Editing Jersey: description of 1:25 000 Channel Islands Sheet 2

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[[File:P992218.jpg|thumbnail|Rear cover]]
 
[[File:P992218.jpg|thumbnail|Rear cover]]
  
== Contents ==
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== Jersey - description of 1:25 000 Channel Islands Sheet 2 ==
  
'''[[Jersey: description of 1:25 000 Channel Islands Sheet 2#Authors and contributors|Authors and contributors]]'''
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=== [[Jersey: description of 1:25 000 Channel Islands Sheet 2#Authors and contributors|Authors and contributors]] ===
  
'''[[Jersey: description of 1:25 000 Channel Islands Sheet 2#Preface|Preface]]'''
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=== [[Introduction - Jersey - description of 1:25 000 Channel Islands Sheet 2|Chapter 1 Introduction]] ===
  
'''[[Jersey: description of 1:25 000 Channel Islands Sheet 2#Notes|Notes]]'''
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=== [[Jersey Shale Formation - Jersey, description of 1:25 000 Channel Islands Sheet 2|Chapter 2 Jersey Shale Formation]] ===
  
'''[[Introduction - Jersey: description of 1:25 000 Channel Islands Sheet 2|Chapter 1 Introduction]]'''
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:[[Jersey Shale Formation - Jersey, description of 1:25 000 Channel Islands Sheet 2#Outcrop distribution and exposure|Outcrop distribution and exposure]]
  
'''[[Jersey Shale Formation - Jersey: description of 1:25 000 Channel Islands Sheet 2|Chapter 2 Jersey Shale Formation]]'''
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:[[Jersey Shale Formation - Jersey, description of 1:25 000 Channel Islands Sheet 2#Lithology|Lithology]]
  
:[[Jersey Shale Formation - Jersey: description of 1:25 000 Channel Islands Sheet 2#Outcrop distribution and exposure|Outcrop distribution and exposure]]
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:[[Jersey Shale Formation - Jersey, description of 1:25 000 Channel Islands Sheet 2#Metamorphism|Metamorphism]]
  
:[[Jersey Shale Formation - Jersey: description of 1:25 000 Channel Islands Sheet 2#Lithology|Lithology]]
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:[[Jersey Shale Formation - Jersey, description of 1:25 000 Channel Islands Sheet 2#Sedimentology|Sedimentology]]
  
:[[Jersey Shale Formation - Jersey: description of 1:25 000 Channel Islands Sheet 2#Metamorphism|Metamorphism]]
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:[[Jersey Shale Formation - Jersey, description of 1:25 000 Channel Islands Sheet 2#Environment of deposition|Environment of deposition]]
  
:[[Jersey Shale Formation - Jersey: description of 1:25 000 Channel Islands Sheet 2#Sedimentology|Sedimentology]]
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:[[Jersey Shale Formation - Jersey, description of 1:25 000 Channel Islands Sheet 2#The regional setting|The regional setting]]
  
:[[Jersey Shale Formation - Jersey: description of 1:25 000 Channel Islands Sheet 2#Environment of deposition|Environment of deposition]]
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[[Jersey Volcanic Group - Jersey, description of 1:25 000 Channel Islands Sheet 2|Chapter 3 Jersey Volcanic Group]]
  
:[[Jersey Shale Formation - Jersey: description of 1:25 000 Channel Islands Sheet 2#The regional setting|The regional setting]]
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:[[Jersey Volcanic Group - Jersey, description of 1:25 000 Channel Islands Sheet 2#St Saviour's Andesite Formation|St Saviour's Andesite Formation]]
  
'''[[Jersey Volcanic Group - Jersey: description of 1:25 000 Channel Islands Sheet 2|Chapter 3 Jersey Volcanic Group]]'''
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:[[Jersey Volcanic Group - Jersey, description of 1:25 000 Channel Islands Sheet 2#St John's Rhyolite Formation|St John's Rhyolite Formation]]
  
:[[Jersey Volcanic Group - Jersey: description of 1:25 000 Channel Islands Sheet 2#St Saviour's Andesite Formation|St Saviour's Andesite Formation]]
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:[[Jersey Volcanic Group - Jersey, description of 1:25 000 Channel Islands Sheet 2#Bouley Rhyolite Formation|Bouley Rhyolite Formation]]
  
:[[Jersey Volcanic Group - Jersey: description of 1:25 000 Channel Islands Sheet 2#St John's Rhyolite Formation|St John's Rhyolite Formation]]
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[[Rozel Conglomerate Formation - Jersey, description of 1:25 000 Channel Islands Sheet 2|Chapter 4 Rozel Conglomerate Formation]]
  
:[[Jersey Volcanic Group - Jersey: description of 1:25 000 Channel Islands Sheet 2#Bouley Rhyolite Formation|Bouley Rhyolite Formation]]
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[[Plutonic igneous rocks - Jersey, description of 1:25 000 Channel Islands Sheet 2|Chapter 5 Plutonic igneous rocks]]
  
'''[[Rozel Conglomerate Formation - Jersey: description of 1:25 000 Channel Islands Sheet 2|Chapter 4 Rozel Conglomerate Formation]]'''
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:[[Plutonic igneous rocks - Jersey, description of 1:25 000 Channel Islands Sheet 2#Gabbro and diorite|Gabbro and diorite]]
  
'''[[Plutonic igneous rocks - Jersey: description of 1:25 000 Channel Islands Sheet 2|Chapter 5 Plutonic igneous rocks]]'''
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:[[Plutonic igneous rocks - Jersey, description of 1:25 000 Channel Islands Sheet 2#North-west granite|North-west granite]]
  
:[[Plutonic igneous rocks - Jersey: description of 1:25 000 Channel Islands Sheet 2#Gabbro and diorite|Gabbro and diorite]]
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:[[Plutonic igneous rocks - Jersey, description of 1:25 000 Channel Islands Sheet 2#Belle Hougue igneous complex|Belle Hougue igneous complex]]
  
:[[Plutonic igneous rocks - Jersey: description of 1:25 000 Channel Islands Sheet 2#North-west granite|North-west granite]]
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:[[Plutonic igneous rocks - Jersey, description of 1:25 000 Channel Islands Sheet 2#South-west granite|South-west granite]]
  
:[[Plutonic igneous rocks - Jersey: description of 1:25 000 Channel Islands Sheet 2#Belle Hougue igneous complex|Belle Hougue igneous complex]]
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:[[Plutonic igneous rocks - Jersey, description of 1:25 000 Channel Islands Sheet 2#South-east granite|South-east granite]]
  
:[[Plutonic igneous rocks - Jersey: description of 1:25 000 Channel Islands Sheet 2#South-west granite|South-west granite]]
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[[Minor igneous intrusions - Jersey, description of 1:25 000 Channel Islands Sheet 2|Chapter 6 Minor igneous intrusions]]
  
:[[Plutonic igneous rocks - Jersey: description of 1:25 000 Channel Islands Sheet 2#South-east granite|South-east granite]]
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:[[Minor igneous intrusions - Jersey, description of 1:25 000 Channel Islands Sheet 2#Basic intrusions|Basic intrusions]]
  
'''[[Minor igneous intrusions - Jersey: description of 1:25 000 Channel Islands Sheet 2|Chapter 6 Minor igneous intrusions]]'''
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:[[Minor igneous intrusions - Jersey, description of 1:25 000 Channel Islands Sheet 2#Acid intrusions|Acid intrusions]]
  
:[[Minor igneous intrusions - Jersey: description of 1:25 000 Channel Islands Sheet 2#Basic intrusions|Basic intrusions]]
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:[[Minor igneous intrusions - Jersey, description of 1:25 000 Channel Islands Sheet 2#Lamprophyres|Lamprophyres]]
  
:[[Minor igneous intrusions - Jersey: description of 1:25 000 Channel Islands Sheet 2#Acid intrusions|Acid intrusions]]
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:[[Minor igneous intrusions - Jersey, description of 1:25 000 Channel Islands Sheet 2#Intrusive sequence|Intrusive sequence]]
  
:[[Minor igneous intrusions - Jersey: description of 1:25 000 Channel Islands Sheet 2#Lamprophyres|Lamprophyres]]
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:[[Minor igneous intrusions - Jersey, description of 1:25 000 Channel Islands Sheet 2#Genesis|Genesis]]
  
:[[Minor igneous intrusions - Jersey: description of 1:25 000 Channel Islands Sheet 2#Intrusive sequence|Intrusive sequence]]
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===[[Geological structure - Jersey, description of 1:25 000 Channel Islands Sheet 2|Chapter 7 Geological structure]]===
  
:[[Minor igneous intrusions - Jersey: description of 1:25 000 Channel Islands Sheet 2#Genesis|Genesis]]
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[[Geological structure - Jersey, description of 1:25 000 Channel Islands Sheet 2#Folds in the Jersey Shale Formation|Folds in the Jersey Shale Formation]]
  
'''[[Geological structure - Jersey: description of 1:25 000 Channel Islands Sheet 2|Chapter 7 Geological structure]]'''
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:[[Geological structure - Jersey, description of 1:25 000 Channel Islands Sheet 2#Folds in the Jersey Volcanic Group|Folds in the Jersey Volcanic Group]]
  
:[[Geological structure - Jersey: description of 1:25 000 Channel Islands Sheet 2#Folds in the Jersey Shale Formation|Folds in the Jersey Shale Formation]]
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:[[Geological structure - Jersey, description of 1:25 000 Channel Islands Sheet 2#Folds in the Rozel Conglomerate Formation|Folds in the Rozel Conglomerate Formation]]
  
:[[Geological structure - Jersey: description of 1:25 000 Channel Islands Sheet 2#Folds in the Jersey Volcanic Group|Folds in the Jersey Volcanic Group]]
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:[[Geological structure - Jersey, description of 1:25 000 Channel Islands Sheet 2#Faults|Faults]]
  
:[[Geological structure - Jersey: description of 1:25 000 Channel Islands Sheet 2#Folds in the Rozel Conglomerate Formation|Folds in the Rozel Conglomerate Formation]]
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:[[Geological structure - Jersey, description of 1:25 000 Channel Islands Sheet 2#Tectonic history|Tectonic history]]
  
:[[Geological structure - Jersey: description of 1:25 000 Channel Islands Sheet 2#Faults|Faults]]
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===[[Quaternary deposits - Jersey, description of 1:25 000 Channel Islands Sheet 2|Chapter 8 Quaternary deposits]]===
  
:[[Geological structure - Jersey: description of 1:25 000 Channel Islands Sheet 2#Tectonic history|Tectonic history]]
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:[[Quaternary deposits - Jersey, description of 1:25 000 Channel Islands Sheet 2#Pleistocene|Pleistocene]]
  
'''[[Quaternary deposits - Jersey: description of 1:25 000 Channel Islands Sheet 2|Chapter 8 Quaternary deposits]]'''
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:[[Quaternary deposits - Jersey, description of 1:25 000 Channel Islands Sheet 2#Holocene|Holocene]]
  
:[[Quaternary deposits - Jersey: description of 1:25 000 Channel Islands Sheet 2#Pleistocene|Pleistocene]]
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===[[Geophysical field surveys - Jersey, description of 1:25 000 Channel Islands Sheet 2|Chapter 9 Geophysical field surveys]]===
  
:[[Quaternary deposits - Jersey: description of 1:25 000 Channel Islands Sheet 2#Holocene|Holocene]]
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:[[Geophysical field surveys - Jersey, description of 1:25 000 Channel Islands Sheet 2#Gravity survey|Gravity survey]]
  
'''[[Geophysical field surveys - Jersey: description of 1:25 000 Channel Islands Sheet 2|Chapter 9 Geophysical field surveys]]'''
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:[[Geophysical field surveys - Jersey, description of 1:25 000 Channel Islands Sheet 2#Magnetic survey|Magnetic survey]]
  
:[[Geophysical field surveys - Jersey: description of 1:25 000 Channel Islands Sheet 2#Gravity survey|Gravity survey]]
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===[[Economic geology - Jersey, description of 1:25 000 Channel Islands Sheet 2|Chapter 10 Economic geology]]===
  
:[[Geophysical field surveys - Jersey: description of 1:25 000 Channel Islands Sheet 2#Magnetic survey|Magnetic survey]]
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:[[Economic geology - Jersey, description of 1:25 000 Channel Islands Sheet 2#Quarrying|Quarrying]]
  
'''[[Economic geology - Jersey: description of 1:25 000 Channel Islands Sheet 2|Chapter 10 Economic geology]]'''
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:[[Economic geology - Jersey, description of 1:25 000 Channel Islands Sheet 2#Sand and gravel|Sand and gravel]]
  
:[[Economic geology - Jersey: description of 1:25 000 Channel Islands Sheet 2#Quarrying|Quarrying]]
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:[[Economic geology - Jersey, description of 1:25 000 Channel Islands Sheet 2#Brick clay and brickearth|Brick clay and brickearth]]
  
:[[Economic geology - Jersey: description of 1:25 000 Channel Islands Sheet 2#Sand and gravel|Sand and gravel]]
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:[[Economic geology - Jersey, description of 1:25 000 Channel Islands Sheet 2#Limestone|Limestone]]
  
:[[Economic geology - Jersey: description of 1:25 000 Channel Islands Sheet 2#Brick clay and brickearth|Brick clay and brickearth]]
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:[[Economic geology - Jersey, description of 1:25 000 Channel Islands Sheet 2#Fuel|Fuel]]
  
:[[Economic geology - Jersey: description of 1:25 000 Channel Islands Sheet 2#Limestone|Limestone]]
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:[[Economic geology - Jersey, description of 1:25 000 Channel Islands Sheet 2#Minerals|Minerals]]
  
:[[Economic geology - Jersey: description of 1:25 000 Channel Islands Sheet 2#Fuel|Fuel]]
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:[[Economic geology - Jersey, description of 1:25 000 Channel Islands Sheet 2#Water supply|Water supply]]
  
:[[Economic geology - Jersey: description of 1:25 000 Channel Islands Sheet 2#Minerals|Minerals]]
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===[[Jersey: description of 1:25 000 Channel Islands Sheet 2#References|References]]===
  
:[[Economic geology - Jersey: description of 1:25 000 Channel Islands Sheet 2#Water supply|Water supply]]
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===[[Jersey: description of 1:25 000 Channel Islands Sheet 2#Glossary|Glossary]]===
 
 
'''[[Jersey: description of 1:25 000 Channel Islands Sheet 2#References|References]]'''
 
 
 
'''[[Jersey: description of 1:25 000 Channel Islands Sheet 2#Glossary|Glossary]]'''
 
  
 
== Authors and contributors ==
 
== Authors and contributors ==
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* R. A. Clark, BSc, PhD Department of Earth Sciences, University of Leeds, Leeds LS2 417
 
* R. A. Clark, BSc, PhD Department of Earth Sciences, University of Leeds, Leeds LS2 417
 
* D. G. Helm, BSc, PhD Department of Earth Sciences, Goldsmiths' College, University of London, Rachel McMillan Building, Creek Road, London SE8 .3BU
 
* D. G. Helm, BSc, PhD Department of Earth Sciences, Goldsmiths' College, University of London, Rachel McMillan Building, Creek Road, London SE8 .3BU
* D. H. Keen, BSc, PhD Department of Geography, Coventry (Lanchester) Polytechnic, Priory Street, Coventry CV1 5FB
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* = D. H. Keen, BSc, PhD Department of Geography, Coventry (Lanchester) Polytechnic, Priory Street, Coventry CV1 5FB =
 
* G. J. Lees, BSc Department of Geology, University of Keele, Keele, Staffordshire ST5 5BG
 
* G. J. Lees, BSc Department of Geology, University of Keele, Keele, Staffordshire ST5 5BG
 
* A. E. Mourant, MA, DPhil, DM, FRCP, FRS The Dower House, Maison de Haut, Longueville, St Saviour, Jersey, Channel Islands
 
* A. E. Mourant, MA, DPhil, DM, FRCP, FRS The Dower House, Maison de Haut, Longueville, St Saviour, Jersey, Channel Islands
 
* J. T. Renouf, Bsc., PhD Maison Petit Port, St Brelade, ,Jersey, Channel Islands
 
* J. T. Renouf, Bsc., PhD Maison Petit Port, St Brelade, ,Jersey, Channel Islands
* C. M. Thomas, BSc, PhD Esso Norge, PO Box 60, N4033 Forus, Norway
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* C. M. Thomas, BSc, PhD Esso Norge, PO Box 60, N4033 Forus, Norway  
 
 
== Preface ==
 
 
 
This handbook describes the geology of Jersey, as depicted on the 1:25 000 map published in 1982, and is intended to be read in conjunction with the map.
 
 
 
A geological survey of Jersey was carried out between 1972 and 1977, under a Natural Environment Research Council research contract, by staff of Queen Mary College, University of London, on behalf of the Institute of Geological Sciences (now the British Geological Survey) and the States of Jersey (Island Development Committee). The field work was directed for Queen Mary College by Professor J. F. Kirkaldy until his retirement in 1974, and then by the late Professor W. W. Bishop, supervision being the responsibility of Dr A. C. Bishop and Dr W. J. French. Mr G. Bisson was the District Geologist in charge for the Institute of Geological Sciences, and throughout the work the survey team benefited from the advice and assistance of Dr A. E. Mourant, FRS.
 
 
 
In the handbook, Dr Bishop has written the Introduction (Chapter 1), and the chapters on plutonic igneous rocks, minor igneous intrusions (incorportating information from Mr G. J. Lees of the University of Keele), and economic geology. The chapter dealing with the Rozel Conglomerate has been written by Dr J. T. Renouf, that on the Jersey Shale Formation is by Dr D. G. Helm, and that on the Quaternary deposits is by Dr D. H. Keen. The chapter on geophysical field surveys has been provided by Professor J. C. Briden, and Dr R. A. Clark of Leeds University, and contributions on palaeomagnetism by Dr B. A. Duff, also of Leeds University, have been included at appropriate places in the text. Mr Bisson has compiled the chapter on volcanic rocks from the unpublished PhD thesis by Dr G. M. Thomas, and the chapter on geological structure mainly from the doctoral thesis by Dr A. D. Squire and the works of Dr Helm and Dr Thomas. Dr N. J. Snelling has advised concerning the geochronology. Contributions from numerous sources, but particularly from Dr Mourant, have been incorporated. It has been necessary to assume that the reader has a basic knowledge of geology, but a glossary of terms that may be unfamiliar has been appended. The handbook has been edited by Mr Bisson.
 
 
 
It gives me great pleasure to thank all the people concerned for their efforts in bringing this work to completion, and Mr R. B. Skinner, Chief Executive Officer of the Island Development Committee, for his sustained interest and support.
 
 
 
F G Larminie, OBE Director, British Geological Survey, Keyworth, Nottinghamshire. NG12 5GG 5 November 1988
 
 
 
== Notes ==
 
 
 
Grid references are given in the form [5750 5638] throughout this handbook; they are related to the UTM co-ordinates printed on the 1:25 000 geological map.
 
 
 
Numbers preceded by the letter A refer to photographs in the Geological Survey collections.
 
 
 
Numbers preceded by 'Birm' and 'SRR' relate to samples that have been subjected to radiocarbon dating at Birmingham University Geology Department and at the Scottish Universities Research and Reactor Centre respectively.
 
 
 
The isotopic ages given in this work have been recalculated according to the decay constants recommended by the Subcommission of Geochronology at the International Geological Congress in Sydney, Australia, in 1976. As shown in the table below, these constants differ slightly from those of the original cited works, as do the calculated ages.
 
 
 
 
 
{| class="wikitable"
 
|-
 
| | Decay scheme
 
| | Former decay constant
 
| | Adopted decay constant
 
|-
 
| | <sup>238</sup>U→<sup>206</sup>Pb
 
| | 1.537 x 10<sup>−10</sup>/a
 
| | 1.55125 x 10<sup>−10</sup>/a
 
|-
 
| | <sup>235</sup>U→<sup>207</sup>Pb
 
| | 9.722 x 10<sup>−10</sup>/a
 
| | 9.8485 x 10<sup>−10</sup>/a
 
|-
 
| | <sup>232</sup>Th→<sup>208</sup>Pb
 
| | 4.990 x 10<sup>−10</sup>/a
 
| | 4.9475 x 10<sup>−10</sup>/a
 
|-
 
| | <sup>87</sup>Rb→<sup>87</sup>Sr
 
| | 1.47 x 10<sup>−11</sup>/a
 
| | 1.42 x 10<sup>−11</sup>/a
 
|-
 
| |
 
| | 1.39 x 10<sup>−11</sup>/a
 
| | 1.42 x 10<sup>−11</sup>/a
 
|-
 
| | <sup>40</sup>K→<sup>40</sup>Ar
 
| | λ<sub>e</sub>+λ<sub>e</sub>′ 0.585 x 10<sup>−10</sup>/a
 
| | 0.581 x 10<sup>−10</sup>/a
 
|-
 
| |
 
| | λ<sub>β</sub>4.72 x 10<sup>−10</sup>/a
 
| | 4.962 x 10<sup>−10</sup>/a
 
|-
 
| |
 
| | <sup>40</sup>K/K = 0.0119 atomic%
 
| | 0.01167 atomic%
 
|-
 
|}
 
 
 
λβ = decay by beta emission
 
 
 
λe = decay by electron capture
 
 
 
λ<sub>e</sub>′ = decay by electron capture and decay to ground state
 
 
 
In Chapter 3, Jersey Volcanic Group, the petrographical nomenclature used is based on the work of Ross and Smith, 1961 (see References, p. 112).
 
 
 
  
 
== References ==
 
== References ==

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