| 宁波育王山山前断层几何结构及新活动时代 |
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| 引用本文： | 宋方敏,;陈献程,;杨晓平,;宋新初,;王里,;张兰凤,;李陈侠.宁波育王山山前断层几何结构及新活动时代[J].火山地质与矿产,2008(3):177-186. |
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| 作者姓名： | 宋方敏 ;陈献程 ;杨晓平 ;宋新初 ;王里 ;张兰凤 ;李陈侠 |
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| 作者单位： | [1]中国地震局地质研究所,北京100029; [2]浙江省地震局,浙江杭州340013; [3]宁波市科技局,浙江宁波315012 |
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| 基金项目： | 致谢：野外填图期间,汪一鹏研究员、李起彤研究员、叶建青工程师前往现场,对填图工作进行了检查和指导;文中ESR年龄样品由中国地震局地震动力学国家重点实验室尹功明、李建平测试;OSL年龄样品由中国地震局地壳应力研究所释光年代学实验室赵俊香、于慎谔测试.借本文出版之际,向他们表示衷心感谢! |
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| 摘 要： | 根据1：10000条带状地质填图所获资料，分析了育王山山前断层的几何结构和新活动时代。断层北起岙张水库大坝东北，向南经河头蕉-竺家-陈家-钱家-俞家-王家一线以西，止于詹家西南，由2条次级段呈羽列式展布，北段为岙张水库-红岩水库段，南段为红岩水库东南-詹家段。剖面上断层地貌显示清楚，西侧为侏罗系构成的育王山低山，东侧为大楔盆地。各条断层皆由多个断面构成宽几米-几十米的断层带。根据探槽、天然剖面特征和OSL、ESR样品年龄测试结果综合分析，断层至少有两期活动，早期活动性质为逆断层，时间为早更新世，晚期活动性质为右旋走滑兼正断或逆断层，时间为中更新世，最新活动时代为中更新世晚期。通过探槽揭露，确定育王山山前洪积扇陡坎是人类活动造成，而非断层陡坎。
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| 关 键 词： | 山前断层 几何结构 新活动时代 山前洪积扇陡坎 浙江宁波 |
Geometrical structure and neomovement＇s epoch of piedmont fault of Yuwang Mountain in Ningbo,Zhejiang |
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| Institution: | SONG Fang-min, CHEN Xian-cheng,YANG Xiao-ping,SONG Xin-chu, WANG Li ,ZHANG Lan-feng, LI Chen-xia ( 1 Geological Institute, Chinese Seismic Bureau, Beijing 100029, China;2 Zhejiang Seismic Bureaus, Hangzhou 340013, China;3 Ningbo Science and Technology Bureau,Ningbo 315012,China) |
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| Abstract: | On the basis of informations from 1：10000 banded geological mapping, geometrical structure and neomovement＇s epoch of the piedmont fault of Yuwang Mountain have been studied. The fault begins from northeast of Aozhang Reservoir Dam in the north, through the west of the line Hetoujiao-Zhujia-Chenjia-Qianjia-Yujia-Wangjia to the south, ends in the southwest of Zhanjia. There are two plumose secondary faults, the north one is located along Aozhang Reservoir-Hongyan Reservoir, the south one is located along southeast of Hongyan Reservoir-Zhanjia. The geomorphological features of the faults are clear on the section,the Jurassic low mountain of Yuwang Mountain is at the west,the Daxie Basin is at the east. Each fault is composed of several fault surfaces to form a fault belt several meters to several decameters wide. According to the synthesized analysis of prospecting trenches, characteristics of natural sections and dating result of OSL, ESR sample, there are two periods of movement at least. The result of early period movement is to form a reversed fault in early Pleistocene ;the result of later period movement is to form a normal or reversed dextral strike-slip fanlt in middle Pleistocene ;the latest movement is happened in late middle Pleistocene Through exposing by prospecting trenches,it is ascertained that the piedmont pluvial fan＇s steep slope of Yuwang Mountain is formed by human activity,it is not a fault step. |
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| Keywords: | piedmont fault geometrical structure neomovement＇s epoch piedmont pluvial fan＇s steep slope Ningbo Zhejiang |
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