+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Problems concerning the identification of basic volcanics

, : Problems concerning the identification of basic volcanics. Annales de la Societe Geologique de Belgique 90(7-10): 771-778

Two types of measurements are utilized in identifying fine-grained volcanic rocks: determinations of the mode, or observed mineral composition; and determinations of the norm, or calculated mineral composition. Measurements of the mode using polished thin sections and both reflected and transmitted light are recommended. They give considerably more accurate results than point counts of thin sections using transmitted light only. A new method of calculating the norm, the calculation of the stable mineral association, which is corrected for the actual chemical composition of each category of volcanics, gives better results than the C.I.P.W. classification. Norms calculated by the method of stable mineral association give results in very close agreement with modes derived from point counts using reflected and transmitted light.


Other references

Bushardt, R.L.; Flores, M., 2012: Leadership case study: Martha Flores, PA-C. Jaapa 25(8): 53-54

Würger, A., 2002: Persistent tunneling currents and magnetic-field effects in glasses. Recent experiments on insulating glasses showed an unexpected variation of the dielectric constant with a static magnetic field and, in particular, oscillations with an apparent flux quantum of about 10(-5)h/e. We propose an explanation for these...

Denisenko O.N.; Kozlov V.S., 1988: Guarantee of radiation therapy quality review of the literature. Meditsinskaya Radiologiya 33(9): 78-86

Adam L., 1986: Descriptions of two new species of the genus sphaenognathus buquet 1838 coleoptera lucanidae. Two new Sphaenognathus species are described from South America: Sphaenognathus bidentatus sp. nov. from Chile and Sphaenognathus villosus sp. nov. from Colombia.

Baillie, J., 2012: Considering the 'known unknowns'. Speaking at a recent IHEEM seminar focusing on some of the key water hygiene and safety, and waterborne infection prevention issues, facing healthcare estates/ engineering personnel responsible for 'large, complex' water systems, Dr Nick...

Gadd, J., 1971: Theres room for mock meat. Pig farming: 19 (8) 41

Buranaprapuk, A.; Malaikaew, Y.; Svasti, J.; Kumar, C.V., 2008: Chiral protein scissors activated by light: recognition and protein photocleavage by a new pyrenyl probe. Strong chiral discrimination and site-selective photocleavage of two model proteins, lysozyme and bovine serum albumin (BSA), by new pyrenyl probes are reported here. The enantiomeric pyrenyl probes D-phenylalanine-1(1-pyrene)methylamide (PMA- D-P...

Nicodemou Lena, E.; Kumagai, C.; Kitagawa, Y., 1997: Immunochemical evidence for laminin-like molecule on the surface of human natural killer cells. Funatsu, K [Editor], Shirai, Y [Editor], Matsushita, T [Editor] Animal Cell Technology : 387-390

Krugel, L.K.; Biele, G.; Mohr, P.N.C.; Li, S-Chen.; Heekeren, H.R., 2009: Genetic variation in dopaminergic neuromodulation influences the ability to rapidly and flexibly adapt decisions. The ability to rapidly and flexibly adapt decisions to available rewards is crucial for survival in dynamic environments. Reward-based decisions are guided by reward expectations that are updated based on prediction errors, and processing of these...

D'Amato, G.; Lobietti, A.; Mandrioli, P.; Moro, A.; Spediacci, C.; Tursi, A., 1988: The spectrum of allergenic pollens in Italy. A computerized method of aerobiological monitoring. The monitoring of airborne pollens that provoke allergy is of interest to clinicians to enable them to correlate chronologically the relationship between pollen concentrations in the atmosphere and the symptoms of patients with pollen-related alle...