In-situ Gesteinsspannungen und Mechanismen der Kluftöffnung |
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Authors: | Gerhard H Eisbacher |
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Institution: | (1) Present address: Geological Survey of Canada, 100 West Pender Str., Vancouver 3, B.C. |
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Abstract: | Zusammenfassung Die Orientierung von post-orogenen Klüften in proterozoischen Sedimentgesteinen des Elliot Lake-Gebietes, Canada, läßt sich mit der meßbaren Gesteinsentspannung in Bohrlöchern in Beziehung bringen. Steile lokale und regionale Kluftscharen ohne Bewegungsspuren streichen in Richtung der elastischen Hauptentformungsachse, also in Richtung der größten in-situ-Kompressionsspannung.Die Klüfte lassen sich deshalb wahrscheinlich als Extensionsfugen erklären, und zwar als Resultat der Wechselwirkung zwischen Oberflächenabtrag des Gesteins und remanenter tektonischer Gesteinsspannung. Der vorgeschlagene Mechanismus sollte auch zum Verständnis von spät-orogenen (ac)-Klüften in gefaltetem Deckgebirge und oberflächenparallelen Klüften in massigen Gesteinen beitragen.
Orientation of post-orogenic joints in Proterozoic sedimentary rocks of the Elliot Lake area (Canada) seems to be directly related to elastic-strain-recovery as measured in boreholes. Steep local and regional joint sets without displacement are parallel with the axis of maximum elastic-strain-recovery (i. e. the direction of the major principal in situ stress component). Consequently these joints are interpreted as extension joints forming as a result of the interaction between natural (or artificial) erosion of the rock mass and its remanent tectonic stresses. The proposed mechanism should also help to understand late-orogenic (ac)-joints in folded cover rocks and exfoliation joints in otherwise unjointed rocks.
Résumé L'orientation des diaclases post-tectoniques dans des roches sédimentaires protérozoïques de la région du Lac d'Elliot, Canada, peut être mise en relation avec les tensions élastiques des roches telles qu'on peut les mesurer dans les trous de forage. Les systèmes de diaclases redressées, locales et régionales, sans traces de mouvement, sont dirigés parallèlement aux axes principaux de la déformation élastique, c'est-à-dire à la direction de la plus grande compression in situ mesurée par le changement de forme d'un trou de sonde. Par conséquent, les diaclases s'expliquent vraisemblablement comme joints d'extension, et en fait comme le résultat de l'action réciproque entre des tensions tectoniques rémanentes et l'érosion en surface. Le mécanisme proposé explique aussi les diaclase (ac) tardives dans les couvertures plissées et l'exfoliation parallèle à la surface dans les roches massives.
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![scy](/content/j2wr63681m5332h5/xxlarge1089.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) , ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![bcy](/content/j2wr63681m5332h5/xxlarge1073.gif) ![hardcy](/content/j2wr63681m5332h5/xxlarge1098.gif) ![yacy](/content/j2wr63681m5332h5/xxlarge1103.gif) ![scy](/content/j2wr63681m5332h5/xxlarge1089.gif) ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) , ![kcy](/content/j2wr63681m5332h5/xxlarge1082.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![shchcy](/content/j2wr63681m5332h5/xxlarge1097.gif) ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![scy](/content/j2wr63681m5332h5/xxlarge1089.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![yacy](/content/j2wr63681m5332h5/xxlarge1103.gif) ![zhcy](/content/j2wr63681m5332h5/xxlarge1078.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) , ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) ![mcy](/content/j2wr63681m5332h5/xxlarge1084.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) , ![kcy](/content/j2wr63681m5332h5/xxlarge1082.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![zcy](/content/j2wr63681m5332h5/xxlarge1079.gif) ![ucy](/content/j2wr63681m5332h5/xxlarge1091.gif) ![lcy](/content/j2wr63681m5332h5/xxlarge1083.gif) ![softcy](/content/j2wr63681m5332h5/xxlarge1100.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![vcy](/content/j2wr63681m5332h5/xxlarge1074.gif) ![zcy](/content/j2wr63681m5332h5/xxlarge1079.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) ![mcy](/content/j2wr63681m5332h5/xxlarge1084.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![dcy](/content/j2wr63681m5332h5/xxlarge1076.gif) ![jcy](/content/j2wr63681m5332h5/xxlarge1081.gif) ![scy](/content/j2wr63681m5332h5/xxlarge1089.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![vcy](/content/j2wr63681m5332h5/xxlarge1074.gif) ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) ![scy](/content/j2wr63681m5332h5/xxlarge1089.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![scy](/content/j2wr63681m5332h5/xxlarge1089.gif) ![pcy](/content/j2wr63681m5332h5/xxlarge1087.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![vcy](/content/j2wr63681m5332h5/xxlarge1074.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![khcy](/content/j2wr63681m5332h5/xxlarge1093.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![scy](/content/j2wr63681m5332h5/xxlarge1089.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![pcy](/content/j2wr63681m5332h5/xxlarge1087.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![dcy](/content/j2wr63681m5332h5/xxlarge1076.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![pcy](/content/j2wr63681m5332h5/xxlarge1087.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![kcy](/content/j2wr63681m5332h5/xxlarge1082.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![shchcy](/content/j2wr63681m5332h5/xxlarge1097.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![yucy](/content/j2wr63681m5332h5/xxlarge1102.gif) ![shchcy](/content/j2wr63681m5332h5/xxlarge1097.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![gcy](/content/j2wr63681m5332h5/xxlarge1075.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![scy](/content/j2wr63681m5332h5/xxlarge1089.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![kcy](/content/j2wr63681m5332h5/xxlarge1082.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) ![chcy](/content/j2wr63681m5332h5/xxlarge1095.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![scy](/content/j2wr63681m5332h5/xxlarge1089.gif) ![kcy](/content/j2wr63681m5332h5/xxlarge1082.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![gcy](/content/j2wr63681m5332h5/xxlarge1075.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![pcy](/content/j2wr63681m5332h5/xxlarge1087.gif) ![yacy](/content/j2wr63681m5332h5/xxlarge1103.gif) ![zhcy](/content/j2wr63681m5332h5/xxlarge1078.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) . ![Ecy](/content/j2wr63681m5332h5/xxlarge1069.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![mcy](/content/j2wr63681m5332h5/xxlarge1084.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![khcy](/content/j2wr63681m5332h5/xxlarge1093.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) ![zcy](/content/j2wr63681m5332h5/xxlarge1079.gif) ![pcy](/content/j2wr63681m5332h5/xxlarge1087.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![mcy](/content/j2wr63681m5332h5/xxlarge1084.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![gcy](/content/j2wr63681m5332h5/xxlarge1075.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![kcy](/content/j2wr63681m5332h5/xxlarge1082.gif) ![zhcy](/content/j2wr63681m5332h5/xxlarge1078.gif) ![pcy](/content/j2wr63681m5332h5/xxlarge1087.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![yacy](/content/j2wr63681m5332h5/xxlarge1103.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![pcy](/content/j2wr63681m5332h5/xxlarge1087.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![yacy](/content/j2wr63681m5332h5/xxlarge1103.gif) ![vcy](/content/j2wr63681m5332h5/xxlarge1074.gif) ![lcy](/content/j2wr63681m5332h5/xxlarge1083.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) ![pcy](/content/j2wr63681m5332h5/xxlarge1087.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![zcy](/content/j2wr63681m5332h5/xxlarge1079.gif) ![dcy](/content/j2wr63681m5332h5/xxlarge1076.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![gcy](/content/j2wr63681m5332h5/xxlarge1075.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![ycy](/content/j2wr63681m5332h5/xxlarge1099.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![scy](/content/j2wr63681m5332h5/xxlarge1089.gif) -![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![shchcy](/content/j2wr63681m5332h5/xxlarge1097.gif) ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) ![scy](/content/j2wr63681m5332h5/xxlarge1089.gif) ![kcy](/content/j2wr63681m5332h5/xxlarge1082.gif) ![lcy](/content/j2wr63681m5332h5/xxlarge1083.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![dcy](/content/j2wr63681m5332h5/xxlarge1076.gif) ![chcy](/content/j2wr63681m5332h5/xxlarge1095.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![ycy](/content/j2wr63681m5332h5/xxlarge1099.gif) ![pcy](/content/j2wr63681m5332h5/xxlarge1087.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![kcy](/content/j2wr63681m5332h5/xxlarge1082.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![vcy](/content/j2wr63681m5332h5/xxlarge1074.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![ycy](/content/j2wr63681m5332h5/xxlarge1099.gif) ![gcy](/content/j2wr63681m5332h5/xxlarge1075.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![pcy](/content/j2wr63681m5332h5/xxlarge1087.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![lcy](/content/j2wr63681m5332h5/xxlarge1083.gif) ![lcy](/content/j2wr63681m5332h5/xxlarge1083.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![lcy](/content/j2wr63681m5332h5/xxlarge1083.gif) ![softcy](/content/j2wr63681m5332h5/xxlarge1100.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![ycy](/content/j2wr63681m5332h5/xxlarge1099.gif) ![pcy](/content/j2wr63681m5332h5/xxlarge1087.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![vcy](/content/j2wr63681m5332h5/xxlarge1074.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![khcy](/content/j2wr63681m5332h5/xxlarge1093.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![tcy](/content/j2wr63681m5332h5/xxlarge1090.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![iecy](/content/j2wr63681m5332h5/xxlarge1077.gif) ![shchcy](/content/j2wr63681m5332h5/xxlarge1097.gif) ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) ![mcy](/content/j2wr63681m5332h5/xxlarge1084.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) ![scy](/content/j2wr63681m5332h5/xxlarge1089.gif) ![scy](/content/j2wr63681m5332h5/xxlarge1089.gif) ![icy](/content/j2wr63681m5332h5/xxlarge1080.gif) ![vcy](/content/j2wr63681m5332h5/xxlarge1074.gif) ![ncy](/content/j2wr63681m5332h5/xxlarge1085.gif) ![ycy](/content/j2wr63681m5332h5/xxlarge1099.gif) ![gcy](/content/j2wr63681m5332h5/xxlarge1075.gif) ![ocy](/content/j2wr63681m5332h5/xxlarge1086.gif) ![rcy](/content/j2wr63681m5332h5/xxlarge1088.gif) ![acy](/content/j2wr63681m5332h5/xxlarge1072.gif) .
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