四川龙门山地区泥盆系小岭坡组的沉积环境及古地理演化

本科毕业设计（论文）题目四川龙门山地区泥盆系小岭坡组的沉积环境及古地理演化院(系)资源环境学院专业名称资源勘查工程年级班级2011级1班学生姓名伍顺利指导教师张立军2015年5月25日河南理工大学本科毕业论文摘要I摘要本文的目的在于研究四川龙门山地区泥盆系小岭坡组的沉积环境及古地理演化特点。论文的内容主要包括以下四个部分：四川盆地区域地质概况、龙门山地区泥盆系小岭坡组的岩性岩相以及化石特征、龙门山地区泥盆纪沉积岩相古地理演化特征和结论。通过对龙门山地区泥盆纪的岩层岩性和生物化石特征的研究，绘制出研究区的地层柱状图；通过对龙门山地区泥盆纪海平面升降史和构造演化史的研究，绘制出研究区的海平面升降图。结合地层柱状图和海平面升降图以及其他相关资料最终给出龙门山地区泥盆系小岭坡组的沉积环境及古地理演化特征。通过研究，本文最终得到以下主要成果。一、小岭坡组总厚度为265m，岩性主要为生物屑泥晶灰岩、藻纹灰岩以及礁灰岩等。具有鸟眼构造和潮汐层理等，含有腕足类和层孔虫等生物化石。二、小岭坡时期主要是稳定的碳酸盐台地沉积，主要的沉积相有淡化泻湖相、潮坪相、台地泻湖和补钉礁相。同时就整个龙门山地区而言，在泥盆纪主要经历了平驿铺旋回、甘溪旋回和沙窝子旋回。就小岭坡组而言，经历了沙窝子旋回。关键词：龙门山地区；泥盆纪；生物化石；沉积环境及古地理；小岭坡组河南理工大学本科毕业论文AbstractIIAbstractThepurposeofthispaperistostudytheDevoniansystem’ssedimentaryenvironmentandancientgeographicevolutioncharacteristicsofxiaolingpogroupinsichuanlongmenmountainregion.Papermainlyincludesthefollowingfourparts:theregionalgeologicalsurveyofsichuanbasin,lithologicalfaciesandfossilcharacteristicsofxiaolingpogroupinDevoniansystemoflongmenmountainregion,thelithofaciespalaeogeographicevolutioncharacteristicsinDevonianperiodoflongmenmountainregionandconclusion.ThroughtothestudyoflithologyandfossilcharacteristicsinDevonianperiodoflongmenmountainregiontomapthestratigraphiccolumninthestudyarea;Throughtothestudyofsea-levelchangehistoryandstructuralevolutionhistoryinDevonianperiodoflongmenmountainregiontomapthesea-levelchangefigureinthestudyarea.ThenderivesedimentaryenvironmentandpaleogeographicevolutioncharacteristicsofxiaolingpogroupinDevoniansystemoflongmenmountainregionfromcombiningwithstratigraphiccolumnandsea-levelchangefigure,aswellasotherrelevantinformation.Throughtheresearch,finallygetthefollowingmainachievementsinthispaper.First,xiaolingpogroup’stotalthicknessis265mandthemainlithologyarethebiologicalchipmicrite,algallimestoneandreeflimestone,etc.Havingbird-eyestructureandtidalbedding,etc.Containingbrachiopodsandlayerforamfossils,etc.Second,xiaolingpoperiodismainlystablecarbonateplatformdeposits.Themainsedimentaryfaciesaredilutelagoonfacies,tidalflatfacies,platformlagoonandpatchreeffacies.Atthesametimeintermsofthewholelongmenmountain,Devonianperiodmainlyexperiencedpingyipucycle,ganxicycleandshawozicycle.Intermsofxiaolingpogroup,hasexperiencedtheshawozicycle.Keywords:longmenshanmountainregion;Devonianperiod;fossils;sedimentaryenvironmentandpalaeogeography;xiaolingpogroup河南理工大学本科毕业论文目录III目录1前言...........................................................................................................................................................11.1研究背景.......................................................................................................................................11.2主要研究内容及路线................................................11.2.1研究内容.............................................................................................................................11.2.2研究路线.............................................................................................................................12四川盆地区域地质概况..................................................32.1四川的地理位置....................................................32.2四川的大地构造位置及地形地貌......................................42.2.1大地构造位置...........................................................42.2.2地形地貌..............................................................52.3四川的区域地层特征................................................52.3.1前震旦系基底.....................................................................................................................62.3.2震旦系（Z）.......................................................................................................................62.3.3寒武系（Є）.......................................................................................................................72.3.4奥陶系（O）.......................................................................................................................72.3.5志留系（S）.......................................................................................................................72.3.6泥盆系（D）.......................................................................................................................82.3.7石炭系（C）.......................................................................................................................82.3.8二叠系（P）.......................................................................................................................82.3.9三叠系（T）.......................................................................................................................92.3.10侏罗系（J）.....................................................................................................................92.3.11白垩系（K）....................................................................................................................92.3.12第三系（E—N）.............................................................................................................102.3.13第四系（Q）.................................................................................................