ALBERT

Anmerkung: Mit engl., franz. und russ. Zsfassungen

Anmerkung: Preface INTRODUCTION History of the Nazca Plate Project George P. Woollard and La Verne D. Kulm DIVERGENT BOUNDARY Tectonics of the Nazca-Pacific divergent plate boundary David K. Rea Structure and evolution of the Easter plate D. W. Handschumacher, R. H. Pilger, Jr., J. A. Foreman, and J. F. Camphell Petrogenesis and secondary alteration of upper layer 2 basalts of the Nazca plate K. F. Scheidegger and J. B. Corliss Temporal variations in secondary minerals from Nazca plate basalts, diabases, and microgabbros Debra S. Slakes and K. F. Scheidegger METALLIFEROUS SEDIMENTS Geochemistry of Nazca plate surface sediments: An evaluation of hydrothermal, biogenic, detrital, and hydrogenous sources Jack Dymond Metalliferous-sediment deposition in time and space: East Pacific Rise and Bauer Basin, northern Nazca plate G. Ross Heath and Jack Dymond Lead isotopic composition of metalliferous sediments from the Nazca plate E. Julius Dasch Sediment accumulation rate patterns on the northwest Nazca plate G. M. McMurtry. H. H. Veeh, and C. Moser Uranium and thorium isotopic investigations in metalliferous sediments of the northwestern Nazca plate H. Herbert Veeh Formation and growth of ferromanganese oxides on the Nazca plate Mitchell Lyle Sediment and associated structure of the northern Nazca plate D. L. Erlandson, D. M. Hussong, and J. F. Campbell Economic appraisal of Nazca plate metalliferous sediments Cvrus W. Field, Dennis G. Wetherell, and E. Julius Dasch CONTINENTAL MARGIN AND TRENCH Tectonics, structure, and sedimentary framework of the Peru-Chile Trench W. J. Schweller, L. D. Kulm, and R. A. Prince Coastal structure of the continental margin, northwest Peru and southwest Ecuador Glenn L. Shepherd and Ralph Moberly Sedimentary basins of the Peru continental margin: Structure, stratigraphy, and Cenozoic tectonics from 6°S to 16°S latitude T. Thornburg and L. D. Kulm Crustal structures of the Peru continental margin and adjacent Nazca plate, 9°S latitude Paul R. Jones III Crustal structure and tectonics of the central Peru continental margin and trench L. D. Kulm, R. A. Prince, W. French, S. Johnson, and A. Masias Late Cenozoic carbonates on the Peru continental margin: Lithostratigraphy, biostratigraphy, and tectonic history La Verne D. Kulm, Hans Schroder, Johanna M. Resig, Todd M. Thornburg, Antonio Masias, and Leonard Johnson Vertical movement and tectonic erosion of the continental wall of the Peru-Chile Trench near 1 l°30'S latitude Donald M. Hussong and Larry K. Wipperman Shallow structures of the Peru Margin 12°S - 18°S S. H. Johnson and G. E. Ness Clay mineralogy of the Peru continental margin and adjacent Nazca plate: Implications for provenance, sea level changes, and continental accretion Victor J. Rosato and La Verne D. Kulm Structures of the Nazca Ridge and continental shelf and slope of southern Peru Richard Couch and Robert M. Whitsett Tectonics of the Nazca plate and the continental margin of western South America, 18° to 23°S William T. Coulbourn Biogeography of benthic foraminifera of the northern Nazca plate and adjacent continental margin Johanna M. Resig Estimation of depth to magnetic source using maximum entropy power spectra, with application to the Peru-Chile Trench Richard J. Blakely and Siamak Hassanzadeh An active spreading center collides with a subduction zone: A geophysical survey of the Chile Margin triple junction E. M. Herron, S. C. Cande, and B. R. Hall Structures of the continental margin of Peru and Chile Richard Couch, Robert Whit sett, Bruce Huehn, and Luis Briceno-Guarupe ANDEAN CONVERGENCE ZONE Volcanic gaps and the consumption of aseismic ridges in South America Amos Nur and Zvi Ben-Avraham Geological and geophysical variations along the western margin of Chile near lat 33° to 36°S and their reaction to Nazca plate subduction Allen Lowrie and Richard Hey Chile Margin near lat 38°S: Evidence for a genetic relationship between continental and marine geologic features or a case of curious coincidences? E. M. Herron Convergence and mineralization — Is there a relation? C. Wayne Burnham Role of subducted continental material in the genesis of calc-alkaline volcanics of the central Andes David E. James Isotopic composition of Pb in Central Andean ore deposits George R. Tilt on, Robert J. Pollak, Alan H. Clark, and Ronald C. R. Robertson Epilogue: Geostill reconsidered Cyrus W. Field and E. Julius Dasch

Anmerkung: Kartenbeilage (Figure 1 : 1 of 12) unter dem Titel: Geophysical correlation between the geological zonation of Newfoundland and the British Isles : The geological zonation of Newfoundland and the British Isles and its offshore extension as defined geophysically (see text) /by R. T. Haworth and R. D. Jacobi , Kartenbeilage (Figure 2 : 2 of 12) unter dem Titel: Geophysical correlation between the geological zonation of Newfoundland and the British Isles : Compilation of magnetic anomaly data for the Canadian, British, Irish and French continental margins /by R. T. Haworth and R. D. Jacobi , Kartenbeilage (Figure 3 : 3 of 12) unter dem Titel: Geophysical correlation between the geological zonation of Newfoundland and the British Isles : Compilation of gravity anomaly data for the Canadian, British, Irish and French continental margins /by R. T. Haworth and R. D. Jacobi , Kartenbeilage (Figure 3 : 4 of 12) unter dem Titel: Crustal geometry of the Appalachian Orogen from seismic reflection studies : COCORP New England traverse Parts I and II /by Clifford J. Ando, Frederick A. Cook, Jack E. Oliver, Larry D. Brown, and Sidney Kaufman , Kartenbeilage (Figure 5 : 4 of 12) unter dem Titel: Crustal geometry of the Appalachian Orogen from seismic reflection studies : Québec seismic traverse 2001 /by Clifford J. Ando, Frederick A. Cook, Jack E. Oliver, Larry D. Brown, and Sidney Kaufman , Kartenbeilage (Figure 7 : 5 of 12) unter dem Titel: Crustal geometry of the Appalachian Orogen from seismic reflection studies : COCORP southern Appalachian traverse Part I /by Clifford J. Ando, Frederick A. Cook, Jack E. Oliver, Larry D. Brown, and Sidney Kaufman , Kartenbeilage (Figure 2 : 6 of 12) unter dem Titel: A deep structural profile across the Appalachians of southern Quebec : Geological map along the seismic line : compiled by P. St.-Julien and A. Slivitsky from maps by Clark and Globensky (1973), Muller (unpubl.), St--Julien (unpubl.), and Kelly (1975) /by Pierre St.-Julien, Anne Slivitsky, and Tomas Feininger , Kartenbeilage (Figure 3 : 6 of 12) unter dem Titel: A deep structural profile across the Appalachians of southern Quebec : Structural profile across the southwestern part of the Quebec Appalachians : Interpretation by P. St.-Julien, A. Slivitsky, and B. Granger, modified from an unpublished geophysical interpretation by SOQUIP /by Pierre St.-Julien, Anne Slivitsky, and Tomas Feininger , Kartenbeilage (Figure 4 : 7 of 12) unter dem Titel: A deep structural profile across the Appalachians of southern Quebec : Palinspastic section of the Cambrian-Ordovician units along the seismic line (modified from St-Julien and Hubert, 1975) /by Pierre St.-Julien, Anne Slivitsky, and Tomas Feininger , Kartenbeilage (Figure 5 : 7 of 12) unter dem Titel: A deep structural profile across the Appalachians of southern Quebec : Seismic profile 2001 (Quebec Department of Engery and Resources, DP665) /by Pierre St.-Julien, Anne Slivitsky, and Tomas Feininger , Kartenbeilage (Figure 1 : 8 of 12) unter dem Titel: Geologic interpretation of geophysical maps of the pre-cretaceous "basement" beneath the coastal plain of the southeastern United States : Aeromagnetic map of part of the southeastern Unites States (from Zietz and Gilbert, 1980) 〈1: 2000000〉 /by Michael W. Higgins and Isidore Zietz , Kartenbeilage (Figure 2 : 9 of 12) unter dem Titel: Geologic interpretation of geophysical maps of the pre-cretaceous "basement" beneath the coastal plain of the southeastern United States : Bouguer gravity map of part of the southeastern United States 〈1: 2000000〉 : compiled by David Daniels (personal communication) /by Michael W. Higgins and Isidore Zietz , Kartenbeilage (Figure 3 : 10 of 12) unter dem Titel: Geologic interpretation of geophysical maps of the pre-cretaceous "basement" beneath the coastal plain of the southeastern United States : Magnetic terranes of part of the southeastern United States 〈1: 2000000〉 /by Michael W. Higgins and Isidore Zietz , Kartenbeilage (Plate 1 : 11 of 12) unter dem Titel: An interpretation of the geology of the Mauritanides orogenic belt (West Africa) in the light of geophysical data : Geological map of the western margin of the West African craton (modified after Lécorché, 1980) /by J. P. Lécorché, J. Roussel, J. Sougy, and Z. Guetat , Kartenbeilage (Plate 2 : 12 of 12) unter dem Titel: An interpretation of the geology of the Mauritanides orogenic belt (West Africa) in the light of geophysical data : Bouguer gravity anomaly map (contour interval 5 mgal) of the western margin of the West African craton, also showing the principal geological subdivisions /by J. P. Lécorché, J. Roussel, J. Sougy, and Z. Guetat , Introduction (Robert D. Hatcher, Jr., Harold Williams, and Isidore Zietz) A new geophysical criterion to correlate the Acadian and Hercynian orogenies of western Europe and eastern Ameria (Jean-Pierre Lefort) A plate-tectonics model for the Paleozoic assembly of Pangea based on paleomagnetic data (Rob Van der Voo) Geophysical correlation between the geological zonation of Newfoundland and the British Isles (R. T. Haworth and R. D. Jacobi) Appalachian suspect terrones (Harold Williams and Robert D. Hatcher, Jr.) Exotic terranes in the New England Appalachians—limits, candidates, and ages: A speculative essay (E-an Zen) Crustal geometry of the Appalchian orogenfrom seismic reflection studies (Clifford J. Ando, Frederick A. Cook, Jack E. Oliver, Larry D. Brown, and Sidney Kaufman) A deep structural prof He across the Appalachians of southern Quebec (Pierre St.-Julien, Anne Slivitsky, and Thomas Feininger) Tectonic significance of paired gravity anomalies in the southern and central Appalachians (M. D. Thomas) Geologic interpretation of geophysical maps of the pre-Cretaceous "basement" beneath the Coastal Plain of the Southeastern United States (Michael W. Higgins and Isidore Zietz) An interpretation of the geology of the Mauritanides orogenic belt (West Africa) in the light of geophysical data (J. P. Lécorché, J. Roussel, J. Sougy, and Z. Guetat) Tectonic significance of similarities in the evolution of the Alabama-Pennsylvania Appalachians and the Alberta-British Columbia Canadian Cordillera (Raymond A. Price and Robert D. Hatcher, Jr.) The distribution of layer parallel shortening fabrics in the Appalachian foreland of New York and Pennsylvania: Evidence for two non-coaxial phases of the Alleghanian orogeny (Peter Geiser and Terry Engelder) Role of basement warps and faults in localizing thrust fault ramps (David Wiltschko and Daniel Eastman) Detachment, shear, and compression in the central Alps (H. P. Laubscher) Cover and basement: A contrast in style and fabrics (P. A. Rathbone, M. P. Coward, and A. L. Harris)

Anmerkung: Introduction / Charles E. Chapin and Wolfgang E. Elston References cited Ash-flow magmatism / Robert L. Smith Abstract Introduction Volumes of ash-flow sheets Size of magma chambers Zoned magma chambers Crater Lake, Oregon Bandelier Tuff, New Mexico SiO₂ and phenocryst variation in ash-flow sheets Periodicity-volume-composition relationships Discussion of model Summary and conclusions Acknowledgments References cited Cooling units and composite sheets in relation to caldera structure / Robert L. Christiansen Abstract Introduction Examples of ash-flow-caldera relations Mazama eruption and Crater Lake caldera Bandelier Tuff and Valles-Toledo calderas Thirsty Canyon Tuff and Black Mountain caldera Timber Mountain-Oasis Valley caldera complex Yellowstone Plateau volcanic field General pattern of ash-flow-caldera relations Acknowledgments References cited The Bishop Tuff: Evidence for the origin of compositional zonation in silicic magma chambers / Wes Hildreth Abstract Introduction Eruptive sequence Major units Units of uncertain correlation Summary of eruptive sequence Eruptive temperatures Accuracy and precision of T-fₒ₂ data Mineralogy Fe-Ti oxides Quartz Sanidine Plagioclase Biotite Pyroxenes Allanite Zircon Apatite Pyrrhotite Whole-rock chemistry Major elements Trace elements Compositional gaps Origin of the compositional zonation Crystal settling Assimilation Basaltic underplating Liquid immiscibility Progressive partial melting Trace elements during partial melting Convection-driven thermogravitational diffusion Lines of evidence Concluding remarks Acknowledgments References cited Rare-earth-element content of some highly differentiated ash-flow tuffs and lavas / Donald C. Noble, Ward L. Rigot, and Harry R. Bowman Abstract Introduction Specimens studied and methods of chemical analysis Results and discussion Acknowledgments References cited Geochemistry of the Los Chocoyos Ash, Quezaltenango Valley, Guatemala / William I. Rose, Jr., Norman K. Grant, and John Easter Abstract Introduction Field description Geochemistry Mineralogy and mineral chemistry Sr-isotope data Modeling of crystal fractionation Time required for crystal fractionation Conclusions Acknowledgments Appendix 1. Analytical methods References cited Geochemical correlation of genetically related rhyolitic ash-flow and air-fall ashes, central and western Guatemala and the equatorial Pacific / Gregory A. Hahn, William I. Rose, Jr., and Thomas Meyers Abstract Introduction Previous investigations of chemical fingerprinting The Los Chocoyos Ash and the stratigraphic sequence of the San Cristobal Group Characteristics of the ash-flow member Sample acquisition and preparation Trace-element analyses Chemical correlation Lateral chemical variations Source of the Los Chocoyos Ash Age of the Los Chocoyos Ash Conclusions Acknowledgments References cited Ignimbrites of the Sierra Madre Occidental and their relation to the tectonic history of western Mexico / Fred W. McDowell and Stephen E. Clabaugh Abstract Introduction Volcanic stratigraphy of the Sierra Madre Occidental Pre-Cretaceous volcanic rocks Lower volcanic complex Unconformity between the igneous sequences Upper volcanic supergroup Calderas of the upper volcanic supergroup Structure of the Sierra Madre Occidental Chemistry Tectonic relationships Acknowledgments References cited Emplacement of pyroclastic flows: A review / Michael F. Sheridan Abstract Introduction Eruptions Observed pyroclastic flows Theoretical eruption models Mobility Topographic barriers Energy line Deposits Morphology Depositional sequence Textures Large clasts Deflation Compositional variation Welded peralkaline ignimbrites Emplacement temperatures Models Fluidization Speculation Summary Acknowledgments References cited Primary and secondary flow structures in ash-flow tuffs of the Gribbles Run paleovalley, central Colorado / Charles E. Chapin and Gary R. Lowell Abstract Introduction Paleovalleys and the Wall Mountain Tuff Primary flow structures Gas cavities (lenticules) Lineation Foliation Primary folds Rotated lithic fragments Imbricated crystals Secondary now structures Secondary folds and growth faults Tension cracks Miscellaneous structures Steam spiracles Conclusions Acknowledgments References cited Welded air-fall tuffs / R.S.J. Sparks and J. V. Wright Abstract Introduction Field relationships Santorini, Greece The 1875 Askja welded tuffs, Iceland Other examples Petrology and chemistry Grain-size studies Santorini welded tuffs Askja welded tuff Compaction and welding Strain, bulk density, and porosity measurements Results for Santorini welded tuffs Results for Askja welded tuff Discussion Acknowledgments References cited Globule ignimbrite of Mount Suswa, Kenya / R. L. Hay, W. Hildreth, and R. N. Lambe Abstract Introduction Scope and purpose of study Geologic setting and previous work Description and field relationships Ignimbrite petrography Vitric materials Crystals and rock fragments Devitrification and gas-phase crystallization Low-temperature alteration Nature of lower ignimbrite sheet Nature of the magma Chemical composition Temperature and viscosity Emplacement of ignimbrite and origin of globules Acknowledgments References cited A model of pyroclastic surge / K. H. Wohletz and M. F. Sheridan Abstract Introduction Terminology Objectives and methods of study Deposits Bed forms Locations Results Pyroclastic-surge facies Discussion and conclusions Development of bed forms Reconstruction of the surge cloud A model of pyroclastic surge: Its fluidization and deflation Acknowledgments References cited Significance of the flattening of pumice fragments in ash-flow tuffs / Donald W. Peterson Abstract Introduction Pumice fragments in the Apache Leap Tuff Recognition and description of pumice fragments Flattening of the pumice Applications of the flattening studies Recognition of cooling units Implications of extreme flattening Determination of stratigraphic level and fault displacement Commercial application of flattening ratios Determination of the degree of welding Pumice flattening as a possible guide to relative temperature of emplacement and rate of accumulation Conclusions Acknowledgments References cited Ash-flow sheets and calderas: Their genetic relationship to ore deposits in Nevada / Edwin H. McKee Abstract Introduction Metal deposits in volcanic-tectonic systems Resurgent cauldrons Geologic setting Parameters of study Distribution of mines and ash-flow sheets Distribution of mines and calderas Discussion Acknowledgments References cited

Anmerkung: CONTENTS: Introduction. - Topography and hydrography. - Climate, glaciation, permafrost. - Notes on the scientific exploration of the area. - Sea level changes. - C-14 dates on shell material, corrections and errors. - Marine limits. - Emergence curves. - Marine faunas. - Glaciation history. - Pleistocene glaciation. - The Milne Land Moraines. - Glacial retreat, the Rødefjord stages. - Glacial readvance. - Climatic implications. - Comparison with other areas. - Pollen analytical investigations. - Field methods. - Lake sediments. - C-14 dates of lake sediments and rates of sedimentation. - Pollen preparation and calculation procedures. - Pollen identification. - Description of sites and pollen diagrams. - Notes on the present vegetation. - Discussion and reconstruction of vegetation types. - Plant immigration and climatic change. - Summary of the vegetation history. - Comparison with other areas. - General notes on the climatic development. - Acknowledgements. - References.