本文關(guān)鍵詞： 松遼盆地 米蘭科維奇旋回 水成元素 XRF R語言　出處：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：地球軌道旋回是指地球自轉(zhuǎn)與公轉(zhuǎn)的各軌道參數(shù)呈現(xiàn)周期性變化的過程,常見于古代沉積記錄中,這種地球軌道參數(shù)周期性的變化控制著沉積節(jié)律。地球表層系統(tǒng)中的生物圈、水圈及大氣圈均受地球軌道旋回的影響。它不僅自身表現(xiàn)著節(jié)律性,而且通過反饋體系強烈影響著沉積作用。白堊紀(jì)是地質(zhì)歷史階段中一個典型的極端溫室氣候時期,尤其在晚白堊時期爆發(fā)了大量地質(zhì)事件。但是人們對白堊紀(jì)時期的研究主要集中于海相地層,為了更完善地了解白堊紀(jì)時期的地質(zhì)歷3史,松科二井(SK-II)在中國東北部開鉆。此次研究的主要目的是探究松遼盆地嫩江組中水成元素的米蘭科維奇旋回,并且揭示水成元素對其的響應(yīng)機制,包括湖水內(nèi)部水成元素的循環(huán)以及季風(fēng)對湖泊環(huán)境的影響,由此推斷白堊紀(jì)時期松遼盆地嫩江組期間的氣候的旋回變化。在此主要討論三類:(1)氧化還原敏感元素:Fe/Ti、S;(2)TOC的埋藏;(3)鹽度敏感元素:Sr/Ba。此次研究采用的巖芯來自松科二井嫩一、二段,總長163m(1086m-1249m)。巖芯保存較為連續(xù),并且分別在Fe/Ti、S、TOC、Sr/Ba中識別出良好的米蘭科維奇旋回記錄,雖然有些元素的信號不連續(xù)或不明顯,但不影響整體的記錄特征。作為良好的氧化劑和還原劑,Fe,S和TOC之間也存在相互影響。通過對比元素計數(shù)率與所濾波的波峰波谷間對應(yīng)關(guān)系,我們發(fā)現(xiàn)控制松遼盆地湖泊環(huán)境的因素主要為歲差,歲差也受偏心率的調(diào)制作用。由于米蘭科維奇旋回對地球輻射量接收有重要影響,歲差的變化能夠控制地球位于近、遠(yuǎn)日點的位置,因此古湖泊環(huán)境及古氣候會出現(xiàn)相應(yīng)的干濕旋回變化。
[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.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P534.53;P532
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本文編號：1472962