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Can rock magnetic fabric reveal strain? Case studies of Early Triassic limestones from South China Block
Han, YL; Tan, XD; Kodama, KP; xdtan@scsio.ac.cn
2009
发表期刊CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
卷号52期号:10页码:2588-2594
摘要It is generally regarded that magnetic fabrics can effectively reveal strain in rocks. In order to investigate the relationship between different magnetic fabric types and different stages of strain, we conducted a combined analysis of rock magnetics, magnetic fabrics and mesoscopic deformation features for Early Triassic limestones from two areas in the South China Block. Samples from the Tongshan county, Hubei province underwent three stages of deformation, which provided an ideal opportunity to test the relationship between magnetic fabric and multiple deformations. The minimum axes of AMS and AAR ellipsoids are normal to the bedding and the intermediate and maximum axes tie within the bedding, indicating deposition and compaction fabrics having not been affected by tectonic strain. Samples from the Lian county, Guangdong province experienced tectonic strain as evidenced by pervasive pressure solution seams and calcite veins. The principal directions of AMS are scattered, but those of AAR are well clustered showing a triaxial fabric. The maximum axes of AAR are distributed around the maximum stress direction indicated by the geometry of calcite veins. The initial compaction fabric was replaced by tectonic strain. These results suggest: (1) AAR can better reflect pervasive strain than AMS; (2) Only under the condition that the scope of strain is less than that of the sample call magnetic fabric effectively reveal strain.
部门归属[Han Yu-Lin; Tan Xiao-Dong] Chinese Acad Sci, S China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Han Yu-Lin] Chinese Acad Sci, Grad Univ, Coll Earth Sci, Beijing 100049, Peoples R China; [Kodama, Kenneth P.] Lehigh Univ, Dept Earth & Environm Sci, Bethlehem, PA 18015 USA
关键词Limestones Magnetic Fabrics Strain Rock Magnetism
学科领域Geochemistry & Geophysics
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000271403300018
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4594
专题中科院边缘海地质重点实验室
通讯作者xdtan@scsio.ac.cn
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Han, YL,Tan, XD,Kodama, KP,et al. Can rock magnetic fabric reveal strain? Case studies of Early Triassic limestones from South China Block[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2009,52(10):2588-2594.
APA Han, YL,Tan, XD,Kodama, KP,&xdtan@scsio.ac.cn.(2009).Can rock magnetic fabric reveal strain? Case studies of Early Triassic limestones from South China Block.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,52(10),2588-2594.
MLA Han, YL,et al."Can rock magnetic fabric reveal strain? Case studies of Early Triassic limestones from South China Block".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 52.10(2009):2588-2594.
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