Frictional Sliding of Pyroxene and Plagioclase Gouges in Gabbro Under Elevated Temperature and Dry Condition

详细信息   

• 责任者：Tan Wenbin (State Key Laboratory of Earthquake Dynamics ; Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; He Changrong
• 刊名：Earth Science Frontiers
• 出版年：2008
• 卷期：15(3)
• 关键词：斜长石 ; plagioclase ; 辉石族 ; pyroxene group
• 页码：p.279-289
• 图表：10 illus., 1 table, 23 refs.
• 分类号：0700
• issnNo：ISSN1005-2321
• isbnNo：CN11-3370/P

摘要

///On the basis of a previous study on gabbro gouge and focusing on plagioclase and pyroxene, the major mineral constituents of gabbro, the authors conducted three series of experiments on frictional sliding of mineral gouges with temperature up to 617℃ and normal stress at or around 300 MPa under different loading conditions in order to explore the effects of different minerals on the frictional sliding behavior. The following conclusions were drawn from the research results: 1) while the plagioclase gouge is favorable for the velocity-strengthening behavior, the pyroxene gouge tends to be favorable for the velocity-weakening behavior, which should be responsible for the velocity-weakening behavior of gabbro gouge at temperature of 615℃; 2) as seen in gabbro gouge, the friction coefficients of the two gouges in this study have no significant variations with the temperature elevation; and 3) although the quartz proved to be the mineral that controls the sliding behavior of granite under hydrothermal conditions, this may not apply to other rocks in general.