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Journal Article
Published: 01 June 1984
Canadian Journal of Earth Sciences (1984) 21 (6): 694-697.
...Graham J. Borradaile; Don Tarling AbstractStrongly 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: Economic Geology
Published: 01 August 1980
Economic Geology (1980) 75 (5): 752-759.
...A. N. Halliday AbstractThe 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): 389-391.
Journal Article
Published: 01 February 1980
Clays and Clay Minerals (1980) 28 (1): 29-34.
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 AbstractRecently 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 40Ar/39Ar age spectrum is flat for 80% of the released Ar...
Journal Article
Published: 01 June 1979
American Mineralogist (1979) 64 (5-6): 514-518.
...R. J. Stull AbstractSynneusis, 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 AbstractTonalite 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...
Journal Article
Journal: Geology
Published: 01 May 1979
Geology (1979) 7 (5): 240-244.
... of these eruptions from the vertical size grading of feldspar phenocrysts near the base of deep-sea tephra layers. The size grading is a function of the release time of the particles, their settling velocity, the water depth at the site of the ash layer, and the duration of the eruption. The model has been tested...
Journal Article
Published: 01 January 1979
Bulletin de la Société Géologique de France (1979) S7-XXI (5): 631-641.
... fractional crystallization. GeoRef, Copyright 2011, American Geological Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom 1979 andesites basalts calc-alkalic composition chain silicates chemical composition electron probe data Erromanga feldspar...
Journal Article
Published: 01 December 1978
Journal of Sedimentary Research (1978) 48 (4): 1167-1176.
...) dissolution of calcite cement, feldspar grains and rock fragments, and finally e) cementation by Fe-calcite, ankerite and kaolinite. Isotopic analyses of the authigenic phases and formation water lead to the following conclusions. Chlorite formed during shallow burial soon after deposition when amorphous...
Journal Article
Published: 01 December 1978
Journal of Sedimentary Research (1978) 48 (4): 1185-1192.
...P. M. Shannon AbstractA petrographic analysis of Cambro-Ordovician sand- and silt-sized greywackes from south-east Ireland indicates that much of the matrix is secondary in origin. Detrital quartz, feldspar and rock fragments are observed to contribute to the matrix; the quartz by marginal...
Journal Article
Published: 01 December 1978
Journal of Sedimentary Research (1978) 48 (4): 1241-1248.
...D. F. Sibley; K. J. Pentony AbstractProvenance variations in turbidite deposits from DSDP Sites 299 and 301 in the Sea of Japan have been determined on the basis of petrographic and electron microprobe analyses of quartz and feldspar in the 34-74mu size interval. Site 299 receives most or all...
Journal Article
Published: 01 December 1978
Journal of Sedimentary Research (1978) 48 (4): 1311-1320.
... material of Sybille Creek, the Laramie River, and the North Platte and Platte Rivers consists of texturally submature, subquartzose sands with nearly equal amounts of feldspar and rock fragments. Within the Platte system, feldspar and granitoid rock fragments undergo more than 600 km of transport without...
Journal Article
Published: 01 August 1978
American Mineralogist (1978) 63 (7-8): 771-778.
Journal Article
Published: 01 June 1978
Journal of Sedimentary Research (1978) 48 (2): 385-388.
... clay mineral in the dust which also contained chlorite, kaolinite, quartz and feldspar. Most of the material was less than 2 mu in size. Based on these results it is concluded that atmospherically-transported materials represent an important contribution to presently accumulating North Atlantic...
Journal Article
Published: 01 June 1978
Journal of Sedimentary Research (1978) 48 (2): 427-432.
...R. G. Charles; H. Blatt AbstractTwenty interbedded fluvial muds and sands (mud-sand pairs) from various rivers in Oklahoma, Missouri, Arkansas, Louisiana, Mississippi and Texas were collected and analyzed. Chemical treatments were used to isolate the solid silica (quartz plus chert) and feldspar...
Journal Article
Published: 01 May 1978
The Canadian Mineralogist (1978) 16 (2): 223-237.
Journal Article
Published: 01 March 1978
Canadian Journal of Earth Sciences (1978) 15 (3): 464-465.
...J. Haynes; R. M. Quigley AbstractThis is the first reported occurrence of irregular particles consisting predominantly of framboidal pyrite, quartz and lesser feldspar in Champlain Sea clays in the Arnprior and Hawkesbury areas of Ontario. C'est la première fois qu'on rapporte des particules...