DOI: 10.1038/ngeo1994
论文题名: Prolonged magmatic activity on Mars inferred from the detection of felsic rocks
作者: Wray J.J. ; Hansen S.T. ; Dufek J. ; Swayze G.A. ; Murchie S.L. ; Seelos F.P. ; Skok J.R. ; Irwin R.P. ; Ghiorso M.S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 12 起始页码: 1013
结束页码: 1017
语种: 英语
Scopus关键词: chemical weathering
; continental crust
; crater
; crystallization
; detection method
; feldspar
; felsic rock
; magmatism
; Mars
; phase equilibrium
; plate tectonics
; quartz
; siliceous deposit
; thermodynamics
; upper crust
; volcanism
英文摘要: Rocks dominated by the silicate minerals quartz and feldspar are abundant in Earth's upper continental crust. Yet felsic rocks have not been widely identified on Mars, a planet that seems to lack plate tectonics and the associated magmatic processes that can produce evolved siliceous melts on Earth. If Mars once had a feldspar-rich crust that crystallized from an early magma ocean such as that on the Moon, erosion, sedimentation and volcanism have erased any clear surface evidence for widespread felsic materials. Here we report near-infrared spectral evidence from the Compact Reconnaissance Imaging Spectrometer for Mars onboard the Mars Reconnaissance Orbiter for felsic rocks in three geographically disparate locations on Mars. Spectral characteristics resemble those of feldspar-rich lunar anorthosites, but are accompanied by secondary alteration products (clay minerals). Thermodynamic phase equilibrium calculations demonstrate that fractional crystallization of magma compositionally similar to volcanic flows near one of the detection sites can yield residual melts with compositions consistent with our observations. In addition to an origin by significant magma evolution, the presence of felsic materials could also be explained by feldspar enrichment by fluvial weathering processes. Our finding of felsic materials in several locations on Mars suggests that similar observations by the Curiosity rover in Gale crater may be more widely applicable across the planet. © 2013 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106637
Appears in Collections: 气候减缓与适应 科学计划与规划
There are no files associated with this item.
作者单位: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States; US Geological Survey, Denver, CO 80225, United States; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723, United States; Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, United States; Center for Earth and Planetary Studies, National Air and Space Museum, Smithsonian Institution, Washington DC 20013, United States; OFM Research, Seattle, WA 98115, United States
Recommended Citation:
Wray J.J.,Hansen S.T.,Dufek J.,et al. Prolonged magmatic activity on Mars inferred from the detection of felsic rocks[J]. Nature Geoscience,2013-01-01,6(12)