Age and depth evidence for pre-exhumation joints in granite plutons: fracturing during the early cooling stage of felsic rock
Published:January 01, 2004
P. Bankwitz, E. Bankwitz, R. Thomas, K. Wemmer, H. Kämpf, 2004. "Age and depth evidence for pre-exhumation joints in granite plutons: fracturing during the early cooling stage of felsic rock", The Initiation, Propagation, and Arrest of Joints and Other Fractures, J. W. Cosgrove, T. Engelder
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This chapter documents the fracture process associated with the early cooling stage of felsic magma. Characteristics of pre-exhumation joints include their spatial distribution in granite bodies, their fracture surface morphology, and geological and petrological evidence for the depth of fracture initiation. These characteristics allow inferences about the depth and the time of joint origin in the South Bohemian Pluton. The intrusion levels of currently exposed granites of the pluton were 7.4 km in the northern part and 14.3 km in the southern part.
Within the northern Mrákotín Granite (Boršov) early NNE joints propagated while the granite was at a...
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The Initiation, Propagation, and Arrest of Joints and Other Fractures
This volume is a state of the art look at our understanding of joint development in the crust. Answers are provided for such questions as the mechanisms by which joints are initiated, the factors controlling the path they follow during the propagation process, and the processes responsible for the arrest of joints. Many of the answers to these questions can be inferred from the geometry of joint surface morphology and joint patterns. Joints are a record of the orientation of stress at the time of propagation and as such they are also useful records of ancient stress fields, regional and local. Because outcrop and subsurface views of joints are limited, statistical techniques are required to characterize joints and joint sets. Finally, joints are subject to post-propagation stresses that further localize deformation and are the focus for the development of new structures.