DOI: 10.1002/2015GL063501
论文题名: Feldspathic rocks on Mars: Compositional constraints from infrared spectroscopy and possible formation mechanisms
作者: Rogers A.D. ; Nekvasil H.
刊名: Geophysical Research Letters
ISSN: 0094-8749
EISSN: 1944-8480
出版年: 2015
卷: 42, 期: 8 起始页码: 2619
结束页码: 2626
语种: 英语
英文关键词: anorthosite
; evolved
; feldspar
; felsic
; Mars
Scopus关键词: Infrared devices
; Infrared spectroscopy
; Structural geology
; Anorthosite
; Compositional constraints
; Evolved
; Felsic
; Mars
; Partial crystallization
; Plagioclase crystals
; Spectral measurement
; Feldspar
; feldspar
; infrared spectroscopy
; Mars
; planetary landform
; rock property
; Patera
英文摘要: Rare feldspar-dominated surfaces on Mars were previously reported based on near-infrared (NIR) spectral data and were interpreted to consist of anorthosite or felsic rocks. Using thermal infrared (TIR) data over the feldspar detections with the largest areal extent in Nili Patera and Noachis Terra, we rule out felsic interpretations. Basaltic or anorthositic compositions are consistent with TIR measurements, but the geologic contexts for these regions do not support a plutonic origin. Laboratory NIR spectral measurements demonstrate that large plagioclase crystals (>∼840 μm) can be detected in mixtures with as much as 50 vol % mafics, which is higher than the previously stated requirement of no more than 15% mafics. Thus, anorthositic or felsic interpretations need not be invoked for all NIR-based feldspar detections. Plagioclase-enriched basaltic eruptive products can be formed from Martian basalts through partial crystallization at the base of a thick crust, followed by low-pressure crystallization of the residual liquids. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84929514167&doi=10.1002%2f2015GL063501&partnerID=40&md5=10ce3ac2b7a74b8b8d03d9197f1f8f0f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8365
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Geosciences, State University of New York at Stony Brook, Stony Brook, NY, United States
Recommended Citation:
Rogers A.D.,Nekvasil H.. Feldspathic rocks on Mars: Compositional constraints from infrared spectroscopy and possible formation mechanisms[J]. Geophysical Research Letters,2015-01-01,42(8).