| 景泰老虎山活动断裂地区的第四纪地层的划分与对比研究 |
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| 引用本文： | 刘百篪,吕太乙,袁道阳,刘小凤,何文贵,刘建生.景泰老虎山活动断裂地区的第四纪地层的划分与对比研究[J].西北地震学报,1994,16(4):54-62. |
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| 作者姓名： | 刘百篪 吕太乙 袁道阳 刘小凤 何文贵 刘建生 |
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| 作者单位： | 国家地震局兰州地震研究所 |
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| 摘 要： | 老虎山地区的第四系以山麓洪积与山区河流阶地沉积为主，￣１４Ｃ法、ＴＬ法和扩散方程法测定的近４０个年代样品表明：Ⅰ级阶地为全新统，阶地形成年龄为４０８６±１００ａ—４５７８±６０ａ；Ⅱ级阶地为晚更新世晚期沉积，阶地形成年龄为２３Ｋａ；Ⅲ级阶地为晚更新世早中期沉积，阶地形成年龄为７２Ｋａ；Ⅳ级阶地和Ⅴ级阶地为中更新世沉积，其阶地形成年龄分别为２１７±３５Ｋａ和３７８±６０Ｋａ；早更新统仅在局部出露，可能属早更新世早期的沉积。通过与兰州九洲台黄土剖面对比，发现Ⅰ—Ⅴ级阶地的形成年龄与标准剖面中的Ｓｏ、Ｓ＿２、Ｓ＿４等层古土壤形成年龄相一致。这说明河流层状地貌的形成。除了与构造抬升有关外，还与全球冷暖交替的大气候背景有着十分密切的内在联系
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| 关 键 词： | 老虎山断裂，第四纪地层，九洲台黄土剖面，古土壤，阶地 |
| 收稿时间： | 1993/9/15 0:00:00 |
STUDY ON THE DIVISION AND CORRELATION OF QUATERNARY STRATAIN IN LAOHUSHAN ACTIVE FAULT AREA,JINGTAI COUNTY,GANSU |
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| Liu Baichi,Lu Taiyi,Yuan Daoyang,Liu Xiaofeng,He Wengui and Liu Jiansheng.STUDY ON THE DIVISION AND CORRELATION OF QUATERNARY STRATAIN IN LAOHUSHAN ACTIVE FAULT AREA,JINGTAI COUNTY,GANSU[J].Northwestern Seismological Journal,1994,16(4):54-62. |
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| Authors: | Liu Baichi Lu Taiyi Yuan Daoyang Liu Xiaofeng He Wengui and Liu Jiansheng |
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| Institution: | Earthquake Research Institute of Lanshou, SSB, Lanzhou 730000,Earthquake Research Institute of Lanshou, SSB, Lanzhou 730000,Earthquake Research Institute of Lanshou, SSB, Lanzhou 730000,Earthquake Research Institute of Lanshou, SSB, Lanzhou 730000,Earthquake Research Institute of Lanshou, SSB, Lanzhou 730000 and Earthquake Research Institute of Lanshou, SSB, Lanzhou 730000 |
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| Abstract: | The Quaternary strata in Laohushan area are mainly the torrenthial diluvium and river ter-race deposits,the ages of nearly 40 samples determined by14C,TL and diffusion equation meth-ods indicate that:the first terrace formed in Holocene, its age is about 4086±100a-4578±60a;the second terrace formed in late period of Late-Pleistocene,its age is about 23ka;the third terrace formed in early period of Late-Pleistocene,its age is about 72ka;the forth and fifth terraces formed in Middle-Pleistocene,their ages are about 217±35ka and 378±60ka,re-spectively. The deposits of Early-Pleistocene distribute only in some areas.perhaps formed in the early period of Early-Pleistocene.By comparison with the loess profile at Jiuzhoutai of Lanzhou, the ages of I-V terraces are compatible with the ages of So,Sma,Smc,S2,S4 paleosoils in the standard profiles. The re-search results indicate that the formation of stratified landforms of rivers is associated with the tectonic movement,meanwhile,has a very closely inner relation to the global cold-warm alter-nation climate environment. |
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| Keywords: | Laohushan fault Quaternary stratum Jiuzhoutai loess profile Paleosoil Terrace |
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