DOI: 10.1029/2018JE005602
Scopus记录号: 2-s2.0-85049826996
论文题名: Formation of Evolved Rocks at Gale Crater by Crystal Fractionation and Implications for Mars Crustal Composition
作者: Udry A. ; Gazel E. ; McSween H.Y. ; Jr.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 6 起始页码: 1525
结束页码: 1540
语种: 英语
英文关键词: continental crust
; felsic magmas
; fractional crystallization
; Gale crater
; intraplate volcanoes
; Mars
Scopus关键词: chemical composition
; continental crust
; crater
; crystal
; felsic rock
; fractional crystallization
; magma
; Mars
; mineralogy
; volcano
英文摘要: The recent discovery of some ancient evolved rocks in Gale crater by the Curiosity rover has prompted the hypothesis that continental crust formed in early Martian history. Here we present petrological modeling that attempts to explain this lithological diversity by magma fractionation. Using the thermodynamical software MELTS, we model fractional crystallization of different Martian starting compositions that might generate felsic igneous compositions like those analyzed at Gale crater using different variables, such as pressure, oxygen fugacities, and water content. We show that similar chemical and mineralogical compositions observed in Gale crater felsic rocks can readily be obtained through different degrees of fractional crystallization of basaltic compositions measured on the Martian surface. The results suggest that Gale crater rocks may not represent true liquids as they possibly accumulated and/or fractionated feldspars as well as other phases. In terms of major element compositions and mineralogy, we found that the Gale crater felsic compositions are more similar to fractionated magmas produced in Earth's intraplate volcanoes than to terrestrial felsic continental crust as represented by tonalite-trondhjemite-granodiorite suites. We conclude that the felsic rocks in Gale crater do not represent continental crust, as it is defined on 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/113740
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geoscience, University of Nevada, Las Vegas, Las Vegas, NV, United States; Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States; Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Knoxville, TN, United States
Recommended Citation:
Udry A.,Gazel E.,McSween H.Y.,et al. Formation of Evolved Rocks at Gale Crater by Crystal Fractionation and Implications for Mars Crustal Composition[J]. Journal of Geophysical Research: Planets,2018-01-01,123(6)