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| 1, 1976 Revised version received May 25, 1976 Island arc and continental margin (i.e. western Americas)...chemistry and mineralogy between continental margin and island arc lavas, although small consistent differences...Central, and South Americas) and those o f the island arc systems o f the northern and western Pacific...Clearly, an important distinction of the orogenic basalt-andesite type (which may well have genetic significance)...classification used for the statistics compiled: Basalt: Absence of Ca-poor pyroxene as a phenocryst, mic'rophenocryst |
 | | Journal (article/letter/editorial) |
| Mineralogy and Geochemistry of the Younger Volcanic Islands of Tonga, S.W. Pacific by A. EWART, W. B. BRYAN...Tongan Islands comprise a double island chain, and lie at the northern end of an active island arc extending...extending NNE from northern New Zealand. The eastern chain are limestone covered, with an underlying pre-Upper...pre-Upper Eocene gabbro-basalt-andesite series exposed on one island. The active volcanoes, the subject...subject of this paper, form the western island chain, and lie some 100 km above a westward dipping seismic |
 | | Journal (article/letter/editorial) |
| Geological Sciences, State University of New York at Albany, Albany, New York 12222 CLASSIFICATION OF BASALTS...provinces have a volcanic rock series starting from basalt, as shown for example in Figure 1. Other provinces...lower in FeO (and FeO*), as is represented by the basalt-andesite-dacite-rhyolite series in orogenic belts...ASHIRO continents, e.g. the Palisade sill in New Jersey and New York (Walker 1940, Walker 1969) and the Stillwater...the ca1c alkalic series (Bowen trend) and the tholeiitic series (Fenner trend). The main constituent minerals |
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| view the evolution of the Caledonian orogen in a new light, volcanite petrochemistry has directed attention...will tend to displace the rock toward the alkali basalt field in the alkali-silica diagram and toward the...and tholeiitic fields from Miyashiro (1975). Trend lines: A abyssal tholeiites; M Macauley Island (Kermadec...analyses cluster across the boundary between these two basalt types. Ti-Zr-Sr plots (Fig. 5) confirm the chemical...plot along or to the left of the ocean-floor tholeiitic field boundary are probably depleted in Sr by |
 | | Journal (article/letter/editorial) |
| Northern Marianas: Implications for the Origin of Island Arc Basalts T.H. Dixon t and R. Batiza 2 t GeologicalResearch...volcanically active islands in the northern Marianas group, an intra-oceanic island arc. The data include...determinations (87Sr/S6Sr=0.7034_+0.0001). Quartz-normative basalt and basaltic andesite are the most abundant lava...intra-oceanic islands arcs. It is suggested, however, that they are not typical of the 'island arc tholeiitic'...suggest a purely mantle origin for the Marianas island arc basalts, with negligible input from subducted |
 | | Book |
| With 109 Figures Springer-Verlag Berlin Heidelberg New York 1981 Professor JAMES B. GILL University of...which "solves the andesite problem" and even though new ideas and data keep the issues in a state of flux...sense I began this book in 1966 to 1968 when, as a new graduate student attending AGU meetings in Washington...andesites increase across island arcs. By temperament VI Preface and age I prefer new explanations to conventional...Andesites Primary Melts of Subducted Ocean Floor Basalt? No . . . . . . . . . . . . . . .. The Sediment |
 | | Book |
| SCIENTIFIC PUBLISHING COMPANY AMSTERDAM - OXFORD - NEW YORK 1979 ELSEVIER SCIENTIFIC PUBLISHING COMPANY...ELSEVIER/NORTH-HOLLAND INC. 52, Vanderbilt Avenue New York, N.Y. 10017 Library of Congress Cataloging...character are found in: (4) subvolcanic regions of island arcs; and (5) ophiolites. The spatial relations...of Rio Brazos and Twilight Gneiss of Colorado and New Mexico (Barker et al., 1976; Barker and Mil lard...type; e.g., the lowAlpOo trondhjemite of Rio Brazos, New Mexico (Barker et al., 1976), shows as much as 5 |
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| NORTH ISLAND NEW ZEALAND Poor Kn1ght1 Is • . ,, r ,n H~n & C h1ck...Rivt~r I'. MY OF East C,pe Pf.NEW PLYMO • Cil.pe Eimo C • Portl.lfld I MY Secretar)'... ' r \ rr " WART ISLAND f Pq,1 Pt., 1~s II t I SOUTH ISLAND NEW ZEALAND +I s University College...' _____ TELE - . _, • The Geology of New Zealand Volume 2 •• J-----~---.. ~ ::,,::::j::~....Associate Editors: G. R. Stevens, M. T. Te Punga New Zealand Geological Survey, Department of Scientific and |
 | | Book (volume) |
| NORTH ISLAND NEW ZEALAND Poor Kn1ght1 Is • . ,, r ,n H~n & C h1ck...Rivt~r I'. MY OF East C,pe Pf.NEW PLYMO • Cil.pe Eimo C • Portl.lfld I MY Secretar)'... ' r \ rr " WART ISLAND f Pq,1 Pt., 1~s II t I SOUTH ISLAND NEW ZEALAND +I s University College...' _____ TELE - . _, • The Geology of New Zealand Volume 2 •• J-----~---.. ~ ::,,::::j::~....Associate Editors: G. R. Stevens, M. T. Te Punga New Zealand Geological Survey, Department of Scientific and |
 | | Report (issue) |
| 25 30 31 ILLUSTRATIONS Page FIGURE 1. Map of New England and Maritime Provinces showing Silurian and...compared with data of McDougall for the Columbia River Basalt Group . . . . . . . . . . . . . . . . . . . . ...along the coasts of southern New Brunswick, Canada, and southeastern New England in the United States...contains typically nonporphyritic high-alumina tholeiitic basalts, basaltic andesites, and diabase of continental...subaerial Lower Devonian Eastport Formation, contains tholeiitic basalts and basaltic andesites, typically with |
 | | Report (chapter) |
| in Laurentia and to the E in Baltica. Ensimatic island arcs developed locally in late Cambrian and early...Hudson River Valley Middle Atlantic U.S. Eastern New York and western Massachusetts Northeastern U.S...Submarine calc-alkaline and oceanic tho lei it e basalt lavas and intrusives, possibly trench-related,...{Strong, 19/4a) J / Ocean ridge oph)o~ite (Bay of Islands Com.)~'((Malpas, 1977; Suenn et e l . , 1979; Jacobsen...1982) Fragmented ophlolite (Serpentinite of Staten Island) (see Fisher et e l . , 1970) Oceanic ridge ophiolite |
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| PUB LlSH I NG COMPANY 1982 Amsterdam - Oxford - New York ELSEVIER SCIENTIFIC PUBLISHING COMPANY 1,...SCIENCE PUBLISHING COMPANY INC. 52, Vanderbilt Avenue New York. N.Y. 10017 Library of Congresb Cataloging...during the process of gathering the data together, new information has been added in order t o further increment...deep-seated processes involved in the creation of new crust. Only a few segments of oceanic ridges have...of the Rivera and Tamayo Fracture Zones) provided new structural and petrological data for the understanding |
