Talc-bearing serpentinized peridotites from the southern Mariana forearc:implications for aseismic character within subduction zones

IOCAS-IR

	Talc-bearing serpentinized peridotites from the southern Mariana forearc:implications for aseismic character within subduction zones
	Wang XM(汪小妹); Ceng ZG(曾志刚); Liu ZH(刘长华); Chen JB(陈俊兵); Yin XB(殷学博); Wang XY(王晓媛); Chen DG(陈代庚); Zhang GL(张国良); Chen S(陈帅); Li K(李康); 欧阳荷根
发表期刊	Chinese Journal of Oceanology and Limnology
ISSN	0254-4059
	2009-08-15
出版年	2009
卷号	v.27 期号:03 页码:249-255
文献类型	CNKI期刊论文
摘要	The serpentinized peridotites overlying the subducted zones in the Izu-Bonin-Mariana(IBM) arc system have been interpret as the cause of the low-velocity layer identified beneath the IBM froearc,in turn few earthquakes occurred along the plate boundary.Chrysotile,which is a low temperature and highly hydrated phase of serpentine with low frictional strength,has been suggested as the low velocity material in the serpentinized peridotites,besides,brucite is inferred to be likely conducive to stable sliding.However,such idea encounters challenging in our serpentinized peridotites from the southern Mariana forearc,which absent both the above minerals.The presence of talc,which characterized by its weak,low-friction and inherently stable sliding behavior,provides new clue.Here we report the occurrence of talc in serpentinized peridotites collected from the landward trench slope of the southern Mariana forearc.We infer that talc is mainly forming as a result of the reaction of serpentine minerals with silica-saturated fluids released from the subducting slab,and talc also occurs as talc veins sometimes.Due to its unique physical properties,talc may therefore play a significant role in aseismic slip in the IBM subduction zone.
关键词	talc serpentinized peridotites Mariana aseismic subduction zone
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A010;A011;
CNKI专题名称	海洋学;地质学;
分类号	P736
收录类别	中科院核心
语种	英文;
资助项目(基金）	Supported by the Pilot Project of Knowledge Innovation Project,Chinese Academy of Sciences (No KZCX2-YW-211,KZCX3-SW-223) ; the National Natural Science Foundation of China (No 40830849) ; the Special Foundation for the Eleventh Five Plan of COMRA (No DYXM-115-02-1-03)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/192494
专题	中国科学院海洋研究所
作者单位	1.KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 2.GraduateSchoolofChineseAcademyofSciences 3.GeologicalBrigadeofHydrogeologyandEngineeringGeology,ZhejiangGeologicalProspectingBureau
推荐引用方式 GB/T 7714	Wang XM,Ceng ZG,Liu ZH,et al. Talc-bearing serpentinized peridotites from the southern Mariana forearc:implications for aseismic character within subduction zones. 2009.