| 冲积-河流相层序地层模式--以济阳坳陷新近系为例 |
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| 引用本文： | 国景星.冲积-河流相层序地层模式--以济阳坳陷新近系为例[J].新疆地质,2003,21(4):393-397. |
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| 作者姓名： | 国景星 |
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| 作者单位： | 石油大学(华东)地球资源与信息学院,山东,东营,257061 |
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| 摘 要： | 从层序边界分析人手，对层序类型体系域类型等进行了研究，认为冲积-河流相地层体系域划分具4分性，即发育有低位体系域、扩张体系域、高位体系域，当基准面缓慢下降时，还可发育收缩体系域．同时，根据济阳坳陷新近系沉积特征，指出各体系域对应的沉积体系及相类型，认为低位体系域以侵蚀下切、冲积扇．辫状河沉积为主；扩张体系域由辫状河向曲流河过渡；高位体系域时期以曲流河为主．其次，根据构造演化、古气候变化、古地形等研究认为，尽管新近纪济阳坳陷进入坳陷发育时期，断裂活动明显减弱，但是构造运动对层序发育仍有一定影响；根据古气候分析认为，新近纪经历了北亚热带温湿气候，中亚热带温湿气候，北亚热带干旱气候等阶段．这种气候变化导致了馆陶组沉积早、中期河流纵横交错，辫状河道发育，馆陶组沉积后期逐渐向曲流河过渡；明化镇组沉积期河道相对不发育．由古地形及物源供给分析，认为古地形差异的变化与物源供给对济阳坳陷新近系层序发育、层序样式等有一定程度影响．
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| 关 键 词： | 冲积-河流相 层序地层 坳陷 体系域 构造运动 |
| 文章编号： | 1000-8845(2003)04-393-05 |
| 修稿时间： | 2002年12月16 |
THE MODE OF SEQUENCE STRATUM OF ALLUVIAL-FLUVIAL FACIES--TAKING THE UPPER TERTIARY OF JIYANG DEPRESSION FOR EXEMPLE |
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| GUO Jing-xing.THE MODE OF SEQUENCE STRATUM OF ALLUVIAL-FLUVIAL FACIES--TAKING THE UPPER TERTIARY OF JIYANG DEPRESSION FOR EXEMPLE[J].Xinjiang Geology,2003,21(4):393-397. |
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| Authors: | GUO Jing-xing |
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| Abstract: | studying types of sequence and system tract, the author considered that there are 4 types of system tract in alluvial-fluvial facies: Lowstand system tract, extension system tract,highstand system tract, contraction system tract. According to the sedimentary characteristics of the Upper Tertiary in Jiyang Depression, the authors pointed out the types of sediment system and facies corresponded to different system tract: no record, alluvial-braided river facies in Lowstand system tract; fluvial facies in the extension system tract, and braided river in early period, meandering stream in the late period; meandering stream in the highstand system tract; braided river in the contraction system tract.
Secondly, the authors studied the characteristics of structural evolution, paleoclimate evolvement, fossil landscape and so on. Despite fault activity is weak obviously in Neogene , the tectonic movement influenced the sequence development in Neogene, especially in the forepart of Neogene. By resuming the paleoclimate of the Neogene, the author considers it went through 3 periods: warm-humid climate of north subtropical zone, warm-humid climate of middle subtropical zone and arid climate of north subtropical zone. The changes of paleoclimate from warm-wet to arid resulted in the crisscrossing of fluvial channels, rich in braideded rivers during the early and middle period of Guantao Formation. During the late period of Guantao Formation and Minghuazhen Formation, mudstone was widely distributed and the color of mudstone was mainly mauve, redbrown, mottle, fluvial channel was locally distributed. According to analysis of fossil landform and detrital material supply, the development and mode of sequence was influenced, to some extent, by the changes of fossil landform difference and deliverability of detrital material. |
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| Keywords: | Jiyang depression Neogene braided river meandering river system tract |
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