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《Acta Petrologica Sinica》 2016-06
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Brittle and semi-brittle fractures of antigorite serpentinite in triaxial compression

SHAO TongBin;SONG MaoShuang;LI JianFeng;ZHANG GuiNan;XIA Ying;State Key Laboratory of Isotope Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
Deformation experiments on antigorite serpentinites at confining pressures of 100 ~ 400 MPa,temperatures of 25 ~ 700℃,and strain rates of 10~(-5)~ 1. 5 × 10~(-6)s~(-1)indicate that semi-brittle and brittle fractures take place,respectively,at high pressures( or /and dehydration conditions) and low pressures. Gradual and dramatic decreases in strength of samples are observed in the absence and presence of dehydration,respectively,with the increase of temperature. The preheating time has a more important effect on the strength under high temperatures( e. g.,600℃) where antigorite may dehydrate during the experiment than under low temperatures( e. g.,550℃) which are too low to enable dehydration in our laboratory experiments. Combined and compared with previous studies,we found that increasing confining pressure leads to increase in the strength at room temperature but to the overall trend of decreasing strength in the presence of dehydration,probably due to the partial loss of cohesive strength and the increase of ductility. The ductility of fault surface can increase with temperature,confining pressure,and fluid content on fault surface increasing,resulting in friction coefficient decreasing. Antigorite,which is not yielded even after differential stress exceeded ca. 600 MPa at high temperatures( ca.600℃) and ca. 1000 MPa at low-moderate temperatures( ≤ 400℃),has a strength much stronger than that of low temperature serpentines( e. g.,lizardite and chrysotile). Surprisingly,dehydration embrittlement,a classic hypothesis proposed for generating intermediate-depth earthquakes,is not observed for dehydrating antigorite in our laboratory. Dehydration of antigorite in subduction zones may therefore induce seismogenic failure in the brittle wall rocks rather than in the dehydrating serpentinite itself.
【Fund】: 国家自然科学基金项目(41174072;41090373 40772029);; 中国科学院知识创新工程重要方向项目(KZCX2-YW-Q08-03-4);中国科学院战略性先导科技专项(B类)(XDB18010402)联合资助
【CateGory Index】: P588.323
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