Octahedral chemistry of 2:1 clay minerals and hydroxyl band position in the near-infrared: Application to Mars

2016 ◽  
Vol 101 (3) ◽  
pp. 554-563 ◽  
Author(s):  
Javier Cuadros ◽  
Joe R. Michalski ◽  
Vesselin Dekov ◽  
Janice L. Bishop
Keyword(s):  
Clay Minerals ◽  
Near Infrared ◽  
Band Position ◽  
Hydroxyl Band

Modification of kaolinite by controlled hydrothermal deuteration – a DRIFT spectroscopic study

Clay Minerals ◽  
2004 ◽  
Vol 39 (3) ◽  
pp. 349-362 ◽  
Author(s):  
Hui Ming
Keyword(s):  
Diffuse Reflectance ◽  
Near Infrared ◽  
Vibration Mode ◽  
Lattice Structure ◽  
Structural Defects ◽  
Hydroxyl Group ◽  
Isomorphous Substitution ◽  
Lattice Vibrations ◽  
Diffuse Reflectance Infrared ◽  
Hydroxyl Band

AbstractKaolinites were modified by controlled hydrothermal deuteration. Both infrared and near infrared vibration spectra of deuterated kaolinite were investigated by Diffuse Reflectance Infrared Fourier Transform spectroscopy. The stretching vibrations (v) of deuteroxyl groups of the kaolinite were observed at 2726, 2709, 2697 and 2667 cm-1, respectively. The overtone bands (2n) of the deuteroxyl groups were visible in NIR regions at 5454, 5419, 5388 and 5342 cm-1, respectively. The lattice vibrations of the kaolinite taking part in deuteration included 937, 915, 792, 751 and 690 cm-1 which are assigned to hydroxyl group-related deformation or translation-vibration mode. The hydroxyl band at 3435 cm-1 with its deuteroxyl band at 2542 cm-1 resulted from unevenly distributed structural defects, either due to the isomorphous substitution of foreign cations or the imperfections of the kaolinite lattice structure.

Spatial near-infrared imaging of hydroxyl band coverage on ceria-based catalysts

AIChE Journal ◽  
2006 ◽  
Vol 52 (4) ◽  
pp. 1516-1521 ◽  
Author(s):  
Farid Aiouache ◽  
Hiro Oyama ◽  
Kuniyuki Kitagawa
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Near Infrared Imaging ◽  
Hydroxyl Band

Near‐infrared detection of ammonium minerals

Geophysics ◽  
1987 ◽  
Vol 52 (7) ◽  
pp. 924-930 ◽  
Author(s):  
M. Dennis Krohn ◽  
Stephen P. Altaner
Keyword(s):  
Crystal Structure ◽  
Nitrogen Cycle ◽  
Near Infrared ◽  
Hot Spring ◽  
Ore Deposits ◽  
Infrared Detection ◽  
Spectral Features ◽  
Spectral Bands ◽  
Band Position ◽  
Infrared Spectral

Diagnostic near‐infrared spectral features have been identified for minerals with ammonium [Formula: see text] bound in the crystal structure. Spectral bands near 2.12, 2.02, and 1.56 μm are characteristic of synthetic and natural [Formula: see text] minerals. Laboratory spectra of [Formula: see text] minerals are distinct from spectra of OH‐bearing minerals and have diagnostic shifts in band position among different mineral types. [Formula: see text] minerals were detected at several mineralized hot‐spring deposits in the western U.S. by means of hand‐held and airborne instruments. Near‐infrared detection of [Formula: see text] minerals may provide useful information for prospecting for certain ore deposits and may provide a better understanding of the nitrogen cycle within geologic environments.

Near-infrared photoacoustic FTIR spectroscopy of clay minerals and coal

1986 ◽  
Vol 26 (3) ◽  
pp. 135-140 ◽  
Author(s):  
J.C. Donini ◽  
K.H. Michaelian
Keyword(s):  
Ftir Spectroscopy ◽  
Clay Minerals ◽  
Near Infrared

Near-infrared spectroscopy: A powerful tool in studies of acid-treated clay minerals

2009 ◽  
Vol 49 (2) ◽  
pp. 211-218 ◽  
Author(s):  
Jana Madejová ◽  
Martin Pentrák ◽  
Helena Pálková ◽  
Peter Komadel
Keyword(s):  
Infrared Spectroscopy ◽  
Clay Minerals ◽  
Near Infrared Spectroscopy ◽  
Near Infrared

The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy

Science ◽  
2019 ◽  
pp. eaav7432 ◽  
Author(s):  
K. Kitazato ◽  
R. E. Milliken ◽  
T. Iwata ◽  
M. Abe ◽  
M. Ohtake ◽  
...  
Keyword(s):  
Near Infrared ◽  
Surface Composition ◽  
Parent Body ◽  
Absorption Feature ◽  
Direct Measurements ◽  
Band Position ◽  
Infrared Spectrometer ◽  
Sample Return Mission ◽  
Near Infrared Spectrometer ◽  
Rubble Pile

The near-Earth asteroid 162173 Ryugu, the target of Hayabusa2 sample return mission, is thought to be a primitive carbonaceous object. We report reflectance spectra of Ryugu’s surface acquired with the Near Infrared Spectrometer (NIRS3) on Hayabusa2, to provide direct measurements of the surface composition and geological context for the returned samples. A weak, narrow absorption feature centered at 2.72 μm was detected across the entire observed surface, indicating that hydroxyl (OH)-bearing minerals are ubiquitous there. The intensity of the OH feature and low albedo are similar to thermally- and/or shock-metamorphosed carbonaceous chondrite meteorites. There are few variations in the OH-band position, consistent with Ryugu being a compositionally homogeneous rubble-pile object, generated from impact fragments of an undifferentiated aqueously altered parent body.

Near-Infrared Imaging Analysis of Cellulose Tablets by a Band Position Shift

2009 ◽  
Vol 63 (8) ◽  
pp. 974-977 ◽  
Author(s):  
Hideyuki Shinzawa ◽  
Kimie Awa ◽  
Yukihiro Ozaki ◽  
Hidetoshi Sato
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Imaging Analysis ◽  
Near Infrared Imaging ◽  
Band Position ◽  
Position Shift

scholarly journals Mineralogy and diagenesis of Mars-analog paleosols from eastern Oregon, USA

2021 ◽  
Author(s):  
Adrian Broz ◽  
Joanna Clark ◽  
Brad Sutter ◽  
Doug Ming ◽  
Valerie Tu ◽  
...  
Keyword(s):  
Clay Minerals ◽  
Near Infrared ◽  
Evolved Gas Analysis ◽  
Sedimentary Rocks ◽  
Gas Analysis ◽  
Buried Soils ◽  
Martian Surface ◽  
Geological Time ◽  
Diagenetic Alteration ◽  
Mars Analog

Ancient (4.1-3.7-billion-year-old) layered sedimentary rocks on Mars are rich in clay minerals which formed from aqueous alteration of the Martian surface. Many of these sedimentary rocks appear to be composed of vertical sequences of Fe/Mg clay minerals overlain by Al clay minerals that resemble paleosols (ancient, buried soils) from Earth. The types and properties of minerals in paleosols can be used to constrain the environmental conditions during formation to better understand weathering and diagenesis on Mars. This work examines the mineralogy and diagenetic alteration of volcaniclastic paleosols from the Eocene-Oligocene (43-28 Ma) Clarno and John Day Formations in eastern Oregon as a Mars-analog site. Here, paleosols rich in Al phyllosilicates and amorphous colloids overlie paleosols with Fe/Mg smectites that altogether span a sequence of ~500 individual profiles across hundreds of meters of vertical stratigraphy. Samples collected from three of these paleosol profiles were analyzed with visible/near-infrared (VNIR) spectroscopy, X-ray diffraction (XRD), and evolved gas analysis (EGA) configured to operate like the SAM-EGA instrument onboard Curiosity Mars Rover. Strongly crystalline Al/Fe dioctahedral phyllosilicates (montmorillonite and nontronite) were the major phases identified in all samples with all methods. Minor phases included the zeolite mineral clinoptilolite, as well as andesine, cristobalite, opal-CT and gypsum. Evolved H2O was detected in all samples and was consistent with adsorbed water and the dehydroxylation of a dioctahedral phyllosilicate, and differences in H2O evolutions between montmorillonite and nontronite were readily observable. Detections of hematite and zeolites suggested paleosols were affected by burial reddening and zeolitization, but absence of illite and chlorite suggest that potash metasomatism and other, more severe diagenetic alterations had not occurred. The high clay mineral content of the observed paleosols (up to 95 wt. %) may have minimized diagenetic alteration over geological time scales. Martian paleosols rich in Al and Fe smectites may have also resisted severe diagenetic alteration, which is favorable for future in-situ examination. Results from this work can help distinguish paleosols and weathering profiles from other types of sedimentary rocks in the geological record of Mars.

scholarly journals Estimation of the Relative Abundance of Quartz to Clay Minerals Using the Visible–Near-Infrared–Shortwave-Infrared Spectral Region

2021 ◽  
pp. 000370282199830
Author(s):  
Nicolas Francos ◽  
Gila Notesco ◽  
Eyal Ben-Dor
Keyword(s):  
Clay Minerals ◽  
Spectral Region ◽  
Near Infrared ◽  
Raw Materials ◽  
Gradient Boosting ◽  
Quartz Content ◽  
Spectral Identification ◽  
Optical Region ◽  
Infrared Spectral ◽  
Shortwave Infrared

Quartz is the most abundant mineral on the earth’s surface. It is spectrally active in the longwave infrared (LWIR) region with no significant spectral features in the optical domain, i.e., visible–near-infrared–shortwave-infrared (Vis–NIR–SWIR) region. Several space agencies are planning to mount optical image spectrometers in space, with one of their missions being to map raw materials. However, these sensors are active across the optical region, making the spectral identification of quartz mineral problematic. This study demonstrates that indirect relationships between the optical and LWIR regions (where quartz is spectrally dominant) can be used to assess quartz content spectrally using solely the optical region. To achieve this, we made use of the legacy Israeli soil spectral library, which characterizes arid and semiarid soils through comprehensive chemical and mineral analyses along with spectral measurements across the Vis–NIR–SWIR region (reflectance) and LWIR region (emissivity). Recently, a Soil Quartz Clay Mineral Index (SQCMI) was developed using mineral-related emissivity features to determine the content of quartz, relative to clay minerals, in the soil. The SQCMI was highly and significantly correlated with the Vis–NIR–SWIR spectral region (R2 = 0.82, root mean square error (RMSE) = 0.01, ratio of performance to deviation (RPD) = 2.34), whereas direct estimation of the quartz content using a gradient-boosting algorithm against the Vis–NIR–SWIR region provided poor results (R2 = 0.45, RMSE = 15.63, RPD = 1.32). Moreover, estimation of the SQCMI value was even more accurate when only the 2000–2450 nm spectral range (atmospheric window) was used (R2 = 0.9, RMSE = 0.005, RPD = 1.95). These results suggest that reflectance data across the 2000–2450 nm spectral region can be used to estimate quartz content, relative to clay minerals in the soil satisfactorily using hyperspectral remote sensing means.

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