The composition of clay mineral has an important influence on the permeability coefficient k, the correct order of the permeability coefficients between the different mineral components is ___ A. kaolinite>illite>montmorillonite B. kaolinite<illite<montmorillonite C. illite>kaolinite>montmorillonite D. ka...
mineral composition / platinum-group elements / sulfide segregation / Wangjiangshan layered intrusion / northern margin of the Yangtze Block 0. 引言 镁铁—超镁铁质层状岩体主要由堆晶矿物组成,与堆晶矿物共存的熔体往往由于层状岩体的压实作用和成分对流作用被排出晶粥(crystal mush)而与堆晶矿物分离...
phase mineralephase organiquethe structure and composition of the mineral part, and the compositions of the organic matrices of various fossil bones have been studieddoi:info:doi/10.1016/S0753-3969(98)80006-2Yannicke DauphinAnnales de Paléontologie...
A fiberisable mineral composition which is thermostable and has a high dissolution rate in biological fluids and which consists essentially of 53.5 - 64 w/w % of SiO2, 4 w/w % of Al2O3, 10 - 20 w/w % of CaO, 10 - 20 w/w % of MgO, and 6.5 - 9 w/w % of FeO, the tot...
Structural complexity of ecosystems is a well-studied field in ecology. This important feature is mainly determined by abiotic characteristics (i.e. mineral composition, topography), biotic structures resulting from the activity of engineer organisms, and ecosystem age (Margalef, 1963, Loya, 1972, Jo...
There is another cluster of wulfenite off to the right and a smaller cluster off to the left for a great composition. The crystals are all very thick and juicy, with a unique robustness only seen in a few old finds from the 1930s and before. All the crystals are perched on a piece ...
organo–mineral assemblage (Fig.1b). Despite the potentially critical role of interactions between OM forms in shifting the current view of the spatial arrangement of SOM accumulation on mineral surfaces, the chemical composition of these interfaces has not been directly visualized or described in ...
Decomposition of soil organic matter (SOM) can be stimulated by fresh organic matter input, a phenomenon known as the ‘priming effect’. Despite its global importance, the relationship of the priming effect to mineral weathering and nutrient release rem
In this work we studied the chemical composition of a dry, black powder found in a bronze inkwell of the first century AD. According to a stylistic study of the inkwell and its attested use during the Roman period9,10, we assumed the powder to be an ink. The importance of the present...
摘要: Carbonatites host some of the largest and highest grade rare earth element (REE) deposits but the composition and source of their REE-mineralising fluids remains enigmatic. Using C, O and 87Sr/86Sr...关键词: Carbonatites Rare earth elements C and O isotopes Sr isotopes Chilwa Alkaline...