DOI: 10.1029/2017JE005493
Scopus记录号: 2-s2.0-85047653487
论文题名: Phosphorous Immobility During Formation of the Layered Sulfate Deposits of the Burns Formation at Meridiani Planum
作者: McCollom T.M. ; Donaldson C. ; Moskowitz B. ; Berquó T.S. ; Hynek B.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 5 起始页码: 1230
结束页码: 1254
语种: 英语
英文关键词: acid-sulfate
; Mars
; Meridiani Planum
; phosphorous
Scopus关键词: bedrock
; chemical composition
; crust
; formation mechanism
; immobilization
; layered medium
; Mars
; phosphorus
; planetary surface
; sulfate
英文摘要: The relatively high abundance of phosphorous (P) in rocks from the Martian crust makes it a potentially useful element for tracking geochemical processes. Owing to the high solubility of common P-bearing minerals such as apatite at low pH, P is widely thought to be mobile under acid-sulfate conditions. Accordingly, transport of P by acidic fluids has been invoked to explain enrichments or depletions of this element in some rocks and soils from Mars. The sediments that compose the layered-sulfate deposits of the Burns formation at Meridiani Planum were originally derived from a basaltic precursor but appear to have been exposed to acidic, sulfate-rich fluids at several intervals during their history. Yet, assessment of the chemical composition of the bedrocks indicates that they maintain pristine igneous P:Ti ratios and P abundances similar to Martian basalts, indicating that there has been little or no transport of P into or out of the deposits at any stage in their formation. Potential reservoirs for P in the deposits include basaltic glass, secondary Fe- or Al-phosphate minerals, substitution of PO4 for SO4 in alunite-jarosite group minerals, or surface adsorption. Although Fe-phosphates were not among the minerals detected by the Mössbauer spectrometer onboard the Opportunity rover at Meridiani, it might be difficult to detect such minerals even if they are present because they are below the detection limit or have signatures similar to other minerals. Overall, the results demonstrate that P can be immobile even in some acid-sulfate environments on Mars and Earth. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113913
Appears in Collections: 气候减缓与适应
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作者单位: Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; Department of Earth Sciences, University of Minnesota, Minneapolis, MN, United States; Institute for Rock Magnetism, University of Minnesota, Minneapolis, MN, United States; Department of Physics, Concordia College, Moorhead, MN, United States; Department of Geological Sciences, University of Colorado Boulder, Boulder, CO, United States
Recommended Citation:
McCollom T.M.,Donaldson C.,Moskowitz B.,et al. Phosphorous Immobility During Formation of the Layered Sulfate Deposits of the Burns Formation at Meridiani Planum[J]. Journal of Geophysical Research: Planets,2018-01-01,123(5)