Till A Glacial Process Sedimentology 1st Edition by David Evans ISBN 978-1118652596 1118652592
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Product details:
ISBN 10: 1118652592
ISBN 13: 978-1118652596
Author: David J. A. Evans
Provides the first comprehensive review of the current state of the science on tills
It is critical that glacial scientists continue to refine their interpretations of ancient archives of subglacial processes, specifically those represented by tills and associated deposits, as they form the most widespread and accessible record of processes at the ice-bed interface. Unfortunately, despite a long history of investigation and a lexicon of process-based nomenclature, glacial sedimentologists have yet to reach a consensus on diagnostic criteria for identifying till genesis in the geological record. What should be called till? Based on the author’s extensive field research, as well as the latest literature on the subject, this book attempts to provide a definitive answer to that question. It critically reviews the global till literature and experimental and laboratory-based assessments of subglacial processes, as well as the theoretical constructs that have emerged from process sedimentology over the past century. Drawing on a wide range of knowledge bases, David Evans develops a more precise, contemporary till nomenclature and new investigatory strategies for understanding a critical aspect of glacial process sedimentology.
- Provides an in-depth discussion of subglacial sedimentary processes, with an emphasis on the origins of till matrix and terminal grade and the latest observations on till evolution
- Describes contemporary laboratory and modelling experiments on till evolution and techniques for measuring strain signatures in glacial deposits
- Develops an updated till nomenclature based on an array of knowledge bases and describes new strategies for field description and analysis of glacial diamictons
Written by an internationally recognised expert in the field, this book represents an important step forward in the modern understanding of glacial process sedimentology. As such, Till: A Glacial Process Sedimentology is an indispensable resource for advanced undergraduates and researchers in sedimentology, glacier science and related areas.
Table of contents:
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Glacigenic Diamictons – A Rationale for Study
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A Brief History of Till Research and Developing Nomenclature
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Till – When is it an Inappropriate Term?
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Glacigenic Diamictons: A Strategy for Field Description and Analysis
4.1. Diamicton
4.2. (Glacigenic) Melange
4.3. Physics of Material Behaviour
4.4. Typical Structures
4.5. Clast Macrofabrics and Microfabrics -
Subglacial Sedimentary Processes: Origins of Till Matrix and Terminal Grade
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Subglacial Sedimentary Processes: Modern Observations on Till Evolution
6.1. Lodgement, Lee-Side Cavity Filling and Ploughing
6.2. Deformation
6.3. Soft-Bed Sliding (Ice Keel Ploughing), Meltwater Drainage and Ice–Bed Decoupling
6.4. Melt-Out
6.5. Glacitectonite Production, Rafting and Cannibalisation -
Subglacial Sedimentary Processes: Laboratory and Modelling Experiments on Till Evolution
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Measuring Strain Signatures in Glacial Deposits
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The Geological Record: Products of Lodgement, Cavity Fill and the Boulder Pavement Problem
9.1. Introduction – Repositioning Field Studies and Experimental Reductionism
9.2. Lodgement
9.3. Clast (Boulder) Pavements
9.4. Lee-side Cavity Fills -
The Geological Record: Deforming Bed Deposits
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The Geological Record: Sliding Bed Deposits
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The Geological Record: Impacts of Pressurised Water (Clastic Dykes)
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The Geological Record: Melt-out Till
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The Geological Record: Glacitectonite
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Glacial Diamictons Unrelated to Subglacial Processes
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Till Spatial Mosaics, Temporal Variability and Architecture
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Concluding Remarks: The Case for a Simplified Nomenclature
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