Browsing by Author "Mason, Brian Harold, 1917-"
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Item The Chainpur meteorite. American Museum novitates ; no. 2173(New York, N.Y. : American Museum of Natural History, 1964) Keil, Klaus.; Mason, Brian Harold, 1917-; Wiik, H. B. (Hugo Birger); Fredriksson, Kurt.Item The chemical composition of olivine-bronzite and olivine-hypersthene chondrites. American Museum novitates ; no. 2223(New York, N.Y. : American Museum of Natural History, 1965) Mason, Brian Harold, 1917-Item The classification of chondritic meteorites. American Museum novitates ; no. 2085(New York, N.Y. : American Museum of Natural History, 1962) Mason, Brian Harold, 1917-"Prior's classification of the chondritic meteorites into enstatite, olivine-bronzite, and olivine-hypersthene chondrites is extended by the recognition of two more groups, the olivine-pigeonite and the carbonaceous chondrites. These groups are defined by chemical composition, most readily by the FeO/FeO+MgO mol per cent (in enstatite chondrites this is zero or near zero, olivine-bronzite chondrites 15-22, olivine-hypersthene chondrites 22-32, olivine-pigeonite chondrites 32-40, carbonaceous chondrites 40-50). However, the mineralogical composition is related to chemical composition, and the classification of an individual meteorite can be rapidly obtained by the presence or absence of olivine and its composition. The boundaries between different groups of chondrites are marked by hiatuses and discontinuities in chemistry and mineralogy, rather than continuous transitions. Meteorites belonging to different groups are notably unequal in abundance. Of more than 800 chondrites, nine are enstatite chondrites; 11, olivine-pigeonite chondrites; 14, carbonaceous chondrites; and the remainder, olivine-bronzite and olivine-hypersthene chondrites in approximately equal numbers. The chondrites as a whole show a uniformity of composition in terms of the non-volatile elements, except that the olivine-hypersthene chondrites contain about 5 per cent less iron than the other groups; they comprise Urey and Craig's low-iron type, whereas the other groups of chondrites belong to their high-iron type. The significance of these facts is discussed, and it is concluded that all chondritic meteorites were derived by processes of dehydration and reduction from a primary material similar in composition to the carbonaceous chondrites. The hiatuses and discontinuities between the different groups are ascribed to differences in the intensity of these processes and to a limited amount of chemical and phase differentiation"--P. 18.Item The composition of the Barrata, Carraweena, Kapoeta, Mooresfort, and Ngawi meteorites. American Museum novitates ; no. 2273(New York, N.Y. : American Museum of Natural History, 1966) Mason, Brian Harold, 1917-; Wiik, H. B. (Hugo Birger)Item The composition of the Bath, Frankfort, Kakangari, Rose City, and Tadjera meteorites. American Museum novitates ; no. 2272(New York, N.Y. : American Museum of Natural History, 1966) Mason, Brian Harold, 1917-; Wiik, H. B. (Hugo Birger)Item The composition of the Belly River, Bluff, Bremervörde, and Modoc meteorites. American Museum novitates ; no. 2280(New York, N.Y. : American Museum of Natural History, 1967) Mason, Brian Harold, 1917-; Wiik, H. B. (Hugo Birger)Item The composition of the Forest City, Tennasilm, Weston, and Geidam meteorites. American Museum novitates ; no. 2220(New York, N.Y. : American Museum of Natural History, 1965) Mason, Brian Harold, 1917-; Wiik, H. B. (Hugo Birger)Item The composition of the Ottawa, Chateau-Renard, Mocs, and New Concord meteorites. American Museum novitates ; no. 2069(New York, N.Y. : American Museum of Natural History, 1961) Mason, Brian Harold, 1917-; Wiik, H. B. (Hugo Birger)Item The composition of the Richardton, Estacado, and Knyahinya meteorites. American Museum novitates ; no. 2154(New York, N.Y. : American Museum of Natural History, 1963) Mason, Brian Harold, 1917-; Wiik, H. B. (Hugo Birger)Item Descriptions of two meteorites : Karoonda and Erakot. American Museum novitates ; no. 2115(New York, N.Y. : American Museum of Natural History, 1962) Mason, Brian Harold, 1917-; Wiik, H. B. (Hugo Birger)Item The hypersthene achondrites. American Museum novitates ; no. 2155(New York, N.Y. : American Museum of Natural History, 1963) Mason, Brian Harold, 1917-Item Metamorphic zones in the Southern Alps of New Zealand. American Museum novitates ; no. 1815(New York, N.Y. : American Museum of Natural History, 1956) Mason, Brian Harold, 1917-Item Metamorphism in the Southern Alps of New Zealand. Bulletin of the AMNH ; v. 123, article 4(New York : [American Museum of Natural History], 1962) Mason, Brian Harold, 1917-"The Southern Alps of New Zealand are a mountain range that forms the backbone of the South Island of New Zealand. The range extends in a northeast to southwest direction from about latitude 42 S. to latitude 45 S. and is continued both north and south by subsidiary ranges; it is bounded on the west by the Alpine Fault. Most of the rocks are graywackes and argillites and their metamorphosed equivalents. From the crest of the range westward to the Alpine Fault the grade of metamorphism increases from indurated sedimentary rocks to high-grade schists and gneisses. Four zones of progressive metamorphism are recognized: the Chlorite, Biotite, Almandine, and Oligoclase zones. The mineralogy and petrology of these zones are described and illustrated by analyses of their rocks and their constituent minerals. The sediments were deposited in a geosyncline in Triassic (and possible Permian and Jurassic) times. An early Cretaceous orogeny resulted in intense folding, followed by regional metamorphism. Erosion reduced the region to a low level by the end of the Cretaceous, and much of it was subjected to a marine transgression in early Tertiary times. Renewed uplift began in the Miocene and reached its peak in strong vertical movements on the Alpine Fault at the end of the Tertiary period"--P. 217.Item The meteorite and tektite collection of the American Museum of Natural History. American Museum novitates ; no. 2190(New York, N.Y. : American Museum of Natural History, 1964) Mason, Brian Harold, 1917-Item The pallasites. American Museum novitates ; no. 2163(New York, N.Y. : American Museum of Natural History, 1963) Mason, Brian Harold, 1917-Item The Renazzo meteorite. American Museum novitates ; no. 2106(New York, N.Y. : American Museum of Natural History, 1962) Mason, Brian Harold, 1917-; Wiik, H. B. (Hugo Birger)Item The Selma, Alabama, chondrite. American Museum novitates ; no. 2010(New York, N.Y. : American Museum of Natural History, 1960) Mason, Brian Harold, 1917-; Wiik, H. B. (Hugo Birger); Coleman, J. W.