DOI: 10.1029/2018JE005630
Scopus记录号: 2-s2.0-85053401927
论文题名: Effect of Solution pH and Chloride Concentration on Akaganeite Precipitation: Implications for Akaganeite Formation on Mars
作者: Peretyazhko T.S. ; Ming D.W. ; Rampe E.B. ; Morris R.V. ; Agresti D.G.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 8 起始页码: 2211
结束页码: 2222
语种: 英语
英文关键词: akaganeite
; CheMin
; CRISM
; formation
; Mars
; Mossbauer
英文摘要: Akaganeite, a chloride-bearing Fe(III) (hydr)oxide, has been reported on Mars in Yellowknife Bay in Gale crater by X-ray diffraction (XRD), in Robert Sharp crater by Compact Reconnaissance Imaging Spectrometer for Mars, and possibly at the Gusev crater and Meridiani Planum by combined Mössbauer and bulk chemistry analyses. Because formation conditions remain unknown, we investigated akaganeite precipitation as a function of solution pH and chloride concentration. Akaganeite was synthesized through hydrolysis of Fe(III) perchlorate in the presence of 0.02, 0.05, and 0.1 M chloride and at initial solution pH of 1.6, 4, 6, and 8 at 90 °C. Mineralogy of the precipitated Fe(III) (hydr)oxides was characterized by XRD, infrared spectroscopy, and Mössbauer spectroscopy. Total chloride and perchlorate contents were determined by ion chromatography. XRD revealed that akaganeite formed alone or in mixtures with ferrihydrite, hematite, and/or goethite at initial pH 1.6 with 0.02, 0.05, and 0.1 M Cl− and at initial pH from 4 to 8 with 0.05 and 0.1 M Cl−. Infrared analysis showed that akaganeite bands at ~2 and ~2.45 μm were sensitive to amount of akaganeite, total chloride content, and presence of other Fe(III) (hydr)oxides. The results indicate that akaganeite in Yellowknife Bay in Gale crater likely formed under acidic to alkaline (1.6 < pH < 8) oxidizing conditions in solutions containing >0.05 M Cl− by the dissolution of basaltic minerals. Akaganeite in Robert Sharp crater may have formed in acidic (pH < 4) solutions with ~0.1 M Cl− through oxidative dissolution of Fe(II) sulfides and/or acidic oxidizing dissolution of basalts. ©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/113415
Appears in Collections: 气候减缓与适应
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作者单位: Jacobs, NASA Johnson Space Center, Houston, TX, United States; NASA Johnson Space Center, Houston, TX, United States; Department of Physics, University of Alabama at Birmingham, Birmingham, AL, United States
Recommended Citation:
Peretyazhko T.S.,Ming D.W.,Rampe E.B.,et al. Effect of Solution pH and Chloride Concentration on Akaganeite Precipitation: Implications for Akaganeite Formation on Mars[J]. Journal of Geophysical Research: Planets,2018-01-01,123(8)