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Publications (15)
Shortwave infrared (SWIR) spectroscopy can be applied directly to analyze the mineral chemistry of raw or geologic materials. It provides diagnostic spectral characteristics of the chemical composition of minerals, information that is invaluable for the identification and quality control of such materials. The present study aims to investigate the...
This paper shows the results of Short-Wavelength Infrared (SWIR) spectroscopy investigations of volcanic rocks sampled from low-grade metamorphic greenstone belts of the Archean Pilbara Craton in Western Australia. From the reflectance spectra a range of spectrally active minerals were identified, including chlorites, hornblende, actinolite, epidot...
Visible and near infrared reflectance (VNIR; 350–2500 nm) spectroscopy has greatly been used in soils, especially for studying variability in spectrally active soil components (e.g., organic carbon, clays, and Fe/Al oxides) based on their diagnostic spectral features. In recent years, this technique has also been applied to assess soil metallic ion...
ABSTRACT
Silver nanoparticles (AgNPs) were synthesized with lecithin through a simple chemical reduction method. The prepared AgNPs/lecithin was then loaded into the wool fabric by exhaustion and pad-dry-cure methods. The surface morphology of the loaded wool fabrics was characterized by low-voltage scanning electron microscopy, and the loading eff...
The presence of hydrocarbon seeps at the surface is indirect evidence of the presence of mature source rocks within a geological system at depth. Chemical changes in the environment of surface rocks caused by hydrocarbon seeps cause mineralogical alterations. To determine the nature of the alterations and the influences of lithology and type of see...
Acid mine drainage (AMD) is one of the major environmental problems in coalmining districts. The present study explores the potential of high-resolution satellite (HRS) imagery, combined with field-based geochemical sampling, for investigating the AMD-related issues arising from artisanal coal mining activity in a part of North-Eastern India. The H...
In this article we describe a new instrumental setup at the University of Twente Faculty ITC with an optimized processing chain to measure absolute directional-hemispherical reflectance values of typical earth science samples in the 2.5 to 16 μm range. A Bruker Vertex 70 FTIR spectrometer was chosen as the base instrument. It was modified with an e...
High concentrations of fluoride (F–) in drinking water are harmful to human health. Knowledge of spatiotemporal distribution of F– content in groundwater is thus a prerequisite for taking preventive measures. This communication reports F– incidence in groundwater and its relation with the prevalence of fluorosis in Tamnar area, Raigarh District, Ch...
The aim of this study is to derive parameters from spectral variations associated with heavy metals in soil and to explore the possibility of extending the use of these parameters to hyperspectral images and to map the distribution of areas affected by heavy metals on HyMAP data. Variations in the spectral absorption features of lattice OH and oxyg...
The Abor volcanic rocks. exposed in the Siang window, NE Himalaya. occur as dismembered thrust-hound packages interbanded with fossiliferous shelf sediments of Upper Palaeocenc to Middle Eocene age. Their age is broadly contemporaneous with the age of collision between the Indian and Tibetan continents. They were. therefore, erupted in a convergent...
The Archaean Eastern Indian Craton consists of several granitoid batholiths intruding greenstone-like sequences. The Bonai pluton, one such body in the central sector of the craton, consists of a dominant porphyritic and a subordinate equigranular variety ranging in composition from trondhjemite to granite. Xenoliths of massive trondhjemite, migmat...
Upper Mesozoic to lower Eocene ophiolitic rocks occur in two parallel belts along the eastern margin of the Indian plate. The eastern belt passes through central Burma, Sumatra, and Java, and coincides with a zone of gravity highs resulting from steeply dipping mafic rocks. It denotes the locus of the subduction where these ophiolites were accreted...
The results are briefly described of a test of stream-sediment sampling for scheelite as a pathfinder to gold. Evidence for rock crushing on outcrop by ancient gold miners is also noted and illustrated.-G.J.N.
