CAJ | 학술논문

南祁连山前区可以分为露头和盆地区两个不同的大地构造单元,本区晚中生代构造活动强烈,控制了新生代的沉积过程和现今中生界残余层序的分布.本文提出了均匀平板状沉积体后期的构造变形可以利用占地质图以及高精度残余地层厚度的变化规律判断古构造带的分析方法,并且对于研究区中生代晚期的古构造特征进行了分析.露头区主要利用古地质图分析方法,研究区集中在赛什腾山-埃姆尼克山北缘的鱼卡和红山地区.盆地区主要利用中生界残余厚度图的分析方法,研究区集中在赛什腾山-埃姆尼克山南侧的赛什腾南部凹陷和马海凸起地区.通过这4个地区古构造特征的研究,提出南祁连山前区中生代晚期在区域性隆升的背景下,形成了一系列古构造带,古构造活动的特点是形成北西-北北西走向的背斜和向斜构造,这些褶皱的波长为15～20 km,为中尺度规模.同时指出.中国西部多数地区均缺失上白垩统,暗示着当时的中亚地区存在一个广阔的晚白垩世古高原.
남기련산전구가이분위로두화분지구량개불동적대지구조단원,본구만중생대구조활동강렬,공제료신생대적침적과정화현금중생계잔여층서적분포.본문제출료균균평판상침적체후기적구조변형가이이용점지질도이급고정도잔여지층후도적변화규률판단고구조대적분석방법,병차대우연구구중생대만기적고구조특정진행료분석.로두구주요이용고지질도분석방법,연구구집중재새십등산-애모니극산북연적어잡화홍산지구.분지구주요이용중생계잔여후도도적분석방법,연구구집중재새십등산-애모니극산남측적새십등남부요함화마해철기지구.통과저4개지구고구조특정적연구,제출남기련산전구중생대만기재구역성륭승적배경하,형성료일계렬고구조대,고구조활동적특점시형성북서-북북서주향적배사화향사구조,저사습추적파장위15～20 km,위중척도규모.동시지출.중국서부다수지구균결실상백성통,암시착당시적중아지구존재일개엄활적만백성세고고원.
The front of south Qilian Mt.can be subdivided into two units:outcrop unit and basined unit,and strong tectonic activities,which controlled depositing process in Cenozoic and distribution of present Mesozoic systems,have occurred in Late Mesozoic in this area.This paper proposed a method for analyzing paleo-structural deformation by paleo-geological maps and changing rules of high resolution residual strata thickness,and studies on paleo-structural characteristics in latest Mesozoic in the study area as well.In outcrop area,paleo-geological maps are mainly used,and Yuqia and Hongshan areas,north of Saishiteng Mt.and Aimunike Mt.,are focused;while in basined area,maps of residual Mesozoic thickness are mainy used,and Saishitengnan depression and Mahai uplift at the south of of Saishiteng Mt.and Aimunike Mt.are focused.Based on analysis for paleo-structural characteristics of above four areas,the paper proposed that there developed a series of paleo-structure belts under the background of regional uplifting in latest Mesozoic at the front of south Qilian Mt.,and those paleo-structures are characterized by NW-NNW-striked anticlines and synclines.whose wavelengths are 15～20 km and middle-scaled.At the same time,the paper also points out that most areas in western China are lack of upper Cretaceous,which implies the existence of a broad Late Cretaceous plateau in central Asia.