Tribochemical wearing in S-C mylonites and its implication to lithosphere stress level
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- Nakamura Norihiro
- Research Center for Higher Education, Tohoku University
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- Nagahama Hiroyuki
- Institute of Geology and Paleontology, Tohoku University
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- Tachibana Kenji
- Research Center for Higher Education, Tohoku University
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- Satake Yoshimi
- Research Center for Higher Education, Tohoku University
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抄録
A new approach for revealing the brittle origin of C-surfaces as localized high shear strain zones in S-C mylonites (mylonites with C-surfaces cutting through a mylonitic S-foliation) is presented. A compiled worldwide catalog of width (W) and displacement (D) data for shear zones indicates that ductile mylonites show a constant W/D ratio of 10-0.3 and ratios of brittle ‘cataclasites’ vary in magnitude from 10-1 to 10-3, implying that the ratio is a diagnosis for discriminating ductile and brittle shear zones. A newly measured W-D data of shear displaced minerals along C-surfaces in granitic S-C mylonites from the Hatagawa shear zone in northeast Japan is added on the worldwide W-D catalog, being plotted on a brittle origin with the high W/D ratio of 10-1.5. Using this result and a tribochemical wear theory which accounts for wear formation under hydrothermal conditions, C-surfaces in the S-C mylonite might have been formed by cataclastic deformation under the lithosphere stress level of ca. 300 MPa at temperature of 400°C with water for granite. This result suggests a high lithosphere stress level at the depth of the S-C mylonite formation where deformation is predominantly plastic.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 54 (11), 1103-1108, 2002
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681488782592
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- NII論文ID
- 10010125338
- 130003780842
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- NII書誌ID
- AA11211921
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- COI
- 1:CAS:528:DC%2BD3sXht1Srsr0%3D
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 6396889
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可