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DOI	10.1029/2008JB005597
	Direct measurement of strain rates in ductile shear zones: A new method based on syntectonic dikes
	Sassier, C.; Leloup, P. H.; Rubatto, D.; Galland, O.; Yue, Y.; Lin, Ding
通讯作者	Sassier, C (通讯作者)
发表日期	2009
ISSN	2169-9313
EISSN	2169-9356
卷号	114
英文摘要	We describe a new method to estimate directly ductile strain rates at an outcrop scale from the deformation of dikes emplaced within a shear zone. The method is tested in a well-constrained shear zone: the Ailao Shan-Red River shear zone, for which global strain rates can be calculated from published fault rates. The strain rate was determined by measuring independently the shear strain (gamma) recorded by the dikes and the age (t) of dikes emplacement. The shear strain was quantified by three different methods that take into account either the stretching of the dikes or their angle variations during deformation or both of them. The values of minimum shear strains range between 0.2 and 9.7 for the less to the most deformed dikes, respectively. The ages of dike emplacement were obtained by Th-Pb sensitive high-resolution ion microprobe (SHRIMP) dating of monazites. We obtained three groups of ages: the younger age is 22.55 +/- 0.25 Ma, the intermediate age is 26.81 +/- 0.66 Ma, and the oldest ages are 29.89 +/- 0.46 Ma and 29.93 +/- 0.38 Ma. The geochronological data are in agreement with the structural data, the most deformed dikes being the oldest. The minimum strain rates deduced from these measurements are 3 to 4 x 10(-14) s(-1), which is consistent with previous estimates of geological strain rates in ductile shear zones.
关键词	SHAN-RED-RIVER SOUTH CHINA SEA AR-40/AR-39 DATING CONSTRAINT LEFT-LATERAL MOVEMENT NAM-DINH AREA STRIKE-SLIP CONTINENTAL LITHOSPHERE INDO-CHINA NORTHEASTERN VIETNAM CENOZOIC TECTONICS
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000262753000001
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257713
推荐引用方式 GB/T 7714	Sassier, C.,Leloup, P. H.,Rubatto, D.,et al. Direct measurement of strain rates in ductile shear zones: A new method based on syntectonic dikes[J]. 中国科学院青藏高原研究所,2009,114.
APA	Sassier, C.,Leloup, P. H.,Rubatto, D.,Galland, O.,Yue, Y.,&Lin, Ding.(2009).Direct measurement of strain rates in ductile shear zones: A new method based on syntectonic dikes.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,114.
MLA	Sassier, C.,et al."Direct measurement of strain rates in ductile shear zones: A new method based on syntectonic dikes".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 114(2009).