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A palaeoearthquake event and its age revealed by the travertine layer along the Litang fault in the southeastern margin of the Qinghai-Tibetan plateau

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Earthquake Research Advances 2023年第3期3卷 53-62页

作者： Yao Yang Mingjian Liang Chao Ma Jun Li Hualiang Shen Fang Du Song Luo Shao Liu Xuelian Rui Sichuan Earthquake Agency Chengdu610041China College of Earth Sciences Chengdu University of TechnologyChengdu610059China Zhejiang Earthquake Agency Hangzhou310013China Chengdu Geological Survey Center China Geological SurveyChengdu610081China

The Litang fault(LTF),located in the southeast of the Qinghai-Tibetan Plateau,is known for its high level of present-day seismicity,whereas its Pleistocene activity has been scarcely *** study focused on a tract of banded travertine deposits precipitated from thermal waters along the NW–SE-trending LTF *** role of travertine deposits in recording neotectonic activity has been studied by identifying their internal *** soft-sediment deformation structures observed within the banded travertines include micro folds,liquefied breccia,and liquefied *** deformed structures,which are restricted to a single unit separated unconformably by undeformed layers,can be traced for tens of meters,indicating that they were formed by seismic shaking triggered by LTF *** deformation of the banded travertine layers is attributed to the combined effects of seismic shaking,liquefaction,and fluidization,and it can be related to a paleo earthquake event with a magnitude of MS>*** u-series ages obtained from the banded travertine deposits perturbed by the earthquakes are in the range of 130.59–112.94 ka,indicating an important fault-assisted neotectonic activity that occurred during the Middle–Late *** of such structures,in combination with the use of u-series dating methods,can yield a reliable timing of neotectonic activity and provide new evidence for under-standing the seismotectonic setting of the Litang area.

关键词： Travertine Paleoearthquake Soft-sediment deformation u-series dating Litang fault

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