scholarly journals Geological classification of Canadian gold deposits

2000 ◽  
Author(s):  
K H Poulsen ◽  
F Robert ◽  
B Dubé
Keyword(s):  
Gold Deposits

Geology, distribution, and classification of gold deposits in the western Qinling belt, central China

2002 ◽  
Vol 37 (3-4) ◽  
pp. 352-377 ◽  
Author(s):  
Jingwen Mao ◽  
Yumin Qiu ◽  
Richard Goldfarb ◽  
Zhaochong Zhang ◽  
Steve Garwin ◽  
...  
Keyword(s):  
Gold Deposits ◽  
Central China ◽  
Western Qinling

A new classification of the gold deposits of Egypt

2004 ◽  
Vol 25 (1-2) ◽  
pp. 1-37 ◽  
Author(s):  
Nagy Shawky Botros
Keyword(s):  
Gold Deposits ◽  
New Classification

A practical classification of gold deposits, with a theoretical basis

2015 ◽  
Vol 65 ◽  
pp. 568-573 ◽  
Author(s):  
G. Neil Phillips ◽  
Roger Powell
Keyword(s):  
Theoretical Basis ◽  
Gold Deposits

Classification of pyrite types using fractal and stepwise factor analyses in the Chah Zard gold-silver epithermal deposit, Central Iran

2020 ◽  
Vol 20 (4) ◽  
pp. 496-508
Author(s):  
Hossein Kouhestani ◽  
Majid Ghaderi ◽  
Peyman Afzal ◽  
Khin Zaw
Keyword(s):  
Inductively Coupled Plasma ◽  
Gold Mineralization ◽  
Study Data ◽  
Gold Deposits ◽  
Central Iran ◽  
Factor Analyses ◽  
Icp Ms ◽  
Gold Silver ◽  
Log Ratio

The major target of this research is the classification of pyrite types using fractal and stepwise factor analyses in the Chah Zard ore deposit, Central Iran. The ore occurs within a breccia/vein type and the major ore mineral hosting gold mineralization is pyrite. In this study, data were selected using optical, scanning electron microscopy (SEM) and backscattered electron observations as well as laser ablation-inductively coupled plasma–mass spectrometry (LA-ICP–MS) analysis. Conventional interpretations represent four gold-bearing pyrite types of various textures including fractured and porous Py1, oscillatory-rimmed and simple-zoned Py2, colloform Py3 and inclusion-rich Py4. The stepwise factor process was performed on the centred log ratio (clr) transformed data in two phases and Au was grouped with As, Te, Ni and Co in the second factor from the second stage (F2-2). Also, C-N fractal modelling was performed on the As, Au, Te and F2-2 values, all of which demonstrate multifractal nature. Four populations were separated based on F2-2 values and the C-N log–log plot. The main gold mineralization starts from 32 ppm, 2.8%, 7.94 ppm and 1.26 for Au, As, Te concentrations and F2-2, respectively, based on the C-N fractal modelling. These values are correlated with inclusion-rich Py4 and simple-zoned and oscillatory-rimmed Py2. The results obtained in this study show that fractal interpretation of LA-ICP–MS data by stepwise factor analysis may provide a suitable tool for the recognition of ore mineralization in epithermal gold deposits.

GENETIC CLASSIFICATION OF ARCHEAN LODE GOLD DEPOSITS

2020 ◽  
pp. 11-21
Author(s):  
A. N. Glukhov
Keyword(s):  
Spatial Distribution ◽  
Gold Deposits ◽  
Canadian Shield ◽  
Genetic Classification ◽  
Lode Gold ◽  
Genetic Types ◽  
Tectonic Position ◽  
Lode Gold Deposits ◽  
Rock Lithology

Main features of the Archean gold deposits spatial distribution are outlined. Geology and ore composition of two deposits within the Canadian shield distinguished by tectonic position and host rock lithology are described. Delineation of two separate genetic types of the Archean gold deposits, orogenic and granitoid-related, similar to Phanerozoic accretion-collision belts is validated on that basis.

Note on the spectral classification of carbon stars in the photographic infrared region

1966 ◽  
Vol 24 ◽  
pp. 21-23
Author(s):  
Y. Fujita
Keyword(s):  
Infrared Region ◽  
Spectral Classification ◽  
Carbon Stars

We have investigated the spectrograms (dispersion: 8Å/mm) in the photographic infrared region fromλ7500 toλ9000 of some carbon stars obtained by the coudé spectrograph of the 74-inch reflector attached to the Okayama Astrophysical Observatory. The names of the stars investigated are listed in Table 1.

Diagnostic Value of Electron Microscopy in Soft Tissue Tumors

1970 ◽  
Vol 28 ◽  
pp. 220-221
Author(s):  
Gerald Fine ◽  
Azorides R. Morales
Keyword(s):  
Cardiac Myxoma ◽  
Osteogenic Sarcoma ◽  
Diagnostic Value ◽  
Soft Tissue Tumors ◽  
Amelanotic Melanoma ◽  
Growth Patterns ◽  
Light Microscopic Level ◽  
Mesenchymal Tumors ◽  
Good Agreement

For years the separation of carcinoma and sarcoma and the subclassification of sarcomas has been based on the appearance of the tumor cells and their microscopic growth pattern and information derived from certain histochemical and special stains. Although this method of study has produced good agreement among pathologists in the separation of carcinoma from sarcoma, it has given less uniform results in the subclassification of sarcomas. There remain examples of neoplasms of different histogenesis, the classification of which is questionable because of similar cytologic and growth patterns at the light microscopic level; i.e. amelanotic melanoma versus carcinoma and occasionally sarcoma, sarcomas with an epithelial pattern of growth simulating carcinoma, histologically similar mesenchymal tumors of different histogenesis (histiocytoma versus rhabdomyosarcoma, lytic osteogenic sarcoma versus rhabdomyosarcoma), and myxomatous mesenchymal tumors of diverse histogenesis (myxoid rhabdo and liposarcomas, cardiac myxoma, myxoid neurofibroma, etc.)

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