Neotectonic characteristics of the Fl fault in Linyi area in the central segment of the Tan-Lu Fracture-zone, China

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This paper describes some fault outcrops and internal structures of fault rocks along the Fl fault in the Tan-Lu Fracture-zone in Linyi area, Shandong Province, China. The Fl fault zone is composed of two-type fault rocks; one is cataclasites showing complex fold structures and the other is incoherent, foliated fault breccias and gouges. The former is larger than a few tens of meters in thickness, whereas the later is generally less than a few meters in thickness. Foliations and R1 Riedel shear surfaces observed at outcrops are characterized by the alignment of clasts and the development of subsidary shear surfaces. Most clasts included in fault breccias and gouges are rounded or sub-rounded in shape and aligned sub-parallel to the main shear plane (F1 fault plane). They generally show an asymmetry in shape.<BR>The internal structures of incoherent fault rocks and tectonic topogr a phies show that the Fl fault was reactivated in the Late Quaternary as a high-angle reverse or normal fault with some right-lateral strike-slip component, which is different from the previous faulting along the Tan-Lu Fracture-zone before the Quaternary. The relation between the tectonic topographies and the fractured zone suggests that the incoherent cataclastic rocks formed in the Late Quaternary mainly by a high-angle reverse or normal faulting along the old Tan-Lu Fracture-zone.