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	Structural interpretation of extensional deformation along the Dali fault system, southeastern margin of the Tibetan plateau
	Fan, C; Wang, G; Wang, SF; Wang, E
发表日期	2006
ISSN	0020-6814
EISSN	1938-2839
起始页码	287
结束页码	310
卷号	48 期号:4 页码:1135-1147
英文摘要	The Dali fault system is a prominent active tectonic feature. along the southcastern margin of the Tibetan plateau developed between the Three River fold belt and the South China block. It includes three main strands bending eastward, from east to west-the Chellghai. Heqing, and Heihuijiang faults. Quaternary deformation along these strands involves both left-lateral strike slip and normal dip slip. Left-lateral strike slip occurs primarily along southern fault segments orientated NE-SW the north, these faults curve northward, whereas to the South they terminate, against the NW-trending Diancang Shan massif. Our studies of the interaction between these structures and faults along the boundaries of the Diancang Shan massif reveal numerous indications of recent fault slip: such as fault scarps, fault gouge or breccia. syn-tectonic sedimentation, tilting, landslides. and fault-related folds. Kinematic studies indicate that NE-SW-directed normal faulting along middle segments of the Heqing and Heihuijiang faults resulted in relative uplift of the Yulong Shan massif and concomitant Subsidence of the Heqing and basins. Similarly NE-SW-directed normal faulting along the northern Mod Southern boundaries Of the Diancang Shall massif have resulted ill Uplift Of the massif and subsidence of the Qiaohou and Erynan basins. as well as Erhai Lake. The basins preserve a Pliocene and Early, Pleistocene sedimentary record suggesting initiation of the fault system at this time. NE-SW-directed normal faulting along the middle segment of [lie Chenghai fault h as resulted ill subsidence of the Binchuan Basin, which preserves all Early to Middle Pleistocene sedimentation record. Finally, NE-SW-directed normal faulting along the southern end Of the Chellghai fault and the northern boundary of the Shalt massif resulted ill crustal shortening along the Nancun thrust-fold belt. All these geological arguments indicate that left-lateral movement along the southern segments of the Chenghai, Heqing, and Heihuijiang faults have been largely transferred into both transtensional and transpressional motions., resulting ill a characteristic landscape dominated by basins alternating with mountains. Reconstruction of the basin strata indicate that extension across the Heqing and Binchuan basins amounts to 2 and 3.7 km, respectively. Based oil both the shear sense and irregular geometric features of these strands of the Dali fault system, we interpret fault slip to have accommodated clockwise rotation of the intervening blocks, including the Diancang Shan massif, around a vertical axis. Sedimentary and isotopic data Show that rotational movement of the Dali block likely was initiated in the south during Pliotocene time, and subsequently migrated to the north by Early to Middle Pleistocene time. We attribute rotation to N-S right-lateral shear along the southeastern margin of the Plateau, generated by the northward motion of India relative to Eurasia.
关键词	SHEAR ZONE YUNNAN CHINA COLLISION TECTONICS UPLIFT ASIA
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000237229400001
来源期刊	INTERNATIONAL GEOLOGY REVIEW
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/463
推荐引用方式 GB/T 7714	Fan, C,Wang, G,Wang, SF,et al. Structural interpretation of extensional deformation along the Dali fault system, southeastern margin of the Tibetan plateau[J]. 中国科学院青藏高原研究所,2006,48(4):1135-1147.
APA	Fan, C,Wang, G,Wang, SF,&Wang, E.(2006).Structural interpretation of extensional deformation along the Dali fault system, southeastern margin of the Tibetan plateau.INTERNATIONAL GEOLOGY REVIEW,48(4),1135-1147.
MLA	Fan, C,et al."Structural interpretation of extensional deformation along the Dali fault system, southeastern margin of the Tibetan plateau".INTERNATIONAL GEOLOGY REVIEW 48.4(2006):1135-1147.