聚煤期植物作用下的煤系旋回沉积  

The cyclic sedimentation of coal-measure under the action ofplants in the coal-forming period

作　　者：石彦强 SHI Yanqiang(Beijing Dadigaoke Geological Exploration Co.Ltd.,Beijing,100040)

机构地区：[1]北京大地高科地质勘查有限公司,北京100040

出　　处：《地质论评》2023年第4期1285-1297,共13页Geological Review

摘　　要：煤系特征的还原色和突发性、阶段性间断—充填相间的非渐变旋回沉积,明显不同于其他沉积地层。为探究其成因,引用“将今论古”原理,一方面,调查现代植物的生存潜力,植物对地表碎屑的稳固作用,以及植物涵养水源、调节气候等宏观环境效应;另一方面,通过古生物、地层、煤系、煤层、煤质等研究成果,分析地质历史时期植物的发生、发展、繁盛、衰落的演替历程,以及各聚煤期的形成演化。运用比较沉积学方法将二者分阶段不同功能进行类比,经过一系列证据链推演,推导出聚煤期是植物演替更新后发展到鼎盛阶段的产物,当时的植物异常繁盛,具有强劲的拓殖能力和群体效应。各聚煤期植物规模化发展,已经从脆弱的遭受河流、海浪、潮汐等流体的冲刷、改造的被动阶段,回归到主动限制河流的侧蚀、迁移、汇聚,以及压制海浪、潮流的高度,是由个体生存发展为群体效应的过程,是从现代脆弱的植物生态反演到聚煤期强劲的控盆植被系统的依律回溯过程,是植物功能潜力的充分展现,是质的飞跃。聚煤期植被主导下,陆源碎屑库的累积和崩溃,控制盆地碎屑萎缩与扩张、煤系突发间断性沉积,致使煤层向盆缘分岔变薄以致尖灭、煤层中断续沉积角砾岩、同生多阶性带状砂体、陆表海多重障壁体系、约代尔旋回等特殊沉积。聚煤期植物作用的研究,填补了煤地质学空白,能够对煤地质勘查与研究中出现的一些异常现象给予合理的解释。Objectives: To explore the reduction color and the sudden of coal-measures characteristics, periodicdiscontinuity, that is the non-gradual cyclic sedimentation between intermittent and filling phases, as well as thecauses obviously distinct from other sedimentary strata.Methods: Applying " present being a key to past" principle. On the one hand, the survival potential ofmodern plants, the stabilization on surface clastic sediments by the plants, and the macroenvironment effects ofplants on water conservation and climate regulation were investigated;On the other hand, the succession process ofthe occurrence, development, flourishing and withering of plants in the geological time, and the formation andevolution of each coal-forming period on the basis of the research findings (paleontology, strata, coal-measures,coal seams, coal quality, etc )were analyzed. Comparative sedimentology method was used to compare the differentfunctions in each stage of both sides, and a series of evidence chains were deducted.Results: It is deduced that the coal-forming period is the producct of the development of plant succession andrenewal to the peak stage when the plants were extremely flourishing with strong colonizing ability and populationeffect. The large-scale development of plants in each coal-formation period has changed from the passive stage ofbeing vulnerable to the scouring and transformation of rivers, waves, tides and other fluids to actively limiting thelateral erosion, migration and convergence of rivers, and suppressing the heights of waves and tides. It is a processfrom individual survival to group effect and a traceback process in accordance with law from the modern fragileplants ecology to the strong basin-controlling vegetation system in the coal-forming period. It is a full display of plantfunctional potential and a qualitative leap. Under the domination of the vegetation in coal-forming period, theaccumulation and collapse of terrigenous clastic sediments reservoir control the shrinkage and expansion of basinc

关 键 词：聚煤期植物作用 煤系旋回沉积 证据链推演 碎屑库 沼泽河流 沼泽湖 约代尔旋回 

分 类 号：P618.11[天文地球—矿床学]