关于辽西北票组地质时代及区域对比的再讨论
发布时间：2018-07-15 19:38
【摘要】：北票组是辽西侏罗纪主要含煤地层,大部分学者从植物化石角度论述其时代为早侏罗世,区域上与窑坡组、永定庄组、富县组、三工河组对比。本文从地层层序、岩性、构造演化、古气候演化等角度对北票组的地质时代和区域对比进行了讨论,认为该组为印支期后地壳伸展阶段早侏罗世早—中期兴隆沟组火山喷发之后和中侏罗世中晚期海房沟组、蓝旗组燕山期火山活动之前的含煤盆地沉积产物。前者火山活动在冀北、京西形成南大岭组,在北疆三工河组局部形成火山岩夹层;后者火山活动在冀北、京西形成九龙山组、髫髻山组,晋北形成云岗组、天池河组,北疆形成头屯河组。北票组底部杂色地层化石稀少,有机质含量低,气候应相对干热,北票组(杂色地层以上部分)、海房沟组、蓝旗组植物化石和孢粉证明古气候由温湿向干热逐渐演化,而该特征和中国北方以至全球早侏罗世晚期干热、中侏罗世从早期到晚期由温湿向干热的演化规律—致。从而,北票组底部杂色地层属于早侏罗世晚期并和三工河组、富县组、永定庄组、阳眷组、窑坡组底部对比;北票组杂色地层以上部分属于中侏罗世早期,与西山窑组、延安组、大同组、下花园组、窑坡组(K1砂岩以上部分)对比。
[Abstract]:Beipiao formation is the main coal-bearing strata of Jurassic in western Liaoning. Most scholars discuss its age as early Jurassic from the point of view of plant fossils, which is compared with Yaopo formation, Yongding Zhuang formation, Fuxian formation and Sangonghe formation. This paper discusses the geological age and regional correlation of Beipiao formation from stratigraphic sequence, lithology, tectonic evolution and paleoclimate evolution. It is considered that the formation is the product of coal-bearing basins before the volcanic activity of Yanshanian period in the early Jurassic early and middle Jurassic Xinglonggou formation and the middle and late Middle Jurassic Haifanggou formation and the Lanqi formation before the Yanshanian volcanic activity in the post-Indosinian crustal extension stage. The former is formed in the north of Hebei Province, the Nandaling formation in the west of Beijing, and the volcanic rock intercalation in the Sangonghe formation in the northern Xinjiang, while the latter is formed in the north of Hebei Province, the Jiulongshan formation, the Tiaojishan formation, the Yungang formation and the Tianchihe formation in the northern part of Shanxi Province. The formation of Toutunhe formation in northern Xinjiang. At the bottom of the Beipiao formation, the fossils are rare, the organic matter content is low, and the climate should be relatively dry and hot. The fossil plants and sporopollen of the Beipiao formation, Haifanggou formation and Lanqi formation prove that the paleoclimate evolves from temperature and humidity to dry heat. These characteristics are related to the evolution of dry heat from the early Jurassic to the dry heat from the early to the late Middle Jurassic and from the temperature and humidity to the dry heat in the middle Jurassic. Thus, the bottom heterochromatic strata of the Beipiao formation belong to the bottom correlation of the late early Jurassic and Sangonghe formation, Fuxian formation, Yongdingzhuang formation, Yangjiai formation and Yaopo formation, and the upper part of the beipiao formation belongs to the early Middle Jurassic period, and to the Xishanyao formation, Yan'an formation, Datong formation, Xiayuan formation and Yaopo formation (above K 1 sandstone) are compared.
【作者单位】： 河北省煤田地质局;河北省煤田地质勘查院;河北省煤田地质局第四地质队;
【基金】：河北省矿产资源潜力评价项目(编号:121201813003)的成果~~
【分类号】：P535
本文编号：2125167
[Abstract]:Beipiao formation is the main coal-bearing strata of Jurassic in western Liaoning. Most scholars discuss its age as early Jurassic from the point of view of plant fossils, which is compared with Yaopo formation, Yongding Zhuang formation, Fuxian formation and Sangonghe formation. This paper discusses the geological age and regional correlation of Beipiao formation from stratigraphic sequence, lithology, tectonic evolution and paleoclimate evolution. It is considered that the formation is the product of coal-bearing basins before the volcanic activity of Yanshanian period in the early Jurassic early and middle Jurassic Xinglonggou formation and the middle and late Middle Jurassic Haifanggou formation and the Lanqi formation before the Yanshanian volcanic activity in the post-Indosinian crustal extension stage. The former is formed in the north of Hebei Province, the Nandaling formation in the west of Beijing, and the volcanic rock intercalation in the Sangonghe formation in the northern Xinjiang, while the latter is formed in the north of Hebei Province, the Jiulongshan formation, the Tiaojishan formation, the Yungang formation and the Tianchihe formation in the northern part of Shanxi Province. The formation of Toutunhe formation in northern Xinjiang. At the bottom of the Beipiao formation, the fossils are rare, the organic matter content is low, and the climate should be relatively dry and hot. The fossil plants and sporopollen of the Beipiao formation, Haifanggou formation and Lanqi formation prove that the paleoclimate evolves from temperature and humidity to dry heat. These characteristics are related to the evolution of dry heat from the early Jurassic to the dry heat from the early to the late Middle Jurassic and from the temperature and humidity to the dry heat in the middle Jurassic. Thus, the bottom heterochromatic strata of the Beipiao formation belong to the bottom correlation of the late early Jurassic and Sangonghe formation, Fuxian formation, Yongdingzhuang formation, Yangjiai formation and Yaopo formation, and the upper part of the beipiao formation belongs to the early Middle Jurassic period, and to the Xishanyao formation, Yan'an formation, Datong formation, Xiayuan formation and Yaopo formation (above K 1 sandstone) are compared.
【作者单位】： 河北省煤田地质局;河北省煤田地质勘查院;河北省煤田地质局第四地质队;
【基金】：河北省矿产资源潜力评价项目(编号:121201813003)的成果~~
【分类号】：P535
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