The Field Description of Igneous Rocks

The Second Edition of this unique pocket field guide has been thoroughly revised and updated to include the advances in physical volcanology, emplacement of magmas, and interpreting structures and textures in igneous rocks. The book has included new techniques, such as AMS and geophysical studies of pluton shape at depth, and new topics such as the occurrence of porphyrys, laccoliths, and magma sediment interaction. Part of the successful Field Guide series, this book includes new sections featuring Granitic rocks, basaltic rocks, magma mixing and mingling, and engineering properties and mineralization.

Revised by Dr Nicholas Petford, Lecturer at School of Earth Sciences, Kingston University, London, UK.

Written by Richard Thorpe (Deceased) and Geoffrey Brown (Deceased).

Preface	p. xi
Acknowledgements	p. xv
Introduction and Occurrence	p. 1
The Importance of Fieldwork	p. 1
The Global Picture - Igneous Rocks in Relation to Regional Tectonics	p. 2
Mode of Occurrence of Igneous Bodies	p. 4
Summary	p. 11
Field Skills and Outcrop Structures	p. 15
Equipment	p. 15
Preparing Maps and Basic Mapping	p. 16
Notebooks and Data Recording	p. 17
Primary Outcrop Structures	p. 18
Secondary or Late Stage Outcrop Structures	p. 28
Outcrop Contact Relationships	p. 32
Summary of Igneous Outcrop Descriptions	p. 33
Igneous Textures and Classification	p. 37
Describing Rock Types	p. 37
Colour and Composition	p. 38
Texture, Grain-Size/Shape and Fabric	p. 43
Mineral Identification	p. 49
Naming and Classification	p. 58
Volcanics 1 - Lava Flows	p. 69
Lava Flow Emplacement Mechanisms	p. 69
A Compositional Divide for Lava Flows	p. 71
Mafic/Basaltic Lava Flows	p. 73
Felsic/Silicic Flows	p. 80
Pillow Lavas and Hyaloclastites	p. 82
Volcanics 2 - Pyroclastic Rocks	p. 93
Structures, Textures and Classification	p. 93
Pyroclastic Flows and Ignimbrites	p. 101
Scoria Cones	p. 108
Water/Magma and Sediment/Magma Interactions	p. 109
Epiclastic Deposits	p. 112
Shallow-Level Intrusions	p. 119
Sill and Dykes	p. 119
Working Out Emplacement History	p. 124
Volcanic Plugs and Diatremes	p. 130
High-Level Subvolcanic Intrusions	p. 133
Granitic Complexes	p. 137
Introduction	p. 137
General Features and Occurrence	p. 137
Zoned Plutons	p. 142
Internal Structures and Textures	p. 145
Internal Contacts	p. 150
Emplacement Timing	p. 158
Distinctive Granitoid Textures	p. 162
Metamorphic Aureoles	p. 164
Summary of the Field Characteristics of Granitic Complexes	p. 165
Mafic Complexes	p. 171
General Features and Occurrence	p. 171
Continental Mafic-Ultramafic Intrusions	p. 173
Ophiolite Complexes	p. 177
Komatiites	p. 183
Summary of the Field Characteristics of Mafic-Ultramafic Intrusions	p. 184
Magma Mixing and Mingling	p. 189
Magma Rheology	p. 189
Magma Mixing	p. 190
Magma Mingling	p. 192
Synplutonic Dykes and Sills	p. 196
Magma Mingling in Subvolcanic and Volcanic Environments	p. 200
Xenoliths	p. 201
A Word of Warning	p. 202
Summary	p. 203
Mineralisation and Geotechnical Properties	p. 207
Mineralisation and Key Minerals	p. 207
Mineralisation in Layered Mafic Intrusions	p. 209
Geotechnical Properties of Igneous Rocks	p. 213
Rock Mass Classification	p. 216
Summary	p. 226
Appendix	p. 229
Further Reading	p. 231
Index	p. 233
Table of Contents provided by Ingram. All Rights Reserved.

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The Field Description of Igneous Rocks

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