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Geological Society of London Handbook Series Edited by Keith Cox Founded in 1807, the Geological Society of London has been publishing since 1845 and now distributes its journal to Fellows throughout the world. This Handbook is published as part of a series of authoritative practical guides to field geology. The Field Description of Metamorphic Rocks This handbook describes how metamorphic rocks and rock masses may be observed, recorded and mapped in the field. Written at a level suitable for undergraduate students of geology, this book (as with its companion volumes in the series) has firmly established itself as an essential tool for any geologist - student, professional or amateur - faced with the task of making a general description of an area of metamorphic rocks. A clear, systematic framework together with numerous diagrams, illustrations and checklists enables readers to produce useful and broadly similar descriptions, despite possible differences of background or specialist interest. This well-written and well-produced little text will, I am certain, become standard reading for most geology undergraduates.It will also interest many geologists who do not regularly work in metamorphic terrains and will be particularly useful to engineering geologists and civil engineers who are often concerned with describing the fabrics of metamorphic rocks without being concerned about their origins. M.E. Jones, Mineralogical Magazine Contents: Metamorphic Fieldwork and Mapping - Names and Categories of Metamorphic Rocks and Rock Units - Rock Banding - Minerals - Compositions - Grade - Textures - Fabric Types - Relations to Structures - Undeformed Pods - Augen - Pseudomorphs - Veins - Igneous Contacts - Metasomatism - Reaction Zones - Fault-Zones and Mylonites - Reference Tables and Checklists.
Table of Contents
Acknowledgements ix
Introduction 1 (6)
Aim and scope
Approach to metamorphic rocks
A few helpful concepts
Finding your way through the book
Further reading
Background 7 (14)
The stages of work
Origins of metamorphic rock structure
Names and categories of rocks
Mapping metamorphic rocks 21(8)
Use of field maps and field notebooks
Defining and mapping formations and markers
Contracts and boundries of metamorphic rocks
Banding 29(10)
Gross banding
Fine banding and striping
Three dimensions
Minerals, rock-types, compositions and grades 39(13)
Minerals
Fine-grained material
Rock-type names
Reporting rock-types
Compositional category and metamorphic grade
Textures, fabrics, cleavage and schistosity 52(15)
General
Textures
Fabric, cleavage and schistosity types
Deformation fabrics traversing a band
Deformation fabrics and folds
Scattered entities: pods, boudins, augen, 67(16)
pseudomorphs, veins and pegmatites
Boudins and shear-pods
Augen, flaser and large mineral grains
Pseudomorphs
Veins and pegmatites
Contacts and reaction zones 83(8)
Igneous contacts - aureoles and metasomatism
Reaction zones and chemical changes at
contacts
Faults, mylonites and cataclasites 91(6)
Faults
Fault and shear-zone rock-types
Reference tables and checklists 97
Compositional categories and their grade
indicators
Minerals
Mineral-based rock-type names
Checklist for recording textures and
fabrics (facing inside back cover)
Checklist of rock features (inside back
cover)
