegie Institution of Washington; and H.Y.M., The University of Tennessee, Knoxville.

Competing Interests

The authors declare no conflict of interest.

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    Silicic volcanism on Mars evidenced by tridymite in high-SiO2 sedimentary rock at Gale crater
    Proceedings of the National Academy of Sciences
    • Vol. 113
    • No. 26
    • pp. 7003-E3810

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