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By National Research Council, Division on Engineering and Physical Sciences, Mathematics, and Applications Commission on Physical Sciences, Ocean Studies Board, Continental Margins Committee
Nearly 70 consistent with cent of the world's inhabitants is focused within the coastal borderlands, which geologists realize to be the current continental margins. This new booklet on those continental margins offers a close account of a gathering, which introduced jointly experts in marine and terrestrial geology, geochemistry, and geophysics. The workshop garnered common help and exuberance for a brand new path in margins examine occupied with interdisciplinary reports of the elemental methods of continental margin evolution. clinical difficulties and ideas have been pointed out for either divergent and convergent margins. result of the workshop express that the various primary plate interplay procedures are universal to all margins, even if shaped via extension, contraction, or translation. This end indicates a unified method of margins study. A margins initiative has been proposed to stick with up at the workshop effects via constructing technological know-how courses geared toward figuring out the methods that keep watch over the initiation and evolution of continental margins.
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Extra resources for Margins: A Research Initiative for Interdisciplinary Studies of the Processes Attending Lithospheric Extension and Convergence
Example text
BARRY RALEIGH CHAIRMAN Page ix CONTENTS Part I: Report of the Continental Margins Workshop 1 Executive Summary 3 1 Introduction 8 Impetus For The Workshop, 8 Organization And Support Of The Workshop, 9 Charges To The Working Groups, 10 2 Results Of The Workshop 12 Margin Processes: A New Rationale For Research Into Lithospheric Convergence And Divergence, 12 Future Directions For Research On Margin Processes: Requirements For Success, 19 3 Components Of A Margins Initiative 24 A New Approach For Margins Research, 24 A Margins Initiative Committee, 25 Planning Workshops, 25 Drafting A Scientific Plan, 25 Part II: Reports of the Working Groups 27 4 Passive Margins: Group 1 Mechanics Of Rifting And Associated Magmatism 29 Preamble, 29 The Single Most Important Scientific Objective, 33 Needed Studies, 35 5 Passive Margins: Group 2 Rift And Passive Margin BasinsThe Sedimentary Record 45 Preamble, 45 Background, 46 The Single Most Importance Scientific Objective, 48 Needed Studies, 53 Strategies Required To Achieve The Goals, 59 Page X 6 Passive Margins: Group 3 Divergent Continental MarginsPost-Rifting Internal Processes Summary, 61 Background, 62 The Single Most Important Scientific Objective, 64 Needed Studies, 78 Strategy Required to Achieve Goals, 71 Broader Implications, 71 Selected Bibliography, 72 7 Active Margins: Group 1 Dynamics of Short-Term Deformation at Active Margins 73 The Single Most Important Scientific Objective, 73 Three Major Areas for Investigation, 73 Needed Studies, 78 8 Active Margins: Group 2 Geologic Evolution of Active Continental Margins 85 The Single Most Important Scientific Objective, 85 Needed Studies, 91 9 Active Margins: Group 3 Mass and Chemical Transfer 95 Introduction, 95 Critical Problems, 97 Needed Studies, 105 10 Supplementary Note on Rock Mechanics Problems at Active Margins 109 Part III: Background Papers 113 Appendix: List of Participants 277 Page 1 PART I REPORT OF THE CONTINENTAL MARGINS WORKSHOP Page 3 Executive Summary Overview The geology of continents is to a large degree the geology of continental margins.
Once a melt is generated, water influences the petrologic evolution of the melt, and the development of major ore deposits (porphyry copper, molybdenum, and gold). Fluid pressures also influence seismicity. Subducted fluids clearly affect, and perhaps even control, the tectonics at convergent margins. Fluids also play an important role in the accretionary prism. Overpressured fluids are probably required to reduce the sediment shear strength sufficiently to maintain the shape of the accretionary prism.
Studies of trace element and isotope systematics in igneous rocks have produced a set of tools for monitoring the fluxes of mantle, crust, and sediment at volcanic arcs and at magmatically active rifts. 7. Advances in the understanding of continental margin depositional systems and the formation of large-scale stratigraphy sequences now allow us to extract from the stratigraphic record a detailed history of past climate and tectonism. These advances have led us to the brink of a new era in our understanding of continental margins.