辽宁浑河断裂带及其邻近地区水系格局构造节理与构造应力场的研究
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摘要
本文根据浑河断裂带及其邻近地区的水系格局、构造节理和地震震源机制解等资料研究该区新构造时期以来的构造应力场。本区在同一地质构造作用下,构造应力场相同,为NEE向。浑河断裂以抚顺市石门岭煤矿区为界,断裂的东南段最新活动时期为261.95±26.05ka.B.P,为中更新世活动断裂,而东北段断裂的最新活动时期为44.7±3.6ka.B.P,表明晚更新世以来仍有活动。在NEE向构造应力场的作用下,北东向的浑河断裂反映为右旋逆冲的运动性质。
This paper presents a comparison analysis on the drainage pattern,tectonic joint,focal mechanism in the Hunhe fault belt and its adjacent areas.It is suggested that there are south and north areas separated by active fault and active tectonic.The direction of principal compression stress is identical,due to the same geologic structure.The direction of principal compression stress is NEE since late Tertiary period in the areas.The results of geological dating of fault gauges along the Hunhe fault zone by thermoluminescent method indicate that the absolute ages of fault activation which produced thermoluminescent effect on the fault gauge are pretty old:261.95±26.05ka.B.P.for the sample in the Funshun First Refinery west of Fushun downtown and 693.0±84.25ka.B.P.for the sample on the eastern margin of downtown(both there corresponds to the middle stage of middle Pleistocene);80.53±16.11ka.B.P.,57.28±11.46ka.B.P.,44.7±3.6ka.B.P.,respectively for the sample furtherly eastward(all of them respond to late Pleistocene).That means the Hunhe fault zone is not an active one as defined by the seismotectonic and engineering-geological circles.
This paper presents a comparison analysis on the drainage pattern,tectonic joint,focal mechanism in the Hunhe fault belt and its adjacent areas.It is suggested that there are south and north areas separated by active fault and active tectonic.The direction of principal compression stress is identical,due to the same geologic structure.The direction of principal compression stress is NEE since late Tertiary period in the areas.The results of geological dating of fault gauges along the Hunhe fault zone by thermoluminescent method indicate that the absolute ages of fault activation which produced thermoluminescent effect on the fault gauge are pretty old:261.95±26.05ka.B.P.for the sample in the Funshun First Refinery west of Fushun downtown and 693.0±84.25ka.B.P.for the sample on the eastern margin of downtown(both there corresponds to the middle stage of middle Pleistocene);80.53±16.11ka.B.P.,57.28±11.46ka.B.P.,44.7±3.6ka.B.P.,respectively for the sample furtherly eastward(all of them respond to late Pleistocene).That means the Hunhe fault zone is not an active one as defined by the seismotectonic and engineering-geological circles.
引文
[1]李衍久.浑河断裂活动性与抚顺城市安全性[M].北京:地震出版社,1994
[2]尹国康.地貌发育的趋向与变异[J].地理学报,1986,41(3):241-253
[3]余庆余,蒋柱中.艾南山(1989)t水系分布方面计算的密集度方法[J].地理科学,1989,5(1):1-10
[4]左键.浑河断裂带区域稳定性评价[J].重庆交通学院学报,2003,22(4):103-107
[2]尹国康.地貌发育的趋向与变异[J].地理学报,1986,41(3):241-253
[3]余庆余,蒋柱中.艾南山(1989)t水系分布方面计算的密集度方法[J].地理科学,1989,5(1):1-10
[4]左键.浑河断裂带区域稳定性评价[J].重庆交通学院学报,2003,22(4):103-107
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