期刊
ICARUS
卷 181, 期 2, 页码 408-418出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.icarus.2005.11.020
关键词
infrared observations; Mars, surface; mineralogy; spectroscopy
The gray crystalline hematite at Meridiani Planum first discovered by the Mars Global Surveyor Thermal Emission Spectrometer (MGS-TES) instrument occurs as spherules that have been interpreted as concretions. Analysis of the TES and mini-TES spectra shows that no 390 cm(-1) feature is present in the characteristic martian hematite spectrum. Here, we incorporate the mid-IR optical constants of hematite into a simple Fresnel reflectance model to understand the effect of emission angle and crystal morphology on the presence or absence of the 390 cm(-1) feature in an IR hematite spectrum. Based on the results we offer two models for the internal structure of the martian hematite spherules. (c) 2005 Elsevier Inc. All rights reserved.
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