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Gy's formula

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Journal Article
Published: 01 April 1998
Exploration and Mining Geology (1998) 7 (1-2): 149–154.
Journal Article
Published: 01 January 2003
American Mineralogist (2003) 88 (1): 159–166.
... the temperature range 94 to 573 K. High-resolution transmission electron microscopy revealed that amorphous domains formed locally, concurrently with a gradual disordering of the entire structure. Amorphization doses at room temperature were 1.1 × 10 10 Gy for uranophane, 1.3 × 10 10 Gy for Sr-substituted...
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Journal Article
Published: 01 February 2017
Mineralogical Magazine (2017) 81 (1): 155–166.
... of absorptions of H 2 O molecules and OH − ions. The chemical composition (electron microprobe data, the hydrogen was calculated from the structural formula, wt.%) is C 20.33, N 31.11, O 28.34, Cu 17.27, Zn 0.24, H 2.82, total 100.11. The empirical formula is Cu 0.96 Zn 0.01 N 7.84 C 5.98 O 6.25 H 9.96...
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Journal Article
Published: 01 January 2008
American Mineralogist (2008) 93 (1): 241–247.
.... Complete amorphization was achieved at doses of 1.1 × 10 14 and 1.8 × 10 14 Gy at temperatures of 298 and 573 K, respectively. Electron energy-loss spectroscopy (EELS) of the Cs M -edge revealed the selective loss of Cs at the maximum doses. Hollandite irradiated using gamma rays, ~10 6 Gy, which has...
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Journal Article
Published: 01 October 2016
American Mineralogist (2016) 101 (10): 2347–2350.
...William E. Glassley; John A. Korstgård; Kai Sørensen Abstract Clusters of aligned, highly elongate, prismatic quartz (Qtz) rods occur in a few fayalite (Fa) crystals in an eulysite from a recently identified ~1.8 Gy UHP site in central West Greenland ( Glassley et al. 2014 ). Additional detailed...
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Journal Article
Published: 01 November 2004
American Mineralogist (2004) 89 (11-12): 1610–1616.
... and exhibit Fe 3+ /ΣFe values >0.5. The critical fluence for radiation damage by 100 kV electrons as defined by Fe 3+ /ΣFe <0.5 for cronstedtite at 300 K, is 1 × 10 4 e/Å 2 . The absorbed dose to the speciman during acquisition of a typical EELS spectrum is large, with values around 2.2 × 10 10 Gy (J...
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Journal Article
Published: 01 December 2016
Bulletin de la Société Géologique de France (2016) 187 (6): 245–260.
... at the m.y. timescale. Continents did not emerge before 3 Gy ago, thus excluding the weathering of their surfaces and the transport of alkali and calc-alkali elements by the rivers to the oceans. The only available sources, albeit to a limited extent, were possibly volcanic islands. As sodium is the main...
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Journal Article
Journal: Geophysics
Published: 01 January 2000
Geophysics (2000) 65 (1): 167–175.
... of the model. Suppose a point scatterer is embedded in an homogeneous medium with velocity v , and the recording line lengths in the x and y directions are L gx and L gy , respectively. Similar to equation ( 6 ), the ZO migration formula for 3-D is given by (19) where k = ω/v...
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Journal Article
Published: 01 June 2004
Mineralogical Magazine (2004) 68 (3): 489–497.
...-crandallite and svanbergite SrAl 3 PO 4 SO 4 (OH) 6 in the beudantite group. Comparatively high contents of Fe and Si and a very high positive Th and Fe content correlation (r = +0.98) suggest that the formula of the hypothetical Th-bearing end-member is ThFe 3 (PO 4 ,SiO 4 ) 2 (OH) 6 with Th and Si...
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Journal Article
Published: 01 July 2018
European Journal of Mineralogy (2018) 30 (4): 733–746.
... and carbonates, both calcite and dolomite, but also feldspar, illite, smectite, and sepiolite have been identified. The structural formulae obtained show great variability between samples, as well as with respect to the theoretical formula for palygorskite, as they range from magnesian to aluminous palygorskites...
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Journal Article
Published: 01 January 2007
Exploration and Mining Geology (2007) 16 (1-2): 109–123.
... size and sampling variance. To date, no proof exists of this sample size–sampling variance relationship in real geological materials exhibiting variations in grain size, shape, composition, and degree of liberation. Using first principles calculus and the formula for the mean, sample mass and sampling...
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Series: Society of Exploration Geophysicists, Society of Exploration Geophysicists
Published: 01 January 2017
EISBN: 9781560803423
... their relationship to the acquisition geometry. This work gives a comprehensive asymptotic analysis of the model resolution function for least-squares migration, with resulting formulae that allow the geoscientist to optimize resolution characteristics in full-waveform inversion, least-squares migration, and reverse...
Journal Article
Published: 16 May 2017
Geochemistry: Exploration, Environment, Analysis (2017) 17 (2): 63–91.
... information necessary to conduct such a classification includes only knowledge of chemical formulae of the ‘essential’ mineral assemblage. Essential minerals are, here, considered those minerals having concentrations exceeding 5% in 5% of the rocks under consideration. This criterion allows...
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Journal Article
Journal: Geophysics
Published: 01 January 2001
Geophysics (2001) 66 (2): 693–694.
... to a fixed source and receiver distribution, such as the one performed by Morey and Schuster (1999) in their 3-D imaging experiment. However, Tabti et al.'s request for the moving array formula is excellent, so the derivation is given below for a moving receiver array. For a moving receiver area...
Journal Article
Published: 01 May 2003
Geochemistry: Exploration, Environment, Analysis (2003) 3 (2): 169–178.
... to the demonstration of Gy's formula . Exploration and Mining Geology , 7 1998 . 149 – 154 . Gy , P. The sampling of broken ores; a review of principle and practice . Geological, Mining and Metallurgical Sampling. Transactions, Section B: Applied Earth Sciences 1974 . 194 – 205 Institution...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 2018
AAPG Bulletin (2018) 102 (5): 913–938.
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Journal Article
Journal: Economic Geology
Published: 01 January 2000
Economic Geology (2000) 95 (1): 249–254.
... 129 NUGGET: PC software to calculate parameters for samples and elements affected by the nugget effect— C.R. Stanley 139 Extensions to the demonstration of Gy’s formula— D. Fran çois-Bongarçon 149 Gold analysis–fire assaying and alternative methods— E.L. Hoffman, J.R. Clark, and J.R...
Journal Article
Journal: Geosphere
Published: 01 February 2011
Geosphere (2011) 7 (1): 54–61.
... an acceptable estimation of the general rock properties, the samples to be analyzed should be representative of the rock body itself, including its normal spatial variations. Theoretically, a sample is only representative when its analysis results are both accurate and reproducible ( Gy, 1994 ). Sampling...
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Journal Article
Published: 01 February 2009
American Mineralogist (2009) 94 (2-3): 313–322.
... ion activity product ( IAP ) is the product of the activities of the reacting ions powered to their stoichiometric number in the solid formula, K sp (thermodynamic solubility product) is the value of IAP at thermodynamic equilibrium, and Ω = IAP / K sp the saturation state...
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Journal Article
Journal: Geophysics
Published: 17 October 2000
Geophysics (2001) 66 (2): 521–526.
... by a polygonal facet at the origin, using the scheme given by Guptasarma and Singh (1999) . As written, grvmag3d.m computes the cardinal components of the magnetic (Hx, Hy, and Hz), and the gravity (Gx, Gy, and Gz) fields over a rectangular array of stations along one or more north–south profiles...
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