Augite

The Hishikari Upper Andesites overlying the Hishikari Lower Andesites and the Shishimano Dacites consist of hypersthene-augite andesite lava flows and their pyroclastic rocks. [Pg.185]

Brophy JG, Whittington CS, Park Y-R (1999) Sector-zoned augite megaciysts in Aleutian high alumina basalts implications for the conditions of basalt crystallization and the generation of calc-alkaline series magmas. Contrib Mineral Petrol 135 277-290... [Pg.304]

Auger electron spectroscopy (AES), 76 495 24 84-87, 94-97. See also AES instrumentation archaeological materials, 5 744 quantitative, 24 98 Auger sensitivity factors, 24 96 Auger spectra, 24 95-97, 98 Auger transitions, 24 95 Augite, in coal, 6 718 Au(III) halides, 72 706. See also Gold(III) entries... [Pg.79]

Shimizu, N. (1981). Trace-element incorporation into growing augite phenocryst. Nature,... [Pg.535]

As reported by White and Yee (1985) structural Fe(II) at the surface of hornblende or augite is oxidized faster by 02 than Fe(Il) in solution at pH < 5 i.e., Fe(II) bound to silicates is kinetically a better reducing agent than Fe2+ in solution. The reader is referred to White (1990) for an excellent treatment of heterogeneous reactions with Fe(II)-minerals. [Pg.328]

The first extensive study of iron-silicate minerals published was by deCoster and co-workers (7, 24). Their results are summarized in Table VI. Augite is a pyroxene containing considerable Na and Ca. No iron percentage was given for the olivine studies. The other minerals are included for comparison. The values given here for biotite are averages for their three untreated samples, which have two sites described as distorted octahedra. Heat treatment at 700°C. for one hour resulted in the emergence of a new Fe peak in biotite. [Pg.72]

Mineral Bronzite Augite Augite Olivine Epidote Tourmaline Staurolite Actinolite Biotite, site 1 Biotite, site 2... [Pg.73]

Augite (Ca,Mg,Fe,Al)2(Si,Al)206 Basalts, andesites, tephrites, limburgites gabbros, dolerites, ultramafic rocks. Sometimes in granites... [Pg.270]

Table 5.32 Compositions (in weight %) of natural pyroxenes (samples 1-5 from Deer et al., 1983 samples 6 and 7 from Bonatti et al., 1986) (1) enstatite from a pyroxenite (2) ferrosilite from a thermometamorphic iron band (3) hedembergite (4) chromian augite from a gabbroic rock of the Bushveld complex (5) aegirine from a riebeckite-albite granitoid (6) diopside from a mantle peridotite (7) enstatite from a mantle peridotite. ...

Figure 5,25 Phase stability relations for natural pyroxenes in the quadrilateral. (A) Magmatic pyroxenes (not reequilibrated at low 7). (B) Three-phase region for pyroxenes of stratihed complexes and magmatic series. (C) Pyroxenes reequilibrated in subsolidus conditions. = Pbca orthopyroxene V = augite C2lc) A = pigeonite (P2jlc) 0 = olivine. From Huebner (1982). Reprinted with permission of The Mineralogical Society of America.

Table 5.62 Chemical analyses of some natural feldspars (Deer et al., 1983). (1) orthoclase (Mogok, Burma) (2) Adularia (St. Gottard, Switzerland) (3) anorthoclase inclusion in augite (Euganean Hills NE Italy) (4) sanidine from a nepheline-leucitite (5) albite from a pegmatite (6) anorthite from a calc-silicatic rock. ...

Figure 10.6 Onuma diagrams for crystal/melt trace element distributions. Ionic radii of Whittaker and Muntus (1970). (A) Augite/matrix distribution, data of Onuma et al.

Davoli P. (1987). A crystal chemical study of aegirin-augites and some evaluations on the oxidation state of Mn. Neues Jahrb. Miner. Abh., 158 67-87. [Pg.826]

Morimoto N. and Tokonami M. (1969). Oriented exsolution of augite in pigeonite. Amer. Mineral, 54 1101-1117. [Pg.844]

Ross M. and Huebner J. S. (1975). A pyroxene geothermometer based on composition temperature relationship of naturally occurring orthopyroxene, pigeonite and augite. In International Conference on Geothermometry and Geobarometry, The Pennsylvania State University. [Pg.851]

Plutonic rocks from the Emerald Lake pluton, Yukon, comprise four phases (/) augite syenite, (//) hornblende quartz... [Pg.323]

Lithogeochemical classification of these same rocks was undertaken to provide an alternative classification. This was done using three different essential mineral suites (with different C and T matrices) because (a) the augite syenite contains... [Pg.323]

Augite, Mossbauer spectrum of, 6 474 Au(PRj) fragment, addition to homonuclear gold cluster compounds, 39 329-332 Auranofin, 36 21 cytotoxicity, 36 22, 34 Auro-bis(thiosulfate), 36 18-19 Aurosomes, gold in, 36 21-22 Aurothioglucose, 36 18-19 Aurothiomalate, 36 18-21... [Pg.17]

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