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Emplacement Mechanisms of Nappes and Thrust Sheets : Petrology and Structural Geology, V. 9 - Olivier Merle

Emplacement Mechanisms of Nappes and Thrust Sheets

Petrology and Structural Geology, V. 9

Hardcover Published: 31st October 1998
ISBN: 9780792348795
Number Of Pages: 160

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Nappes and overthrusts are the mosl representative geological structures in mountain chains. The issue of their emplacement mechanisms and of the driving force of these displacements is a major problem in tectonics which interests, for near to a century now and not without harsh controversies, a significant proportion of structural geologists and geoscientists who work in the field of rock mechanics. This book attempts to give a clear and didactic synthesis of the current knowledge of the concept of thrusting, principally by tackling two approaches, mechanics and kinematics, which have proposed some solutions to this problem. At first (Chapter I), the notions of thrusting are defined, with the most recent terminology and the most important geometric aspects. This introduction to the geometry of thrusts is logically followed by the presentation of their problem; the issue of the emplacement mechanisms (Chapter 2). Let us note in passing that the formulation of the concept and the presentation of its problem are associated historically, which justifies presenting them in the historical framework of this discovery before tackling the different solutions and mechanical hypotheses. These are detailed in Chapter 3 by following a chronological progression, and emphasising the divergences and oppositions between different models so as to cover them fully. The chapter on the kinematics (Chapter 4) then returns to the type of data which can be collected in the field, by clarifying the relationships between displacement and internal strain.

The Concept Of Thrustingp. 1
Nappes, Overthrusts And Fold-Nappesp. 1
Thick And Thin-Skinned Thrustingp. 8
Ramp And Flat Geometryp. 12
The Concept Of Displacementp. 18
The Measurement Of Displacementp. 23
Backgroundp. 29
Historical Overview Of The Discovery Of Nappesp. 29
The Question Of Emplacement Mechanismsp. 41
Mechanicsp. 49
The Mechanical Paradoxp. 49
Resolution Of The Mechanical Paradoxp. 54
Composite Modelsp. 72
The Role Of Erosionp. 74
Classification Of Emplacement Mechanismsp. 78
Kinematicsp. 81
The Kinematics Approachp. 81
Theoretical And Experimental Strain Patternsp. 84
Displacement Trajectoryp. 102
Foldingp. 106
Emergent Rampp. 111
Lateral Rampsp. 117
A Few Examples From The Alpine Chainp. 123
The Internal Zone: Crustal Stacking And Basement Nappesp. 123
The Helvetic Nappes: Extrusion, Spreading And Ductile Glidingp. 126
The Pre-Alps: Rigid Glidingp. 126
Molasses: Testimony To Crustal Thickeningp. 128
The Jura: A Fold And Thrust Beltp. 130
The Southern Alps: Rear Compressionp. 133
Referencesp. 135
Indexp. 151
Legend for Geological Cross Sectionsp. 159
Table of Contents provided by Blackwell. All Rights Reserved.

ISBN: 9780792348795
ISBN-10: 0792348796
Series: Petrology and Structural Geology, V. 9
Audience: Professional
Format: Hardcover
Language: English
Number Of Pages: 160
Published: 31st October 1998
Publisher: Springer
Country of Publication: NL
Dimensions (cm): 24.77 x 16.51  x 1.91
Weight (kg): 0.52