豫西禹州地区太原组旋回沉积与海平面变化特征  

Characteristics of cyclic deposition and sea level changes of the Taiyuan Formation in Yuzhou City of western Henan Province

作　　者：宋慧波[1,2] 黄志伟 胡斌 李娟[1] 郑锋利[1] 安红亮 SONG Huibo;HUANG Zhiwei;HU Bin;LI Juan;ZHENG Fengli;AN Hongliang(School of Resources and Environment,Henan Polytechnic University,Jiaozuo,Henan,454000;Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region of Henan Province,Jiaozuo,Henan,454000)

机构地区：[1]河南理工大学资源环境学院,河南焦作454000 [2]中原经济区煤层(页岩)气河南省协同创新中心,河南焦作454000

出　　处：《地质学报》2020年第12期3790-3802,共13页Acta Geologica Sinica

基　　金：国家自然科学基金(编号41772104);河南省基础与前沿(编号162300410256);河南理工大学博士基金(编号B2013-075)联合资助的成果。

摘　　要：豫西禹州地区太原组旋回沉积与海平面变化特征的研究可为华北地区石炭-二叠系煤与煤层气勘探与开发提供沉积背景方面的理论支撑。基于对豫西禹州地区龙华山一带太原组露头剖面的岩性、沉积构造、遗迹化石和沉积序列特征的精细研究,本次工作识别出2种沉积体系(无障壁海岸和有障壁海岸沉积体系)、4种沉积相(包括浅海相、潮坪相、障壁岛相和潟湖相)及3种相组合(浅海相和潮坪相组合,障壁岛、潟湖和潮坪相组合及浅海、潟湖和潮坪相组合)。依据沉积相、沉积体系以及海侵与海退构成的沉积旋回特征,划分出3个大的一级旋回和9个二级旋回。第Ⅰ大旋回由浅海相与潮坪相沉积的4次交替叠加组成;第Ⅱ大旋回由潮坪相→潟湖相→潮坪相→障壁岛相→潮坪相→潟湖相→潮坪相沉积构成;第Ⅲ大旋回表现为浅海相与潮坪相沉积的3次叠加,而后再变为潟湖相沉积。通过沉积旋回与海平面变化的响应关系分析,绘制了相对海平面变化曲线,阐明了本区太原组沉积期旋回沉积与海平面升降变化的基本特征。The study of cyclic deposit and sea level change characteristics from the Taiyuan Formation in Yuzhou city of western Henan Province will provide a theoretical support of deposit setting aspect in exploration and development of the Carboniferous to Permian coal and coal bed gas in North China. On basis of detailed studies of lithologies, sedimentary structures, ichnofossils and depositional sequences in the outcrop section of the Upper Carboniferous to Lower Permian Taiyuan Formation in the area of Longhua hill, Yuzhou city of Western Henan Province, 2 types of depositional systems(no barrier and barrier coasts), 4 kinds of sedimentary facies(shallow marine, tidal flat, barrier island and lagoon facies) and 3 types of facies associations(shallow marine and tidal flat,barrier island, lagoon and tidal flat, shallow marine, lagoon and tidal flat) have been recognized in this work. According to the characteristics of sedimentary facies, depositional systems and sedimentary cycles composed of transgression and regression, the formation was divided into 3 large(first level) cycles and 9 second level cycles. The first large cycle consists of 4 times alternate overlays of shallow marine and tidal flat deposits;The second large cycle is made up of tidal flat→lagoon→tidal flat→barrier island→tidal flat→lagoon→tidal flat facies;The third large cycle manifest as 3 times alternate overlays of shallow marine and tidal flat deposits, and finally changing into lagoon deposit. By analyzing the response relationship between sedimentary cycles and sea level changes, the curve graph of sea level changes was drawn, and the basic feature of cycled deposits and sea level eustacy during the formation depositing was illuminated.

关 键 词：太原组 沉积相 沉积体系 沉积旋回 海平面变化 

分 类 号：P618.13[天文地球—矿床学] P512.2[天文地球—地质学]