P. A. Floyd

Oceanic Basalts

• Gebundenes Buch

Produktbeschreibung

I Structure.- 1 Introduction and the ophiolite model.- 1.1 Historical perspectives.- 1.2 Oceanic lithospheric processes.- 1.3 Concluding statements.- 2 Surveying and sampling the ocean floor.- 2.1 Introduction.- 2.2 Surveying the ocean floor.- 2.3 Acoustic systems.- 2.3.1 Multibeam swath bathymetric systems.- 2.3.2 Signal amplitude measurements: side-scan sonar.- 2.4 Deep-sea photography.- 2.5 Geological information from bathymetric mapping: Chile TripLe Junction region.- 2.6 Selecting sampling targets.- 2.7 Sampling methods.- 2.7.1 Dredging.- 2.7.2 Coring.- 2.7.3 Drilling.- 2.7.4 Submersible sampling.- 2.8 Concluding statements.- 3 Structure of the oceanic crust from geophysical measurements.- 3.1 Introduction.- 3.2 Ocean basins.- 3.3 Normal oceanic crust.- 3.4 Spreading centres.- 3.5 Fracture zone structure.- 3.6 Oceanic islands and swells.- 3.7 Concluding statements.- 4 Structure of the oceanic crust as deduced from ophiolites.- 4.1 Introduction.- 4.2 Alpine-type peridotites: variants and nomenclature.- 4.3 Seismic comparisons between oceanic crust and mantle.- 4.4 Implications for magmatic processes occurring at oceanic ridges.- 4.5 Implications for metamorphic processes occurring in the oceanic crust.- 4.6 Concluding statements.- II Processes.- 5 Mineralogy and crystallization of oceanic basalts.- 5.1 Introduction.- 5.2 Quench textures: the consequences of supercooling.- 5.3 Primary mineralogical controls on fractionation pathways of abyssal tholeiites.- 5.3.1 General course of fractionation in abyssal tholeiites: influence of magma chamber mixing.- 5.3.2 Advanced differentiation.- 5.3.3 Role of oxygen fugacity and oxide minerals.- 5.3.4 Apatite and sulphides.- 5.4 Liquid immiscibility and the significance of melt densities.- 5.5 Mantle-crust environments controlling oxygen fugacity.- 5.6 Alkalic magmatic lineages on seamounts.- 5.7 Concluding statements.- 6 Experimental phase petrology of mid-ocean ridge basalts.- 6.1 Introduction.- 6.2 Experimental studies at 1 atm.- 6.2.1 Experimental techniques.- 6.2.2 Results from experimental studies of basalts at 1 atm.- 6.2.3 Poorly known aspects of low pressure crystallization.- 6.2.4 Extreme differentiation of MORBs at low pressure.- 6.3 Experimental studies at high pressure.- 6.3.1 Experimental techniques.- 6.3.2 Results from experimental studies at high pressure.- 6.3.3 Poorly known aspects of high pressure equilibria relevant to MORBs.- 6.4 Concluding statements.- 7 Magmatic processes in oceanic ridge and intraplate settings.- 7.1 Introduction.- 7.2 Compositional diversity of oceanic magmas.- 7.2.1 Mid-ocean ridge basalt.- 7.2.2 Oceanic island basalt.- 7.3 Phase equilibrium and fluid dynamic constraints.- 7.3.1 Phase equilibria.- 7.3.2 Fluid dynamics.- 7.4 Melt generation: active versus passive.- 7.4.1 Passive melting at 'normal' ridge systems.- 7.4.2 OIB shields: rising mantle jets versus shear melting.- 7.5 Melt transport and storage in the oceanic lithosphere.- 7.5.1 Fractionation mechanisms.- 7.5.2 Mid-ocean ridge fractionation models.- 7.5.3 Intraplate fractionation models.- 7.6 Concluding statements.- 8 Metamorphic and hydrothermal processes: basalt-seawater interactions.- 8.1 Introduction.- 8.1.1 Importance of seawater-rock interactions.- 8.1.2 Controls of seawater-rock interactions.- 8.1.3 Effects of seawater-rock interactions.- 8.2 Low temperature alteration.- 8.2.1 Dredged basalts.- 8.2.2 Drilled basalts.- 8.3 High temperature reactions.- 8.3.1 Dredged basalts.- 8.3.2 Experimental evidence.- 8.3.3 Ophiolite evidence.- 8.3.4 Drilled basalts.- 8.4 Concluding statements.- III Environments.- 9 Oceanic islands and seamounts.- 9.1 Introduction.- 9.2 Hypotheses of intraplate volcanism.- 9.2.1 Mantle plume model.- 9.2.2 Propagating fracture model.- 9.3 Seamount distribution and morphology.- 9.4 Internal structure and composition.- 9.5 Basalt types.- 9.6 Geochemical features.- 9.6.1 Incompatible element abundances.- 9.6.2 Rare earth elements.- 9.6.3 Highly incompatible el...

Produktdetails

• Verlag: Springer Netherlands
• 1991.
• Seitenzahl: 476
• Erscheinungstermin: 30. September 1991
• Englisch
• Abmessung: 235mm x 157mm x 31mm
• Gewicht: 783g
• ISBN-13: 9780216926974
• ISBN-10: 0216926971
• Artikelnr.: 24505659

Inhaltsangabe

I Structure.- 1 Introduction and the ophiolite model.- 2 Surveying and sampling the ocean floor.- 3 Structure of the oceanic crust from geophysical measurements.- 4 Structure of the oceanic crust as deduced from ophiolites.- II Processes.- 5 Mineralogy and crystallization of oceanic basalts.- 6 Experimental phase petrology of mid-ocean ridge basalts.- 7 Magmatic processes in oceanic ridge and intraplate settings.- 8 Metamorphic and hydrothermal processes: basalt-seawater interactions.- III Environments.- 9 Oceanic islands and seamounts.- 10 Back-arc basins.- 11 Pacific ocean crust.- 12 Indian ocean crust.- 13 North Atlantic ocean crust and Iceland.- IV Sources.- 14 Stable and noble gas isotopes.- 15 Oceanic peridotites.- Appendix A Maps showing the geographical location of features mentioned in the text.- Appendix B Abundance of the elements in the earth and mean carbonaceous chondrite, C1.- Appendix C Isotopic ratios commonly used in magmatic petrogenesis.- Appendix D Normalization factors for rare earth elements and incompatible elements used in the construction of multi-element diagrams.- References.

Rezensionen

...an excellent reference source and it will be used for both final-year undergraduates and researchers working in the field. - Scientific Drilling; ...this new book is particularly welcome. Peter Floyd has an imaginative group of authors of varying interest and experience.... abundant discussion of novel ideas and there are many references to recent work.. - Terra Books; ...a useful review and handbook - Chemical Geology