sample is a serpentine conglomerate in a carbonate matrix. A) False color image highlighting spectral diversity; polygons define the regions averaged for endmember spectra. B) Result of minimum distance supervised classification in ENVI. C) Averaged endmember spectra from (A), with USGS reference spectra. IDENTIFICATION AND QUANTIFICATION OF MINERAL ABUNDANCE FROM VSWIR REFLECTANCE SPECTRA IN C...

Human-induced ocean acidification and warming alter seawater carbonate chemistry reducing the calcification of reef-building crustose coralline algae (CCA), which has implications for reef stability. However, due to the presence of multiple carbonate minerals with different solubilities in seawater, the algal mineralogical responses to changes in carbonate chemistry are poorly understood. Here ...

Soil degradation, including rocky desertification, of the karst regions in China is severe. Karst landscapes are especially sensitive to soil degradation as carbonate rocks are nutrient-poor and easily eroded. Understanding the balance between soil formation and soil erosion is critical for long-term soil sustainability, yet little is known about the initial soil forming processes on karst terr...

The main source of calcium carbonate (CaCO₃) in the ocean comes from the shells of calcifying planktonic organisms, but substantial amounts of CaCO₃ are also produced in fish intestines. The precipitation of CaCO₃ assists fish in intestinal water absorption and aids in whole body Ca²⁺ homeostasis. Here we report that the product formed in the intestinal lumen of the gilt-head seabream, Sparus a...

Surface complexation models (SCMs) provide a mechanistic and thermodynamicallybased description of sorption reactions on mineral surfaces and can thus be used in geochemical modelling to predict contaminant sorption under a variety of geochemical conditions. In the last years, substantial effort has been put into obtaining multiple lines of evidence for the types of complexes formed on mineral ...

Introduction: Fluid inclusions are micron-scale volumes of fluid entrapped during the precipitation of minerals. Fluids are entrapped during primary mineral growth, and during healing of later fractures. The water in fluid inclusions in minerals precipitated in the upper crust of Mars contains a record of the ambient environment during precipitation. This includes data on fluid temperature and ...

OBJECTIVE To determine the mineral composition of calculi, anatomic locations of the calculi, and findings of urinalysis and bacteriologic culture of urine and calculi in guinea pigs with urolithiasis. DESIGN Cross-sectional study. ANIMALS 127 guinea pigs. PROCEDURES Records of urinary calculi that had been submitted to the University of California Stone Laboratory from 1985 through 2003 ...

Mineral deposits related to thermal springs are generally of the carbonate or silicate precipitation types. Numerous thermal waters have been studied worldwide for their extensive deposits (Italy, Iceland, New Zealand, USA). The occurrence of other deposit types, such as oxides, associated with hydrothennal activity are few. However, the almost pure manganese oxide deposit in Japan was recently...

A new six-channel aircraft multispectral scanner has been developed to exploit mineral signature information at wavelengths between 8 and 12 micrometers. Preliminary results show that igneous rock units can be identified from their free silica content, and that carbonate as well as clay-bearing units are readily separable on the digitally processed images.

for obtaining reservoir petrophysical properties, for example porosity, non-destructive methods such as x-ray computed tomography, ct, seems to be precise and accurate. porosity is deducted from the ct image with a single scan via different techniques, such as pore space detection by image segmentation techniques then correlation with porosity. more than one hundred samples with carbonate litho...