Palaeosurfaces: Recognition, Reconstruction and Paleoenvironmental Interpretation

Palaeosurfaces: Recognition, Reconstruction and Paleoenvironmental Interpretation

Publisher: Geological Society of London ISBN: 1897799578 edition 1997 PDF 300 pages 32,7 mb

Palaeosurfaces is an area where geologists and geomorphologists can combine their expertise to provide a more holistic treatment of the processes that helped shape the face of the Earth. This volume presents a cross-disciplinary study of the evolution, reconstruction and palaeoenvironmental interpretation of ancient palaeosurfaces. Topics include palaeoenvironmental studies involving lateritization and bauxitization, palaeokarstification, geochemistry of rock alteration and the identification of ancient palaeosurface elements in both glaciated and tropical terrains.

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Mechanisms of Activity & Unrest at Large Calderas - Special Publication no 269

Mechanisms of Activity & Unrest at Large Calderas - Special Publication no 269

Publisher: Geological Society of London ISBN: 1862392110 edition 2006 PDF 208 pages 58,3 mb

Large caldera collapses represent catastrophic natural events, second only to large meteoritic impacts. In addition, some calderas are densely populated, making the risk extreme, even for moderate eruptions. Understanding caldera mechanisms, unrest and the danger of eruption is therefore a crucial challenge for Earth sciences. Several key features of caldera behaviour have yet to be fully understood. Through a combination of case studies and theoretical modelling, the following topics are addressed in this volume: the conditions required to produce and to release large volumes of magma erupted during caldera formation; how magmatic feeding systems evolve before and after a caldera has formed; the processes that limit the behaviour of precursors to eruptions; how pre-eruptive precursors can be distinguished from those that drive unrest without an eruption; and given that post-collapse eruptions may occur across a wide area, the optimum procedures for designing hazard maps and mitigation strategies.

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Metasomatism in Oceanic & Continental Lithospheric Mantle - Special Publication no 293

Metasomatism in Oceanic & Continental Lithospheric Mantle - Special Publication no 293

Publisher: Geological Society Of London ISBN: 1862392420 edition 2008 PDF 368 pages 8,9 mb

Twenty years have passed since Menzies & Hawkesworth extended the concept of metasomatism to mantle processes. The aim of this book is to gather together progress made on this topic since then. Most of the 14 papers reported in the volume rely on in situ major and trace element analyses of minerals and glasses in mantle xenoliths, and deal with different kinds of metasomatic agents at variable fluid/rock ratios in tectonic settings as different as intra-plate, mid-ocean ridge (ophiolites) and supra-subduction. The book contributes to the wide debate on the nature of the fluids migrating into the mantle wedge, as well as on the different residential times of the subduction signature. In addition papers on intra-plate settings deal with the problem of relating various metasomatic signatures to one single metasomatic event through an infiltration-reaction process.

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Tectonics of Strike-Slip Restraining and Releasing Bends - Special Publication no 290

Tectonics of Strike-Slip Restraining and Releasing Bends - Special Publication no 290

Publisher: Geological Society of London ISBN: 1862392382 edition 2008 PDF 488 pages 20,4 mb

Restraining and releasing bends are common, but enigmatic features of strike-slip fault systems occurring in all crustal environments and at regional to microscopic scales of observation. Regional-scale restraining bends are sites of mountain building, transpressional deformation and basement exhumation, whereas releasing bends are sites of topographic subsidence, transtensional deformation, basin sedimentation and possible volcanism and economic mineralization. Because restraining and releasing bends often occur as singular self-contained domains of complex deformation, they are appealing natural laboratories for Earth scientists to study fault processes, earthquake seismology, active faulting and sedimentation, fault and fluid-flow relationships, links between tectonics and topography, tectonic and erosional controls on exhumation, and tectonic geomorphology.

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