發(fā)布時(shí)間：2018-04-05 14:32

  本文選題：冰磧物　切入點(diǎn)：寒潮　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：第四紀(jì)古冰川遺跡是研究當(dāng)時(shí)氣候變動(dòng)最直觀的標(biāo)志和證據(jù),通過對(duì)古冰川遺跡分布位置、年齡和地貌特征的研究,可以反演第四紀(jì)期間的氣候環(huán)境變化,第四紀(jì)氣候環(huán)境的變化與人類的關(guān)系是密不可分的,研究第四紀(jì)冰川能夠使人類更深入地掌握世界氣候的演化史和預(yù)測(cè)未來的氣候環(huán)境變化,為人類與地球能夠建立更加和諧的依存關(guān)系做出巨大貢獻(xiàn)。本文在四子王旗大井坡地區(qū)共識(shí)別出三條冰磧壟,采用了統(tǒng)計(jì)分析冰磧物組成、光釋光(OSL)測(cè)年技術(shù)、孢粉化石統(tǒng)計(jì)分析和對(duì)各冰期進(jìn)行區(qū)域?qū)Ρ鹊妊芯渴侄�。通過學(xué)習(xí)和整理地質(zhì)前輩們的研究成果,本文深入分析四子王旗大井坡地區(qū)冰川期次和成因與氣候變化之間的關(guān)系,探討內(nèi)蒙古大井坡地區(qū)第四紀(jì)期間古冰川遺跡的分布情況和成因機(jī)制的重要影響因素,綜合以上資料論文取得如下認(rèn)識(shí):1.依據(jù)野外資料與實(shí)驗(yàn)結(jié)果可以認(rèn)別出研究區(qū)內(nèi)共三條冰磧壟,第一條冰磧壟主要由石英巖礫石組成,其年齡為292.2±16.3ka,當(dāng)時(shí)的氣候?yàn)獒樔~林-草原,氣候溫涼偏干,對(duì)應(yīng)氧同位素MIS8階段,為故鄉(xiāng)冰期第二階段(倒數(shù)第二次冰期);第二條冰磧壟主要由白云母花崗巖礫石組成,其年齡為127.3±6.2ka,當(dāng)時(shí)的氣候?yàn)獒樔~林-草原,氣候溫涼略干,對(duì)應(yīng)氧同位素MIS6階段,為故鄉(xiāng)冰期第三階段(倒數(shù)第二次冰期);第三條冰磧壟主要由灰?guī)r礫石組成,其年齡為70.4±3.7ka,當(dāng)時(shí)的氣候?yàn)椴菰?氣候溫涼略干,對(duì)應(yīng)氧同位素MIS4階段,為末次冰期。2.綜合研究大青山北坡地區(qū)的古冰川遺跡年代特征、形態(tài)特征以及分布特征,可以證明第四紀(jì)大青山北坡發(fā)生過規(guī)模較大的冰川作用,其冰川性質(zhì)可能屬于大陸型冰川,有著分布面積廣、沉積物厚度大的特點(diǎn),這對(duì)于進(jìn)一步研究第四紀(jì)期間的古氣候環(huán)境及其變化規(guī)律有著重大意義。3.論文研究認(rèn)為,影響中國(guó)東部低山丘陵區(qū)古冰川活動(dòng)范圍的最主要因素是古寒潮活動(dòng),古寒潮活動(dòng)的影響范圍,基本上就是古冰川活動(dòng)和冰緣環(huán)境的分布范圍,這可能是近年來許多研究者在我國(guó)南方能找到古冰川活動(dòng)遺跡的原因。不能用簡(jiǎn)單的雪線高度(西部冰川成因理論)來判定是否存在古冰川遺跡,頻繁的寒潮活動(dòng)使氣溫保持在有利于冰川發(fā)育的條件,是完全可能的。
[Abstract]:Quaternary ancient glacial remains are the most intuitionistic signs and evidence to study the climate change at that time. By studying the location, age and geomorphological characteristics of ancient glacier remains, the climatic and environmental changes during the Quaternary period can be inversed.The change of Quaternary climate and environment is inextricably related to human beings. The study of Quaternary glaciers can enable people to have a deeper understanding of the history of the world's climate evolution and predict future climatic and environmental changes.To make a great contribution to the establishment of a more harmonious relationship between human beings and the earth.In this paper, three moraine ridges have been identified in Dagingpo area of Siziwang Banner. Statistical analysis of moraine composition, OSL dating technique, statistical analysis of sporopollen fossils and regional comparison of various glacial ages have been used in this paper.By studying and sorting out the research achievements of the geological predecessors, this paper deeply analyzes the relationship between the glaciation and genesis and climate change in the Dagingpo area of Siziwang Banner.The distribution of ancient glacial remains during the Quaternary and the important influencing factors of the genetic mechanism in the Dagingpo area of Inner Mongolia were discussed.Based on field data and experimental results, three moraine ridges were identified in the study area. The first moraine ridge was mainly composed of quartzite gravel with an age of 292.2 鹵16.3 ka.The climate was coniferous and steppe at that time, and the climate was warm and dry.Corresponding to the oxygen isotope MIS8 stage, the second stage of the native glacial age (the penultimate ice age) and the second moraine ridge are mainly composed of Muscovite granite gravel, whose age is 127.3 鹵6.2 ka.The climate at that time was coniferous forest and grassland, and the climate was warm and cool and slightly dry.The corresponding oxygen isotope MIS6 stage is the third stage of the native glacial age (the penultimate second glacial period), the third moraine ridge is mainly composed of limestone gravel, its age is 70.4 鹵3.7ka.The climate at that time was steppe, the climate was mild and dry, corresponding to the MIS4 stage of oxygen isotope.It is the last glacial age.A comprehensive study of the age, morphology and distribution of ancient glacial remains in the northern slope of Daqingshan shows that a large scale glaciation occurred on the northern slope of Daqingshan in the Quaternary, and that the glacier may be a continental glacier.It is of great significance to further study the paleoclimate environment and its variation law during the Quaternary period.The study shows that the most important factor affecting the range of ancient glacier activity in the low hilly region of eastern China is the paleogrial wave activity, and the influence range of the paleo-cold wave activity is basically the distribution range of the paleo-glacial activity and the ice margin environment.This may be the reason why many researchers can find ancient glacier activity in southern China in recent years.The existence of ancient glacier remains can not be determined by the simple snow line height (the theory of glacier genesis in the west). It is completely possible that the temperature can be kept in favorable conditions for glacier development due to frequent cold wave activity.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P532

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