| 柴北缘上古生界混合沉积特征及控制因素 |
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| 引用本文： | 陈世悦,毕明威,孙娇鹏,张 跃,庄毓凯,刘 金,汪 峰,马 帅.柴北缘上古生界混合沉积特征及控制因素[J].地质通报,2016,35(203):282-292. |
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| 作者姓名： | 陈世悦 毕明威 孙娇鹏 张 跃 庄毓凯 刘 金 汪 峰 马 帅 |
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| 作者单位： | 1.中国石油大学（华东）地球科学与技术学院，山东 青岛 266580；
2.中山大学地球科学与地质工程学院，广东 广州 510275；
3.西北大学大陆动力学国家重点实验室/地质学系，陕西 西安 710069；
4.中石化江苏油田试采一厂，江苏 扬州 225400 |
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| 基金项目： | 中国地质调查局项目（编号:资[2014]03-025-002、1212011120964-02） |
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| 摘 要： | 柴北缘晚古生代发育多种成因机理各异的混积岩与混积层系。混积岩分为蚀源型砂砾岩，碳酸盐岩-粗陆源碎屑混积岩，泥灰岩(灰泥岩)与含化石泥岩三大类。混积层系在不同环境中均有出现，混积相可划分为混积砂砾质碎屑海岸相、混积低能海岸相、混积台地、混积陆棚4类。在此基础上对各类混积岩、混积层系进行了沉积环境、形成机制解释,归纳出3种不同时期的混积相组合并建立沉积模式。构造运动、海平面升降、气候及古坡角的共同作用导致该区混合沉积普遍发育。其中，加里东构造带的存在及近物源沉积是粗碎屑与生屑颗粒混合的先决条件，海平面频繁变化与极缓的古坡角是该区混积岩、混积层系高频发育的直接原因。
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| 关 键 词： | 柴北缘 上古生界 混合沉积 沉积特征 控制因素 |
Mixed sedimentary characteristics and controlling factors of Upper Paleozoic Group in Northern Qaidam Basin |
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| CHEN Shiyue,BI Mingwei,SUN Jiaopeng,ZHANG Yue,ZHUANG Yukai,LIU Jin,WANG Feng,MA Shuai.Mixed sedimentary characteristics and controlling factors of Upper Paleozoic Group in Northern Qaidam Basin[J].Geologcal Bulletin OF China,2016,35(203):282-292. |
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| Authors: | CHEN Shiyue BI Mingwei SUN Jiaopeng ZHANG Yue ZHUANG Yukai LIU Jin WANG Feng MA Shuai |
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| Abstract: | Various mixed sedimentary rocks and sequences with different formation mechanisms were formed in Late Paleozoic strata of Northern Qaidam Basin. Types of mixed sedimentary rocks can be divided into three categories based on differences in petrology and size: eclipse source conglomerate, mixed sedimentary rock with coarse clastics, marl and lime mud stone, and mudstone with fossils. Mixed sequence formed in every environment, mixed facies can be divided into mixed gritty clastic shore, mixed low-energy clastic shore, mixed carbonate platform, and mixed muddy shelf. Sedimentary models were established based on the analysis. The authors believe that the combined action of tectonic movement, eustatic sea level change, paleoclimate and ancient basin slope angle led to the wide development of mixed sedimentary rocks. The nearby existence of the Caledonian tectonic belt and near-provenance sedimentary rocks are prerequisites for the mixture of coarse-grained clastics and biological detritus. Frequent sea level changes and slow slope toe are the direct causes of highly frequency appearance of mixed rocks and sequences. |
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| Keywords: | Northern Qaidam Basin Upper Paleozoic mixed sedimentary rock sedimentary characteristics controlling factors |
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