DOI: 10.1038/ngeo1995
论文题名: Ancient plutonic processes on Mars inferred from the detection of possible anorthositic terrains
作者: Carter J. ; Poulet F.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 12 起始页码: 1008
结束页码: 1012
语种: 英语
Scopus关键词: anorthosite
; crust
; crystallization
; iron
; magma
; magmatism
; Mars
; melt
; mineralogy
; plagioclase
; pluton
; plutonism
; silicate
; solar system
; terrain
英文摘要: The mineralogical diversity preserved on ancient terrains of Mars provides insights into the planet's early geological state and subsequent evolution. The martian crust is predominantly composed of mafic rocks with low silica contents, with the exception of a few localized volcanic sequences that indicate some compositional evolution towards compositions richer in silicate minerals. Anorthosite, which is dominated by the silicate mineral plagioclase, is rare in the Solar System. It is thought to require an evolved magmatic source in which lighter elements have been concentrated. Anorthosite has been observed previously only on Earth within localized continental plutons of intrusive igneous origin, and more widely on the Moon where the anorthositic highland crust is thought to derive from crystallization of a primordial magma ocean. Using near-infrared spectral data obtained by the Mars Reconnaissance Orbiter, we report the detection of iron-bearing plagioclase-rich rocks at eight sites in the southern highlands of Mars with a spectral signature consistent with ferroan anorthosites. The paucity of detections suggests a localized plutonic origin similar to terrestrial anorthosites, although a lunar-like global anorthosite crust on early Mars cannot be entirely excluded. Our detections of anorthositic compositions at several locations on the martian surface suggest that magmatic processes that produce highly evolved melts were active on ancient Mars. © 2013 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106642
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: European Southern Observatory, Vitacura 763 0355, Santiago, Chile; Institut d'Astrophysique Spatiale, Université Paris-Sud, Orsay 91405, France
Recommended Citation:
Carter J.,Poulet F.. Ancient plutonic processes on Mars inferred from the detection of possible anorthositic terrains[J]. Nature Geoscience,2013-01-01,6(12)