Results 231 to 240 of about 410,633 (280)

Accessory Minerals and δ18O and δ13C of Marbles From the Mediterranean Area

Journal of Cultural Heritage, 2004
Abstract Seventy-five samples of marbles from Italy, Greece, Turkey and Former Yugoslavia Republic of Macedonia (F.Y.R.O.M.) were investigated for the accessory minerals, never treated systematically before, and were studied also petrographically and analysed for C and O isotopes.
Adonis Photiades, Giampiero Venturelli
exaly   +3 more sources

The Heavy Accessory Minerals of the Val Verde Tonalite [PDF]

, 1936
The construction of the Metropolitan Water District Aqueduct for Los Angeles County, California has necessi­tated the drilling of long tunnels at various points en route from the Colorado River. One such tunnel situated near the town of Val Verde, California passes through some seven miles of tonalite.
Wilson, Robert Warren
openaire   +2 more sources

Occurrence and Geochemistry of Altered Radioactive Accessory Minerals as Sources of Radionuclide in Mesozoic Granite Aquifers (Korea)

Chemosphere
Accessory minerals in granitic rocks are unlikely significant radionuclide contributions to groundwater due to their remarkable durability. However, accessory minerals incorporating U and Th may suffer structural damages due to the radioactivity and ...
Jeong Hwang, Stefano Viaroli, Jin-Yong Lee   +2 more
exaly   +2 more sources

Trace Elements and Accessory Minerals in Lunar Samples

Science, 1970
Halogen contents similar to those in meteorites are reported in Apollo 11 samples. Concentrations of 0.6 to 13 parts mercury, 0.2 to 0.8 part uranium, 1 to 17 parts lithium, and 1 to 800 parts osmium per million and 0.5 to 1 percent chromium oxide by weight have been measured.
G W, Reed, S, Jovanovic, L H, Fuchs
openaire   +2 more sources

Water in Natural Mantle Minerals II: Olivine, Garnet and Accessory Minerals

Reviews in Mineralogy and Geochemistry, 2006
Hydrogen traces change the physical properties of mantle minerals to an extent that is far out of proportion to its low concentration. These properties include mechanical strength, melting behavior, diffusion rate, electrical conductivity, viscosity and rheology.
Beran, Anton, Libowitzky, Eugen
openaire   +1 more source

The paragenesis of accessory minerals

Economic Geology, 1956
Most of the common non-opaque accessory minerals (apatite, zircon, sphene) may be expected to crystallize late in igneous rocks since, other things being equal, constituents in small amount in a complex solution should crystallize late. This inference is confirmed by the association of these minerals with pegmatites, the presence of apatite and sphene ...
openaire   +1 more source

Role of accessory minerals on the vitrification of whiteware compositions

Ceramics International, 1990
Abstract Egyptian raw clays from South Sinai were substituted for two different English china clays in ceramic mixes. Standard mixes using only the English clays as well as mixes totally and partially substituted by the Egyptian clays were proposed. The contents of accessory minerals, namely quartz and micas, were taken into consideration.
N.M. Ghoneim, E.H. Sallam, D.M. Ebrahim
openaire   +1 more source

The heavier accessory minerals in the granites of Scotland

Transactions of the Edinburgh Geological Society, 1928
Early in 1915 a trial separation of the heavy minerals from a specimen of granite from one of the apophyses of the Benrinnes mass disclosed the presence of monazite, zircon, anatase, garnet, etc. Quite a number of crystals of monazite, some of them of considerable size, were found in the residue, and as only two occurrences of that mineral,1 so far as ...
openaire   +1 more source

The current state and future of accessory mineral research

Chemical Geology, 2002
Abstract Over the past decade, there have been many significant advances in the area of accessory minerals research, notably permitted by the development of imaging and in situ measurement techniques. In this paper, we review some recent developments and suggest areas on which to focus future research.
Poitrasson, Franck, Hanchar, John M., Schaltegger, Urs   +2 more
openaire   +2 more sources

Frequency Distributions in Accessory Mineral Analysis

The Journal of Geology, 1960
Counts to determine the frequency distributions of the occurrence of accessory heavy minerals in sediments may lead to binomial, Poisson, or negative binomial distributions; and conditions leading to those distributions are discussed. A set of data may be "fitted" to these model distributions, and the goodness of fit may be tested by chi-square.
openaire   +1 more source