松辽盆地嫩江组水成元素地球轨道旋回分析

发布时间：2018-01-29 08:07

  本文关键词： 松辽盆地 米兰科维奇旋回 水成元素 XRF R语言　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：地球轨道旋回是指地球自转与公转的各轨道参数呈现周期性变化的过程,常见于古代沉积记录中,这种地球轨道参数周期性的变化控制着沉积节律。地球表层系统中的生物圈、水圈及大气圈均受地球轨道旋回的影响。它不仅自身表现着节律性,而且通过反馈体系强烈影响着沉积作用。白垩纪是地质历史阶段中一个典型的极端温室气候时期,尤其在晚白垩时期爆发了大量地质事件。但是人们对白垩纪时期的研究主要集中于海相地层,为了更完善地了解白垩纪时期的地质历3史,松科二井(SK-II)在中国东北部开钻。此次研究的主要目的是探究松辽盆地嫩江组中水成元素的米兰科维奇旋回,并且揭示水成元素对其的响应机制,包括湖水内部水成元素的循环以及季风对湖泊环境的影响,由此推断白垩纪时期松辽盆地嫩江组期间的气候的旋回变化。在此主要讨论三类:(1)氧化还原敏感元素:Fe/Ti、S;(2)TOC的埋藏;(3)盐度敏感元素:Sr/Ba。此次研究采用的岩芯来自松科二井嫩一、二段,总长163m(1086m-1249m)。岩芯保存较为连续,并且分别在Fe/Ti、S、TOC、Sr/Ba中识别出良好的米兰科维奇旋回记录,虽然有些元素的信号不连续或不明显,但不影响整体的记录特征。作为良好的氧化剂和还原剂,Fe,S和TOC之间也存在相互影响。通过对比元素计数率与所滤波的波峰波谷间对应关系,我们发现控制松辽盆地湖泊环境的因素主要为岁差,岁差也受偏心率的调制作用。由于米兰科维奇旋回对地球辐射量接收有重要影响,岁差的变化能够控制地球位于近、远日点的位置,因此古湖泊环境及古气候会出现相应的干湿旋回变化。
[Abstract]:Earth orbit cycle is a process in which the parameters of the earth's orbit of rotation and rotation show periodic changes, and are often recorded in ancient sedimentary records. The periodic variation of the Earth's orbital parameters controls the sedimentary rhythm. The biosphere, hydrosphere and atmosphere in the Earth's surface system are all influenced by the Earth's orbital cycle. The Cretaceous is a typical extreme greenhouse climate period in geological history. Especially in the late Cretaceous period, a large number of geological events broke out. However, the study of Cretaceous period is mainly focused on marine strata, in order to better understand the Cretaceous geological calendar 3 history. The main purpose of this study is to explore the Milankovich cycle of the hydrogenic elements in the Nenjiang formation of Songliao Basin and to reveal the response mechanism of the hydrogenic elements to the SK-IIs. It includes the circulation of water elements in lake water and the influence of monsoon on lake environment. The climatic cycle during the Nenjiang formation in the Songliao Basin during the Cretaceous period is inferred. (2) burial of TOC; The salt sensitive element: Sr / P Ba. the core used in this study is from Nen 1 and 2 2 of Songke No. 2 well, with a total length of 163mg ~ 1086 m ~ 1249 m ~ (-1). The core is preserved continuously. Good Milankovich cycles were identified in the Fe / TiTO Stoc Sr / Ba, respectively, although the signals of some elements were not continuous or obvious. As a good oxidant and reducing agent, FES and TOC also influence each other. The correlation between the element counting rate and the filtered peak and trough is compared. We find that the main factors controlling the lake environment in Songliao Basin are precession, which is also modulated by eccentricity. The variation of precession can control the position of the earth at the near and distant heliosphere, so the paleolake environment and paleoclimate will have the corresponding dry-wet cycle change.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P534.53;P532
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本文编号：1472962