地震工程学报2018，Vol.40Issue(1)：86-91,6.DOI:10.3969/j.issn.1000-0844.2018.01.086
离石北部北川河阶地特征及其新构造指示
Characteristics of the Beichuan River Terraces in the North of Lishi Area and Its Neotectonic Indication
摘要
Abstract
The Lvliang Mountain uplift area is located in the west of Shanxi Fault Belt.The extent and the period of the mountain uplift and the river terraces on the mountain have been rarely studied,in particular,after the late Quaternary.In this study,the stratigraphic and geomorpho-logical features of the terraces in the north of Lishi are studied in detail,and the uplift of Lvliang Mountain is also discussed.The river valley of the study area is wide,and the Beichuan River de-velops on the eastern side of the valley.In addition,the east side is narrower and the west side is wider,which is the main human activity area.The width of the valley is about 0.9~1.6 km,and the elevation difference of the valley is small and the surface is flat.The floodplain and the first and second terraces are also widely distributed in the Beichuan River valley.The third terrace is rarely developed in the area.The first-order terrace and river floodplain formed during the Hol-ocene period,the second-order terrace formed in the Late Pleistocene period,and the third-order terrace formed in the Early-Late Pleistocene period.Meanwhile,the third-order terrace is incom-plete,and it has larger height difference than the height difference in the second terrace.The sec-ond-order terrace is narrow and the first-order terrace is relatively wide,and the height difference of the two steps is not remarkable.The first-order terrace is relatively wide and the river flood-plain is relatively narrow,and the height difference between the two is not significantly big.The results show that the mountain has been uplifted three times intermittently since Late Pleisto-cene;in addition,the uplift of the mountain is relatively rapid and intense,and the uplift pro-ceeds in a relatively slow process from the Later-Late Pleistocene to the Holocene periods.关键词
地貌/阶地/山体隆升/新构造Key words
geomorphology/terrace/mountain uplift/neotectonics分类
天文与地球科学引用本文复制引用
扈桂让,曾金艳,赵晋泉,闫小兵,高利敏..离石北部北川河阶地特征及其新构造指示[J].地震工程学报,2018,40(1):86-91,6.基金项目
山西省地震局行业科研专项(SBK-1605) （SBK-1605）
中国地震局地质研究所基本科研业务专项(IGCEA1416) （IGCEA1416）
临汾市区活断层探测与地震危险性评价(1521044025) （1521044025）
