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Lewisian Geology of Gairloch

Product Code: M0026
Series: GSL Memoirs
Author/Editor: By R G Park (Keele University, UK)
Publication Date: 29 August 2002
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Description

This memoir presents a descriptive account and 1:20,000 coloured map of one of the most critical and interesting parts of the Lewisian complex of NW Scotland - a detached fragment of a supercontinent made up of Laurentia, Siberia and Baltica, which existed at the end of the early Proterozoic period. The Gairloch area, together with neighbouring Loch Maree, is the only part of the mainland Lewisian outcrop where Palaeoproterozoic supacrustal rocks (the Loch Maree Group) and their relationships to the Archaean basement can be studied, and has been the subject of a considerable amount of research, spanning a period of more than forty years. The Loch Maree Group represents an amalgamation of oceanic, trench, and arc assemblages with continental basement, and forms part of a Palaeoproterozoic collisional orogen stretching from Labrador through South Greenland to Scandinavia.

Type: Book
Ten Digit ISBN: 1-86239-116-5
Thirteen Digit ISBN: 978-1-86239-116-1
Publisher: GSL
Binding: Paperback
Pages: 88
Weight: 0.7 kg

Contents

Preface • Acknowledgements • Chapter 1: Introduction1.1 Background • 1.1.1 Wider Significance of the Gairloch area • 1.1.2 Description of the study area • 1.1.3 Mapping history • 1.2 Summary of the Lewisian geology of the NW Scottish mainland • 1.2.1 Historical background to Lewisian chronology • 1.2.2 Subdivision of the mainland Lewisian outcrop • 1.2.3 The Scourian gneisses • Origin of the gneisses • 1.2.4 Scourian deformation and metamorphism • 1.2.5 The Inverian event • 1.2.6 The Scourie dyke swarm • 1.2.7 The Loch Maree Group • 1.2.8 Laxfordian modifications and younger events • The early Laxfordian • The Late Laxfordian • 1.3 Southern Region nomenclature • Chapter 2: The Early Stages – Scourian and Inverian 2.1 Petrography and distribution of the Archaean gneisses • 2.1.1 Quartzo-feldspathic biotite gneisses • 2.1.2 Hornblende gneisses • 2.1.3 Amphibolites of the ‘early basic’ suite • 2.2 Chemistry and origin • 2.2.1 Quartzo-feldspathic gneisses • 2.2.2 Amphibolites • 2.3 Structural chronology • 2.4 Scourian and Inverian structure • 2.4.1 Braigh Horrisdale • 2.4.2 Creag Mhor Thollaidh • 2.4.3 The Ialltaig block • 2.5 Metamorphism • Chapter 3: The Scourie Dyke Suite 3.1 Distribution and field relation • 3.1.1 SW of the LMG belt • 3.1.2 NE of the LMG bult • 3.2 Petrography • 3.3 chemistry and origin • Chapter 4: The Loch Maree Group 4.1 Semipelites • 4.1.1 Distribution • 4.1.2 Petrography • 4.1.3 Geochemistry and origin • 4.1.4 Zircon age date • 4.2 Other metasediment types • 4.3 Carbonate (marble) • 4.3.1 Distribution and petrography • 4.3.2 Geochemistry • 4.4 Banded-iron formation • 4.4.1 Distribution and petrography • 4.4.2 Geochemistry • 4.4.3 Origin • 4.5 Graphitic pelite • 4.6 Quartz-chlorite schist • 4.6.1 Distribution and petrography • 4.6.2 Geochemistry and origin • 4.7 Garnet-biotite schist • 4.7.1 Distribution and petrography • 4.7.2 Geochemistry and origin • 4.8 Origin of the BIF – carbonate – graphitic pelite assemblage • 4.9 Amphibolites • 4.9.1 Distribution and petrography • 4.9.2 Geochemistry • 4.9.3 Origin • 4.10 Stratiform sulphide deposits within the Loch Maree Group • 4.11 Origin of the Loch Maree Group • 4.11.1 Semipelites • 4.11.2 Other metasediments • 4.11.3 Amphibolites • Chapter 5: Laxfordian Intrusive Rocks 5.1 The Ard-type gneisses • 5.1.1 Distribution and structural relationships • 5.1.2 Petrography • 5.1.3 Geochemistry • 5.1.4 Geochronology • 5.2 Granite sheets • 5.3 Granitoid pegmatites • 5.3.1 Distribution and petrography • 5.3.2 Geochemistry • 5.3.3 Geochronology • Chapter 6: Laxfordian Structure and Metamorphism 6.1 Introduction • 6.1.1 Structural overview • 6.1.2 Deformation phases and chronology • 6.1.3 Metamorphic conditions • 6.2 Early Laxfordian (D1/D2) • 6.2.1 Narrow marginal shear zones in Scourie dykes • 6.2.2 SW of the Loch Maree Group outcrop • 6.2.3 Supracrustal rocks of the Gairloch schist belt • 6.2.4 The NE limb of the Tollie antiform • 6.2.5 The western margin of the Creag Mhor Thollaidh block • 6.2.6 The ard gneiss • 6.2.7 Relationship between D1 and D2 6.2.8 Change in plunge of L2 in the Ard gneiss outcrop • 6.3 Large-scale D2 structure • 6.4 Late Laxfordian • 6.4.1 D3 minor structure • 6.4.2 D3 major structures • The Tolloie antiform and Gairloch shear zone • The Mill na Claise fold • 6.4.3 D 4 structures • 6.5 Brittle-ductile shear zones • 6.5.1 Early (D2) mylonitic rocks • 6.5.2 D3 mylonites associated with the Gairloch shear zone • 6.5.3 Later movements in the zones • 6.6 Summary of Laxfordian tectonic history • 6.7 Faults • 6.7.1 Pre-Torridonian faults • The Flowerdale fault • N-S thrusts • N-trending strike-slip faults • NE-trending normal faults • 6.7.2 Post-Torridonian faults • The Loch Maree fault • NE-trending normal faults • Chapter 7: Tectonic Interpretation and Regional Significance 7.1 the Archaean (Scourian) • 7.2 The Inverian: earlier Palaeoproterozoic? • 7.3 The Scourie dyke swarm: evens from c.2.4 to c. 2.0 Ga? • 7.4 The Laxfordian: later Palaeoproterozoic • 7.4.1 The early Laxfordian: subduction – accretion- collision model • 7.4.2 Later Laxfordian structural history • 7.4.3 Post-D3 tectonic history • 7.5 Palaeoproterozoic belts of the North Atlantic region • References •

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