期刊
GEOPHYSICAL RESEARCH LETTERS
卷 42, 期 8, 页码 2619-2626出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL063501
关键词
Mars; feldspar; felsic; anorthosite; evolved
资金
- Mars Odyssey project
- NASA Mars Data Analysis Program [NNX14AM26G]
- NASA Mars Fundamental Research Program [NNX13AG82G]
- NASA [NNX13AG82G, 679182, 474070, NNX14AM26G] Funding Source: Federal RePORTER
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 mu m) can be detected in mixtures with as much as 50vol % 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.
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