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《中国科学院地质与地球物理研究所2006年论文摘要集》2007年
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Structural Interpretation of Extensional Deformation along the Dali fault System,SE Margin of the Tibetan Plateau

【摘要】:正The Dali fault system is a prominent active tectonic feature along the southeastern 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 Chenghai,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, oriented NE-SW.To 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 young to 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 Lijiang basins.Similarly,NE-SW directed normal faulting along northern and southern boundaries of the Diancang Shan massif resulted in uplift of the massif and subsidence of the Qiaohou and Eryuan 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 the Chenghai fault resulted in subsidence of the Binchuan Basin, which preserves an early to middle Pleistocene sedimentation record.Finally,NE-SW directed normal faulting along the southern end of the Chenghai fault and the northern boundary of the Diancang Shan massif resulted in crustal shortening along the Nancun thrust-fold belt.All these geological arguments indicate that left-lateral movement along the southern segment of the Chenghai,Heqing and Heihuijiang fault has been largely transferred into both transtensional and transpressional motion,resulted in 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 on 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 Pliocene 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.
【分类号】:P542.3

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