巢北地区下石炭统沉积环境与古生态恢复
发布时间：2019-06-06 19:07
【摘要】：安徽巢湖北部地区位于下扬子板块北部边缘部分,下石炭统发育良好,分布广泛,沉积特征明显。通过对巢北地区详细的野外测量和系统的岩石学、沉积学、古生态学的研究,尤其是进行碳酸盐岩石微相研究,分析下石炭统是沉积环境特征演化及古生态环境。首先对研究区内下石炭统的野外地层典型剖面进行系统的剖面测量,描述宏观岩石特征及沉积标志,系统地采集样品,在室内对岩石薄片中的显微特征进行观察,尤其是生物碎屑的类型、生屑组合特征等进行了详细的鉴定与描述,在此基础上划分出九种岩石微相。巢湖北部下石炭沉积相模式主要有:开阔台地相模式,对应于金陵组、和州组下部的灰岩部分;潮坪-泻湖-砂坝相模式,对应于高骊山组;淡化极浅水潮坪泻湖相模式,对应于和州组第四旋回、第五旋回顶部;生物碎屑浅滩相模式,对应于和州组第五、六旋回的块状灰岩。通过对地层中的宏体化石、微体化石与生屑组合、遗迹化石的研究,总结了金陵组、高骊山组、和州组的古生态特征,和州组划分出了六种古生态环境。
[Abstract]:The northern Chaohu area of Anhui Province is located in the northern margin of the Lower Yangtze plate. The Lower Carboniferous is well developed and widely distributed, and the sedimentary characteristics are obvious. Based on the detailed field survey and systematic petrology, sedimentology and paleoecology in Chaobei area, especially the study of carbonate rock microfacies, the evolution of sedimentary environment and paleoecological environment of Lower Carboniferous are analyzed. First of all, the typical profile of the Lower Carboniferous field strata in the study area is systematically measured, the macroscopic rock characteristics and sedimentary marks are described, the samples are systematically collected, and the microscopic characteristics of the rock sheets are observed in the laboratory. In particular, the types of bioclastic and the characteristics of bioclastic assemblages are identified and described in detail, on the basis of which nine kinds of rock microfacies are divided. The lower carbon sedimentary facies models in the north of Chaohu Lake are as follows: open platform facies model, corresponding to Jinling formation, limestone part in the lower part of Hezhou formation, Chaoping-lagoon-sand bar phase model, corresponding to Gaolishan formation; The desalination model corresponds to the fourth cycle and the top of the fifth cycle of the Hezhou formation, and the bioclastic shoal pattern corresponds to the massive limestone of the fifth and sixth cycles of the Hezhou formation. Based on the study of macrofossils, microfossils, bioclastic assemblages and trace fossils in strata, the paleoecological characteristics of Jinling formation, Gaolishan formation and Hezhou formation are summarized, and six kinds of paleoecological environments are divided into Hezhou formation.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P512.2;P534.45
[Abstract]:The northern Chaohu area of Anhui Province is located in the northern margin of the Lower Yangtze plate. The Lower Carboniferous is well developed and widely distributed, and the sedimentary characteristics are obvious. Based on the detailed field survey and systematic petrology, sedimentology and paleoecology in Chaobei area, especially the study of carbonate rock microfacies, the evolution of sedimentary environment and paleoecological environment of Lower Carboniferous are analyzed. First of all, the typical profile of the Lower Carboniferous field strata in the study area is systematically measured, the macroscopic rock characteristics and sedimentary marks are described, the samples are systematically collected, and the microscopic characteristics of the rock sheets are observed in the laboratory. In particular, the types of bioclastic and the characteristics of bioclastic assemblages are identified and described in detail, on the basis of which nine kinds of rock microfacies are divided. The lower carbon sedimentary facies models in the north of Chaohu Lake are as follows: open platform facies model, corresponding to Jinling formation, limestone part in the lower part of Hezhou formation, Chaoping-lagoon-sand bar phase model, corresponding to Gaolishan formation; The desalination model corresponds to the fourth cycle and the top of the fifth cycle of the Hezhou formation, and the bioclastic shoal pattern corresponds to the massive limestone of the fifth and sixth cycles of the Hezhou formation. Based on the study of macrofossils, microfossils, bioclastic assemblages and trace fossils in strata, the paleoecological characteristics of Jinling formation, Gaolishan formation and Hezhou formation are summarized, and six kinds of paleoecological environments are divided into Hezhou formation.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P512.2;P534.45
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