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柴达木盆地古近纪渐新统岩相古地理研究-矿产普查与勘探专业论文 word格式.docx


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摘要
本文在前人研究的基础上,在高分辨率层序地层学理论指导下,结合野外工作及室内分析,对柴达木盆地中期基准面旋回进行了识别和对比,建立了盆地中期基准面旋回地层格架,将古近系渐新统地层划分为 4 个中期基准面旋回,多个短期基准面旋回。精
细的分析了柴达木盆地的沉积相及沉积体系,识别出了 7 大沉积相:冲积扇相、辫状河
相、曲流河相、扇三角洲相、三角洲相、辫状河三角洲相、湖泊相,划分出了 4 大沉积体系:冲积扇-扇三角洲-半深-深湖相沉积体系、河流-三角洲-滨浅湖相沉积体系、冲积扇-辫状河-辫状河三角洲-滨浅湖相沉积体系和冲积扇-冲积平原-洪水-漫湖沉积体系, 并在中期基准面旋回地层格架下分析了其演化。
以中期基准面旋回为编图单元,在系统的分析柴达木盆地物源、古水系、古气候的基础上,恢复了全盆地古近纪渐新世岩相古地理面貌,并探讨了盆地古地理演化的特征。综合来看,古近纪渐新世沉积演化主要是以中央坳陷湖盆逐步扩张为主的过程,但沉积相及沉积体系的分布在不同地区表现不同。冲积扇-扇三角洲-半深-深湖相沉积体系主要分布在盆地西部阿尔金山西段,河流-三角洲-滨、浅湖相沉积体系主要分布在尕斯-跃进地区,冲积扇-辫状河-辫状河三角洲-滨、浅湖相沉积体系主要分布在干柴沟、咸水泉地区,冲积扇-冲积平原-洪水-漫湖沉积体系主要分布在盆地的东部地区。
关键字:柴达木盆地;古近纪渐新世;高分辨率层序地层;岩相古地理
Abstract
On the basis of the seniors' research,guided by high-resolution sequence stratigraphy bined with field investigation and laboratory analysis, this thesis recognized and correlated the mid-term base-level cycles and builded the stratigraphic framework in Qaidam Basin,by analysis, the stratum of Paleogene Oligocene was divided into 4 mid-term base-level cycles and multiple short-term more-refined analysis,this thesis identified 7 sedimentary facies included alluvial fan facies,braided river facies,meandering river facies,fan delta facies,delta facies,braided river delta facies and lake facies,in addition, divided 4 sedimentary systems included alluvial fan-fan delta-half deep-deep lake facies system,river-delta-Littoral and shallow lake facies system,alluvial fan-braided river-braided river delta-littoral and shallow lake facies system and alluvial fan-alluvial plain-flood-overflow lake facies system,and also analyzed the evolution in stratigraphic framework of mid-term cycles.
Based on the analysis of sediment source, palaeocurrent and paleoclimate, this thesis recoverd the lithofacies paleogeography of Paleogene Oligocene and discussed the evolution characteristics. In summary,sedimentary evolution of Paleogene Oligocene was mainly showed up as a central depression lake basin slowly expansived process,but the sedimentary facies and systems were dif

柴达木盆地古近纪渐新统岩相古地理研究-矿产普查与勘探专业论文 word格式 来自淘豆网www.taodocs.com转载请标明出处.

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  • 时间2018-04-19