Book contents
- Frontmatter
- Contents
- List of contributors
- Foreword
- Acknowledgments
- Part I Introduction and historical perspective
- Part II Elemental Composition: Orbital and in situ Surface Measurements
- Part III Mineralogy and Remote Sensing of Rocks, Soil, Dust, and Ices
- Part IV Physical Properties of Surface Materials
- Part V Synthesis
- 22 Implications of observed primary lithologies
- 23 Aqueous alteration on Mars
- 24 The sedimentary rock cycle of Mars
- 25 Martian polar processes
- 26 Astrobiological implications of Mars' surface composition and properties
- Part VI Summary, Upcoming Missions, and New Measurement Needs
- Index
- Plate section
- References
24 - The sedimentary rock cycle of Mars
from Part V - Synthesis
Published online by Cambridge University Press: 10 December 2009
- Frontmatter
- Contents
- List of contributors
- Foreword
- Acknowledgments
- Part I Introduction and historical perspective
- Part II Elemental Composition: Orbital and in situ Surface Measurements
- Part III Mineralogy and Remote Sensing of Rocks, Soil, Dust, and Ices
- Part IV Physical Properties of Surface Materials
- Part V Synthesis
- 22 Implications of observed primary lithologies
- 23 Aqueous alteration on Mars
- 24 The sedimentary rock cycle of Mars
- 25 Martian polar processes
- 26 Astrobiological implications of Mars' surface composition and properties
- Part VI Summary, Upcoming Missions, and New Measurement Needs
- Index
- Plate section
- References
Summary
Abstract
Orbital and landed missions have demonstrated that Mars possesses an extensive and diverse sedimentary rock record that is mostly ancient. Many observed or inferred processes appear familiar to sedimentary geologists but, in detail, the sedimentary record of Mars differs in fundamental ways from the terrestrial record. Mars is a basaltic planet and accordingly, the provenance of sedimentary material, including particulate debris and aqueous fluids from which chemical constituents precipitate, is composed of basalt rather than intermediate to felsic igneous compositions characteristic of terrestrial upper continental crust. Aqueous alteration, observed on Mars and studied experimentally, indicates surficial processes dominated by low pH; under acidic conditions, many chemical relationships that are characteristic of terrestrial weathering do not apply. Aluminum and Fe are far more soluble and mobile, Si mobility is limited by fluid/rock ratio and iron oxidation rates are sluggish. Low fluid/rock ratios are indicted by the observation that only the most soluble minerals (olivine, Fe-Ti oxides, phosphates, possibly pyroxene) appear to be widely involved in surface alteration with little evidence for involvement of relatively insoluble plagioclase. An intriguing result, from both global-scale orbital and detailed surface spectroscopy, and geochemistry obtained by rovers, is that evaporitic processes, leading to a wide variety of Ca-, Mg- and Fe-bearing sulfates in sedimentary rocks, alteration profiles, and soils, appear to have been common throughout Martian geological history. Investigations by Spirit and Opportunity demonstrate that classical stratigraphy and sedimentology can be accomplished on the Martian surface using remote techniques.
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- Information
- The Martian SurfaceComposition, Mineralogy and Physical Properties, pp. 541 - 577Publisher: Cambridge University PressPrint publication year: 2008
References
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