Mathematics – Logic
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10225581l&link_type=abstract
Journal of Geophysical Research, Volume 102, Issue E11, p. 25581-25592
Mathematics
Logic
27
Planetology: Comets And Small Bodies
Scientific paper
The objective of this study is to present the thermal emission spectra of various anhydrous, calcite- and dolomite-series carbonate minerals to illustrate the effect of the structural cation (Ca2+, Mg2+, Fe2+, Mn2+, Zn2+) on shifting the positions of the carbonate absorption bands. All of the carbonate mineral emission spectra included in this study exhibit three absorption features related to three specific vibrational modes of the carbonate anion (CO2-3). These anion vibrations include the out-of-plane bend, the asymmetric stretch, and the in-plane bend (i.e., the ν2,ν3, and ν4 modes, respectively). The positions of the absorption-band emissivity minima are unique for each carbonate chemistry and are thus diagnostic of mineralogy. The average ν2, ν3, and ν4 wavenumber positions for the various carbonate minerals are as follows: calcite (CaCO3) 883, 1523, and 712cm-1 magnesite (MgCO3) 901, 1572, and 748cm-1 siderite (FeCO3) 876, 1523, and 736cm-1 rhodochrosite (MnCO3) 901, 1572, and 748cm-1 siderite (FeCO3) 876, 1523, and 736cm-1 rhodochrosite (MnCO3) 877, 1535, and 726cm-1 smithsonite (ZnCO3) 882, 1509, and 742cm-1 dolomite (CaMg(CO3)2) 894, 1547, and 728cm-1 and kutnahorite (CaMn(CO3)2) 882, 1526, and 716cm-1. Carbonates as a general mineral class crystallize in a variety of geological environments; however, each specific carbonate mineralogy typically is limited to a narrow range of geologic settings in which it forms. Thermal infrared emission data to be received from the Mars Global Surveyor thermal emission spectrometer will contain the spectral signature of carbonates if they are present above the detectibility limit on the surface of Mars. This study presents the spectral information necessary to recognize carbonate as a mineral class as well as identify the specific type of carbonate from thermal emissivity data. Knowledge of distinct carbonate mineralogy will be useful for interpreting the environmental conditions that were present on Mars during the carbonate formation. The result of this study is that the major carbonate mineral species (calcite, dolomite, magnesite, siderite, and smithsonite) can be identified from thermal infrared emission data, provided moderate (10cm-1) spectral sampling. Because of the similarity of absorption band positions between kutnahorite and calcite, high (2cm-1) spectral sampling is required to distinguish kutnahorite. Moderate spectral sampling data are also sufficient to determine the amount of Mg and Fe in Mg-Fe solid solution minerals to within 3-5% of the cation abundance.
Christensen Phillip R.
Lane Melissa D.
No associations
LandOfFree
Thermal infrared emission spectroscopy of anhydrous carbonates does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Thermal infrared emission spectroscopy of anhydrous carbonates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal infrared emission spectroscopy of anhydrous carbonates will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-924128