Formation mechanisms and near-surface stress orientations derived from fractographic markings on exfoliation joints in the Alps

M. Ziegler; S. Loew; D. Bahat

Formation mechanisms and near-surface stress orientations derived from fractographic markings on exfoliation joints in the Alps

M. Ziegler, S. Loew, D. Bahat

Department of Earth and Environmental sciences

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Granitic bedrock of the upper Aar valley (Grimsel area, Swiss Alps) contains four distinct exfoliation joint generations, which formed during different stages of the Pleistocene and occur in an Alpine landscape between inner trough valley bottoms and high mountain crests. Exfoliation joints of this investigation likely formed during the Middle Pleistocene (0.7-0.4 Ma; batch 1) and Upper Pleistocene to Holocene (45°) that indicate primarily downwards directed fracture propagation. These provide evidence for a distinctly different fracture mechanism. Figure 1. Sketch of fractographic features frequently encountered on exfoliation fractures (upper Aar valley, Swiss Alps).

Original language	English
Title of host publication	American Geophysical Union, Fall Meeting 2013
Volume	53
State	Published - 1 Dec 2013

Keywords

8010 STRUCTURAL GEOLOGY Fractures and faults
8164 TECTONOPHYSICS Stresses: crust and lithosphere
8040 STRUCTURAL GEOLOGY Remote sensing
9604 INFORMATION RELATED TO GEOLOGIC TIME Cenozoic

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@inproceedings{36c56d2f75c34695b84121c9896129e4,

title = "Formation mechanisms and near-surface stress orientations derived from fractographic markings on exfoliation joints in the Alps",

abstract = "Granitic bedrock of the upper Aar valley (Grimsel area, Swiss Alps) contains four distinct exfoliation joint generations, which formed during different stages of the Pleistocene and occur in an Alpine landscape between inner trough valley bottoms and high mountain crests. Exfoliation joints of this investigation likely formed during the Middle Pleistocene (0.7-0.4 Ma; batch 1) and Upper Pleistocene to Holocene (45°) that indicate primarily downwards directed fracture propagation. These provide evidence for a distinctly different fracture mechanism. Figure 1. Sketch of fractographic features frequently encountered on exfoliation fractures (upper Aar valley, Swiss Alps).",

keywords = "8010 STRUCTURAL GEOLOGY Fractures and faults, 8164 TECTONOPHYSICS Stresses: crust and lithosphere, 8040 STRUCTURAL GEOLOGY Remote sensing, 9604 INFORMATION RELATED TO GEOLOGIC TIME Cenozoic",

author = "M. Ziegler and S. Loew and D. Bahat",

year = "2013",

month = dec,

day = "1",

language = "English",

volume = "53",

booktitle = "American Geophysical Union, Fall Meeting 2013",

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TY - GEN

T1 - Formation mechanisms and near-surface stress orientations derived from fractographic markings on exfoliation joints in the Alps

AU - Ziegler, M.

AU - Loew, S.

AU - Bahat, D.

PY - 2013/12/1

Y1 - 2013/12/1

N2 - Granitic bedrock of the upper Aar valley (Grimsel area, Swiss Alps) contains four distinct exfoliation joint generations, which formed during different stages of the Pleistocene and occur in an Alpine landscape between inner trough valley bottoms and high mountain crests. Exfoliation joints of this investigation likely formed during the Middle Pleistocene (0.7-0.4 Ma; batch 1) and Upper Pleistocene to Holocene (45°) that indicate primarily downwards directed fracture propagation. These provide evidence for a distinctly different fracture mechanism. Figure 1. Sketch of fractographic features frequently encountered on exfoliation fractures (upper Aar valley, Swiss Alps).

AB - Granitic bedrock of the upper Aar valley (Grimsel area, Swiss Alps) contains four distinct exfoliation joint generations, which formed during different stages of the Pleistocene and occur in an Alpine landscape between inner trough valley bottoms and high mountain crests. Exfoliation joints of this investigation likely formed during the Middle Pleistocene (0.7-0.4 Ma; batch 1) and Upper Pleistocene to Holocene (45°) that indicate primarily downwards directed fracture propagation. These provide evidence for a distinctly different fracture mechanism. Figure 1. Sketch of fractographic features frequently encountered on exfoliation fractures (upper Aar valley, Swiss Alps).

KW - 8010 STRUCTURAL GEOLOGY Fractures and faults

KW - 8164 TECTONOPHYSICS Stresses: crust and lithosphere

KW - 8040 STRUCTURAL GEOLOGY Remote sensing

KW - 9604 INFORMATION RELATED TO GEOLOGIC TIME Cenozoic

M3 - Conference contribution

VL - 53

BT - American Geophysical Union, Fall Meeting 2013

ER -

Formation mechanisms and near-surface stress orientations derived from fractographic markings on exfoliation joints in the Alps

Abstract

Keywords

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