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feldspar

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Journal Article
Published: 01 January 1992
Reviews in Mineralogy and Geochemistry (1992) 27 (1): 37–84.
Journal Article
Journal: AAPG Bulletin
Published: 01 February 1985
AAPG Bulletin (1985) 69 (2): 288.
...K. L. Milliken; P. B. Gold; L. S. Land ABSTRACT Alteration of feldspars in the youngest of the Gulf Coast Cenozoic sands and sandstones is dominated by dissolution and albitization. Volumetrically significant amounts of alteration are only observed below burial depths of about 4.5 km in sands...
Journal Article
Published: 01 June 1984
Canadian Journal of Earth Sciences (1984) 21 (6): 694–697.
...Graham J. Borradaile; Don Tarling Abstract Strongly deformed Archean sandstones and conglomerates in northwestern Ontario show extreme heterogeneity of strain, with pebbles deformed more than feldspar grains, which are more deformed than quartz grains. Despite the heterogeneous changes of shape...
Journal Article
Published: 01 June 1981
Journal of the Geological Society (1981) 138 (3): 289–305.
... the presence of >3 m of crystal mush. The Klokken Laminated Syenites are slightly more fractionated than Nunarssuit and approach the water-rich termination of fractionation of olivine, clinopyroxene and ternary feldspar. Cumulus phases in Nunarssuit layers are chemically less fractionated than those...
Journal Article
Journal: Clay Minerals
Published: 01 September 1980
Clay Minerals (1980) 15 (3): 263–274.
Journal Article
Journal: Economic Geology
Published: 01 August 1980
Economic Geology (1980) 75 (5): 752–759.
...A. N. Halliday Abstract The exact timing of main stage mineralization in southwest England has never been certain. K-Ar ages for micas and feldspars from a metallized pegmatite are discordant but suggest formation at about 285 m.y. The K-Ar ages of micas from greisens are also discordant...
Journal Article
Journal: GSA Bulletin
Published: 01 July 1980
GSA Bulletin (1980) 91 (7_Part_II): 1669–1741.
... and deformation has caused complete recrystallization of the feldspars in parts of the granite. Some of this metamorphism occurred during Permian time, but the effects of earlier episodes cannot be evaluated. Geologic Setting We have studied the Scituate Granite Gneiss (SGG), Hope Valley Alaskite Gneiss (HVA...
Journal Article
Journal: GSA Bulletin
Published: 01 July 1980
GSA Bulletin (1980) 91 (7): 389–391.
Journal Article
Published: 01 June 1980
American Mineralogist (1980) 65 (5-6): 472–476.
...K. Viswanathan; K. Brandt Abstract The crystal structure of a monoclinic ternary barium feldspar with the formula ( Ba 0.19 K 0.59 Na 0.22 ) ( Si 2.82 Al 1.13 Fe 0.05 3 + ) O 8 [ a = 8.516 ( 1 ) , b = 13.023 ( 2 ) , c = 7.206 ( 1 ) Å , β = 115.90 ( 5 ) ∘ ] , space group C 2/ m has been refined to R...
Journal Article
Published: 01 June 1980
Clays and Clay Minerals (1980) 28 (3): 173–178.
Journal Article
Journal: AAPG Bulletin
Published: 01 May 1980
AAPG Bulletin (1980) 64 (5): 691.
Journal Article
Journal: AAPG Bulletin
Published: 01 May 1980
AAPG Bulletin (1980) 64 (5): 691.
...Asru K. Chaudhuri ABSTRACT Extensive glauconitization of feldspar grains exists in arkosic sedimentary rocks of a middle Proterozoic carbonate tidal-flat sequence in the Godavari valley, south India. Glauconitized sedimentary rocks occur as (1) well-defined thick layers, (2) small lenses...
Journal Article
Journal: Economic Geology
Published: 01 May 1980
Economic Geology (1980) 75 (3): 410–423.
... as: main magmatic, late magmatic, early post-magmatic, and late post-magmatic. Main magmatic stage microveins contain minerals in equilibrium with fractionated intergranular melt existing at this stage of release from the crystal-melt parent system. The assemblage typically will be quartz, K-feldspar...
Journal Article
Published: 01 February 1980
Clays and Clay Minerals (1980) 28 (1): 29–34.
Journal Article
Published: 01 February 1980
The Canadian Mineralogist (1980) 18 (1): 71–72.
Journal Article
Journal: GSA Bulletin
Published: 01 February 1980
GSA Bulletin (1980) 91 (2): 110–113.
...STEVEN R. BOHLEN; ERIC J. ESSENE; KAREN S. HOFFMAN Abstract Recently obtained feldspar and oxide temperature data for orthogneiss and paragneiss in the Adirondack Mountains, New York, further constrain and generally support the regional thermometry previously established. Peak metamorphic...
Journal Article
Published: 01 October 1979
Canadian Journal of Earth Sciences (1979) 16 (10): 1933–1941.
... antipole represents a late Proterozoic remagnetization. We chose biotite and K-feldspars from the available cores — biotite to record high temperature events and K-feldspars to detect any weak late Proterozoic reheating event. The biotite 40 Ar/ 39 Ar age spectrum is flat for 80% of the released Ar...
Journal Article
Published: 01 August 1979
The Canadian Mineralogist (1979) 17 (3): 515–525.
Journal Article
Published: 01 June 1979
American Mineralogist (1979) 64 (5-6): 514–518.
...R. J. Stull Abstract Synneusis, the drifting together and systematic attachment of crystals in a melt, is involved in three of the known origins for mantled feldspars: (1) overgrowth, (2) exsolution, and (3) filling of skeletal plagioclase. Quartz latite dikes of the Chocolate Mountains, California...
Journal Article
Journal: Geology
Published: 01 June 1979
Geology (1979) 7 (6): 278–280.
...George P. Rodgers; Heinrich D. Holland Abstract Tonalite cobbles from moraines in the Tobacco Root Mountains, Montana, have weathering rinds in which the feldspars are altered to clays along microcracks. Energy-dispersive X-ray and X-ray diffraction analyses have shown that microcracks...