安徽霍山戴家院西周-春秋晚期文化层物质变形的显微分析及其意义
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摘要
皖西霍山戴家院西周-春秋晚期遗址发掘调查中,发现了与构造运动有关的地裂缝,其中充填有粉细砂,初定为地震液化遗迹。从变形物质的定向微观分析中发现了大量显微级地震遗迹标志,如负荷构造,流动构造,截断面,有机质悬浮,等等。这些发现和认识从微观角度验证了遗址所在地区西周-春秋晚期曾发生两次地震事件。上述工作在一定程度上丰富和发展了对我国东部地区史前地震事件的识别和研究方法。
In the excavation surveying to Daijiayuan vestige in the Western Zhou Dynasty-Late Spring and Autumn Period at Huoshan in Western Anhui,ground crack related to tectonic movement was found filled in powder fine sand.This phenomena was confirmed initially to seismic liquefaction.A lot of microscopic seismic relics,such as load structure,flow structure,truncation plane,organic matter suspend,and so on,were found during directional microscopic analysis to the deformation.These findings prove that there were two earthquakes in the Western Zhou Dynasty-Late Spring and Autumn Period at the area.The work enriches and develops research methods to identify prehistoric earthquake event in Eastern China area to a certain extent.
In the excavation surveying to Daijiayuan vestige in the Western Zhou Dynasty-Late Spring and Autumn Period at Huoshan in Western Anhui,ground crack related to tectonic movement was found filled in powder fine sand.This phenomena was confirmed initially to seismic liquefaction.A lot of microscopic seismic relics,such as load structure,flow structure,truncation plane,organic matter suspend,and so on,were found during directional microscopic analysis to the deformation.These findings prove that there were two earthquakes in the Western Zhou Dynasty-Late Spring and Autumn Period at the area.The work enriches and develops research methods to identify prehistoric earthquake event in Eastern China area to a certain extent.
引文
姚大全、朔知、沈小七等,2009,安徽霍山戴家院遗址自然变形遗迹的发现及其特征初探,地球物理学进展,24(6)(印刷中)
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Obermeier S F.,1996,Use of liquefaction-induced features for paleoseismic analysis—An overview of how seismic liquefaction featurescan be distinguished from other features and how their regional distribution and properties of source sediment can be used to infer thelocation and strength of Holocene paleo-earthquake,Engineering Geology,44:1~76.
Vittori E,Labini S S,Serva L.,1991,Palaeoseismology:Review of the state-of-the-art,Tectonophysics,193:9~32.
Bartholomew M J,Stickney M C,Wilde E M,et al.,2002,Late Quaternary paleoseismites:Syndepositional features and sectionrestoration used to indicate paleoseismicity,Atlantic Coastal Plain,South Carolina and Georgia.In:Ettensohn F R,Rast N,Brett CE(eds).Ancient Seismites.Geol Soc Amer Special Paper 369.Boulder,Colorado,U S A.63~74.
Davenport C A,Ringrose P S.,1987,deformation of Scottish Quaternary sediment sequences by strong earthquake motion.In:Jones ME,Preston R M F(eds).Deformation of Sediments and Sedimentary Rocks.Geol.Soc London,Spec Publication 29.299~314.
Moretti M,Brodie B M,Willoughby R H,et al.2002,Late Pleistocene soft-sediment deformation structures interpreted as seismites inparalic deposits in the City of Bari(Apulian foreland,southern Italy).In:Ettensohn F R,Rast N,Brett CE(eds).AncientSeismites.Geol Soc Amer Special Paper 369.Boulder,Colorado,U S A.75~86.
Obermeier S F.,1996,Use of liquefaction-induced features for paleoseismic analysis—An overview of how seismic liquefaction featurescan be distinguished from other features and how their regional distribution and properties of source sediment can be used to infer thelocation and strength of Holocene paleo-earthquake,Engineering Geology,44:1~76.
Vittori E,Labini S S,Serva L.,1991,Palaeoseismology:Review of the state-of-the-art,Tectonophysics,193:9~32.
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