河北涞源祁家峪剖面寒武系层序地层划分

发布时间：2018-02-26 06:07

本文关键词： 寒武系层序地层祁家峪剖面淹没不整合　出处：《大庆石油地质与开发》2017年06期 　论文类型：期刊论文

【摘要】：河北涞源祁家峪剖面寒武系出露连续,层序界面清楚且沉积现象丰富,是进行华北地台寒武系层序划分的较为典型的剖面之一。在新的寒武系年代地层框架下,依据地层的叠置形式、纵向上的沉积相变化及其内部的旋回特征,将该剖面寒武系划分为8个三级层序。结果表明:研究区域从馒头组、毛庄组的"TST+HST"沉积序列转变为"CS+HST"的淹没不整合型层序序列,反映出从混积潮坪沉积序列向缓坡型碳酸盐台地的演化过程,也意味着华北地台寒武系碳酸盐台地从发展阶段向成熟阶段的重大转变;该剖面芙蓉统内部的竹叶状灰岩与长山组顶部、凤山组第1个三级层序顶部发育的均一石生物丘代表了华北地台寒武系末期"贫乏骨骼的风暴海"以及"随着后生动物辐射,微生物碳酸盐岩也在增加"两大特殊沉积现象较为典型的沉积样式。基于层序地层框架内的沉积相叠加方式和地层记录中旋回特征的描述,对河北涞源祁家峪剖面进行层序地层划分,将为探索华北地台在太行山北缘广泛分布的寒武系提供参考实例,也为今后更大区域范围的对比研究提供线索。
[Abstract]:The Cambrian series in the Qijiayu section of Laiyuan, Hebei Province, is one of the typical sections of Cambrian sequence division in North China platform, with a clear sequence interface and abundant sedimentary phenomena. Under the new framework of Cambrian chronostratigraphy, The Cambrian in this section is divided into eight third-order sequences according to the stratigraphic overlay, the longitudinal sedimentary facies changes and the internal cycle characteristics. The results show that the study area is from the steamed bread formation. The "TST HST" sedimentary sequence of the Maozhuang formation is transformed into the inundation and non-integrated sequence sequence of "CS HST", which reflects the evolution process from the mixed tidal flat sedimentary sequence to the gentle slope carbonate platform. It also means that the Cambrian carbonate platform of the North China platform has changed greatly from the development stage to the mature stage, and the bamboo leaf limestone and the top of Changshan formation in the Furong Series in this section, The homogeneous stone dune developed at the top of the first third-order sequence of the Fengshan formation represents the "depleted storm sea" and "with the radiation of epizoa" at the end of the Cambrian in the North China platform. Microbial carbonate rocks are also adding "two typical sedimentary styles of special sedimentary phenomena." based on the sedimentary facies stacking pattern within the sequence stratigraphic framework and the description of cycle characteristics in stratigraphic records, The sequence stratigraphic division of Qijiayu section in Laiyuan, Hebei Province, will provide a reference example for exploring the Cambrian widely distributed in the northern margin of the Taihang Mountains by the North China platform, as well as a clue for the further study of the correlation in a larger area in the future.
【作者单位】：中国地质大学地球科学与资源学院;大庆油田有限责任公司第一采油厂;中国地质调查局油气资源调查中心;National
【基金】：国家自然科学基金项目“华北克拉通北缘寒武纪生物丘沉积组构多样性研究”(41472090,40472065)
【分类号】：P618.13

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