灾害学
災害學
재해학
JOURNAL OF CATASTROPHOLOGY
2014年
4期
76-81
,共6页
田勤虎%周本刚%段蕊%卞菊梅%魏青珂
田勤虎%週本剛%段蕊%卞菊梅%魏青珂
전근호%주본강%단예%변국매%위청가
钻孔%联合剖面%渭河断裂东段%光释光年龄%断裂活动速率%地层沉积速率
鑽孔%聯閤剖麵%渭河斷裂東段%光釋光年齡%斷裂活動速率%地層沉積速率
찬공%연합부면%위하단렬동단%광석광년령%단렬활동속솔%지층침적속솔
composite drilling section%east section of Weihe fault%OSL ages%fault activity rate%stratigraph-ic sedimentary rate
综合地形、断裂遥感解译以及钻孔联合剖面,考虑到渭河断裂东段在金家庄、东耳村一带存在一个左阶斜裂区,阶区宽约1 km,将断裂分为杨家村-金家庄段和东耳村-张家湾段,均为同生正断层,全新世有活动。使用研究区的十一条钻孔联合剖面,结合典型断错地层光释光年龄,建立了渭河断裂东段中更新世晚期以来的断裂活动速率曲线。结果显示杨家村-金家庄段全新世活动速率为0.04 mm/a,晚更新世活动速率在0.16~0.40 mm/a之间,中更新世平均活动速率在0.24~0.30 mm/a之间;东耳村-张家湾段全新世平均活动速率为0.12 mm/a,晚更新世活动速率在0.11~0.23 mm/a之间,中更新世平均活动速率在0.19~0.24 mm/a之间。通过与渭河断裂东部地区晚更新世以来的沉积速率曲线对比,在较长时间段里,地层沉积速率大于断裂活动速率,反映了渭河断裂垂向差异运动较弱,以至于隐伏于渭河阶地之下。
綜閤地形、斷裂遙感解譯以及鑽孔聯閤剖麵,攷慮到渭河斷裂東段在金傢莊、東耳村一帶存在一箇左階斜裂區,階區寬約1 km,將斷裂分為楊傢村-金傢莊段和東耳村-張傢灣段,均為同生正斷層,全新世有活動。使用研究區的十一條鑽孔聯閤剖麵,結閤典型斷錯地層光釋光年齡,建立瞭渭河斷裂東段中更新世晚期以來的斷裂活動速率麯線。結果顯示楊傢村-金傢莊段全新世活動速率為0.04 mm/a,晚更新世活動速率在0.16~0.40 mm/a之間,中更新世平均活動速率在0.24~0.30 mm/a之間;東耳村-張傢灣段全新世平均活動速率為0.12 mm/a,晚更新世活動速率在0.11~0.23 mm/a之間,中更新世平均活動速率在0.19~0.24 mm/a之間。通過與渭河斷裂東部地區晚更新世以來的沉積速率麯線對比,在較長時間段裏,地層沉積速率大于斷裂活動速率,反映瞭渭河斷裂垂嚮差異運動較弱,以至于隱伏于渭河階地之下。
종합지형、단렬요감해역이급찬공연합부면,고필도위하단렬동단재금가장、동이촌일대존재일개좌계사렬구,계구관약1 km,장단렬분위양가촌-금가장단화동이촌-장가만단,균위동생정단층,전신세유활동。사용연구구적십일조찬공연합부면,결합전형단착지층광석광년령,건립료위하단렬동단중경신세만기이래적단렬활동속솔곡선。결과현시양가촌-금가장단전신세활동속솔위0.04 mm/a,만경신세활동속솔재0.16~0.40 mm/a지간,중경신세평균활동속솔재0.24~0.30 mm/a지간;동이촌-장가만단전신세평균활동속솔위0.12 mm/a,만경신세활동속솔재0.11~0.23 mm/a지간,중경신세평균활동속솔재0.19~0.24 mm/a지간。통과여위하단렬동부지구만경신세이래적침적속솔곡선대비,재교장시간단리,지층침적속솔대우단렬활동속솔,반영료위하단렬수향차이운동교약,이지우은복우위하계지지하。
Integrated with the landform remote sensing interpretation and composite drilling section,consider-ing there is a left-stepped,oblique-arranged zone in Jinjia village and Donger village near the Weihe fault with width about 1 km.We divided the east section of Weihe fault into Yangjia village-Jinjia village section and Donger village-Yaodian section.They are both contemporaneous normal faults and Holocene active.Eleven composite drill-ing sections are used in the study area and the typical fault OSL age strata.Fault activity rate curve of late middle Pleistocene of the east section of the Weihe fault is build,which shows that the activity rate of Yangjia village-Jinjia village section in Holocene is 0.04 mm/a,Late Pleistocene is 0.16 to 0.40 mm/a,Middle Peistocene is 0.24 to 0.30 mm/a.The activity rate of Donger village-Zhangjiawan section in Holocene is 0.12 mm/a,Late Pleistocene is 0.1 1 to 0.23 mm/a,Middle Peistocene is 0.19 to 0.24 mm/a.Contrast with the deposition rate curve of late middle Pleistocene of the east section of the Weihe fault.Stratum deposition rate is greater than fault activity rate in a long time.And it is shown that the Vertical differential movement is weaker of Weihe fault.So it blind in the Weihe terrace.