| 拉分盆地与海原断裂带新生代水平位移规模 |
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| 引用本文： | 田勤俭,丁国瑜,申旭辉.拉分盆地与海原断裂带新生代水平位移规模[J].中国地震,2001,17(2):167-175. |
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| 作者姓名： | 田勤俭 丁国瑜 申旭辉 |
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| 作者单位： | 中国地震局分析预报中心,中国北京,100036 |
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| 基金项目： | 本研究得到国家自然科学基金(49732095)和国家重点基础研究发展规划项目"大陆强震机理与预测"(95130102)资助. |
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| 摘 要： | 沿海原断裂带发育3个级别的拉分盆地,其中,发育于中新世的老龙湾盆地是规模最大的拉分盆地,长度超过50km。为了估计盆地拉分量,本文建立了数学模型,相关参数包括盆地沉积厚度、盆地长度、滑脱面深度等。计算得到老龙湾盆地的拉分量为30km。对于另外两个较小规模的拉分盆地,本文利用前人资料和平均走滑速率方法得到盆地拉分量分别为22km和8km。这样,沿海原断裂带新生代以来的拉分总量约60km。该数值与景泰至靖远的黄河位错量接近。
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| 关 键 词： | 水平位移 拉分盆地 海原断裂带 数学模型 新生代 |
Pull-apart Basins and the Total Lateral Displacement along the Haiyuan Fault Zone in Cenozoic |
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| Tian Qinjian Ding Guoyu Shen Xuhui.Pull-apart Basins and the Total Lateral Displacement along the Haiyuan Fault Zone in Cenozoic[J].Earthquake Research in China,2001,17(2):167-175. |
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| Authors: | Tian Qinjian Ding Guoyu Shen Xuhui |
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| Abstract: | Pull-apart basins of three scales were found in Haiyuan fault zone.The largest one is more than 50km long,named Laolongwan basin developed in Miocene.A model was built to calculate the amount of pull-apart of an extensional basin.Parameters used in calculations include thickness and length of deposition and depth of detachment.The results of calculations show that the amount of pull-apart of the Laolongwan Basin is about 30km.Based on previous studies and calculation by average slip rate,amount of pull-apart of the other two smaller scale basins are 22km and 8km.Thus,the total displacement of strike-slip along the Haiyuan fault zone is about 60km which is close to the offset of the Yellow River from Jingtai to Jingyuan. |
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| Keywords: | Lateral displacement Pull-apart basin Haiyuan fault zone |
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