济阳坳陷东北部中生代构造运动和火山活动及盆地演化
|
摘要
济阳坳陷东北部中、新生界可划分为上、中、下三个构造层，下、中侏罗统坊子组属下构造层；上侏罗系至白垩系为中构造层，又可细分为三卜构造亚层；新生界下第三系为上构造层．中生代的盆地演化划分为早、中侏罗世大型坳陷和褶陷成盆期和晚侏罗世至白垩纪断陷成盆期两个阶段，晚侏罗世晚期至早白垩世为强烈断陷期．中生代的构造样式以宽缓的褶曲和张性正断层为主，其中下构造层以北东向大型褶曲和北西向较平直的正断层为主；中构造层以宽缓的北西向褶曲和北东向铲形正断层为主，燕山Ⅱ幕、Ⅳ幕和Ⅴ幕在本区有重要影响．中生代的火山活动始于晚侏罗世，于早白垩世晚期停止活动，喷发物呈钙碱性，有两个喷发旋回，每一旋回由爆发开始，喷溢结末，早期偏中性，晚期偏基性，中生代盆地与构造的形成主要受郯庐断裂带活动方式控制．
The Mesozoic and Cenozoic erathem in the northeast of Jiyang depression canbe divided into three tectono-stratigraphic sequences,i.e,lower,middle and uppersequences. The Fangzi formation of lower and middle Jurassic series belongs to the lowersequence and consists mainly of coal-bearing terrigenous elastics assemblage deposited in majordepressions and downwarped basins. The middle sequence deposited in faulted depressionincludes three structural sub-area. The structural type of Mesozoic erathem were chieflymarked by wide and gentle folds and extensional faults. The major floods trending NE andplaner normal faults trending NW occured in lower sequence. The wide and gentle foldstrending NW and Listric normal faults trending NE were in middle sequence. The EpisodeⅡand Ⅳ of Yanshanian movement has an important influence to the studied area. The vigorousvolcanism associated with intensive faulted depression occured during the Mengyin andQingshan Periods,and the latter is the most important. In the Mesozoic era, the structures andsedimentations were largely controlled by Tan-Lu fault.
The Mesozoic and Cenozoic erathem in the northeast of Jiyang depression canbe divided into three tectono-stratigraphic sequences,i.e,lower,middle and uppersequences. The Fangzi formation of lower and middle Jurassic series belongs to the lowersequence and consists mainly of coal-bearing terrigenous elastics assemblage deposited in majordepressions and downwarped basins. The middle sequence deposited in faulted depressionincludes three structural sub-area. The structural type of Mesozoic erathem were chieflymarked by wide and gentle folds and extensional faults. The major floods trending NE andplaner normal faults trending NW occured in lower sequence. The wide and gentle foldstrending NW and Listric normal faults trending NE were in middle sequence. The EpisodeⅡand Ⅳ of Yanshanian movement has an important influence to the studied area. The vigorousvolcanism associated with intensive faulted depression occured during the Mengyin andQingshan Periods,and the latter is the most important. In the Mesozoic era, the structures andsedimentations were largely controlled by Tan-Lu fault.
引文
1陈丕基等．山东中生代陆相地层问题，地层学杂志，1980，4（4）2山东省区域地层表编写组。华东地区区域地层表山东省分册。北京：地质出版社，19873刘训．对中国东部燕山运动的一些认识。地质论评，1986．28（5）4郭振一。沂沭断裂带的基本特征及其活动方式。构造地质论丛3，北京：地质出版社，19845国家地震局地质研究所。郯庐断裂。北京：地震出版社；19876徐嘉炜。郯庐断裂带研究的十年回顾，地质论评，1992，38（20）7贾东等。鲁东联合地体的走滑拼贴构造研究。现代地质研究文集，南京大学出版社，19928WoodcookNH，FischerM．StrikeSlipDuplex．JournalofStructuralGeology，1986．8（7）
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心