本文關(guān)鍵詞： 火山巖 地層學(xué) 同位素年代學(xué) 中生代地層 遼寧桓仁－吉林通化地區(qū)　出處：《吉林大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：作者通過(guò)兩年的野外區(qū)域地質(zhì)調(diào)查，觀察了解遼寧桓仁-吉林通化地區(qū)地層單位間的接觸關(guān)系，查明火山巖的地質(zhì)特征及時(shí)空分布并建立地層層序。通過(guò)典型剖面研究，建立區(qū)域中生代火山巖多重地層劃分與對(duì)比方案。同時(shí)，結(jié)合火山巖地球化學(xué)研究，探討其形成的動(dòng)力學(xué)背景及巖漿的源區(qū)、演化及與成礦作用的關(guān)系。野外調(diào)查采獲了豐富的巖石、化石標(biāo)本和同位素測(cè)試樣品，獲取了詳實(shí)的實(shí)物資料和數(shù)據(jù)資料。研究工作為中生代地層劃分與對(duì)比研究提供了新資料，為提高遼寧東部、吉林南部地區(qū)中生代研究水平及侏羅紀(jì)與白堊紀(jì)界限劃分提供了實(shí)際資料。 本文在廣泛收集前人資料的基礎(chǔ)上，對(duì)遼寧桓仁-吉林通化地區(qū)中生代地層中的火山巖研究現(xiàn)狀及存在的問(wèn)題進(jìn)行了歸納和總結(jié)。在野外地質(zhì)調(diào)查和綜合分析前人資料的基礎(chǔ)上，運(yùn)用地層學(xué)、巖石學(xué)、古生物學(xué)及同位素年代學(xué)等多學(xué)科相結(jié)合的研究方法，重點(diǎn)對(duì)遼寧桓仁地區(qū)、吉林通化地區(qū)的中生代盆地中火山巖發(fā)育特征、時(shí)空分布及變化規(guī)律等進(jìn)行了系統(tǒng)而深入的調(diào)查研究。在此基礎(chǔ)上，通過(guò)各典型剖面介紹，對(duì)研究區(qū)的火山巖進(jìn)行了劃分與區(qū)域?qū)Ρ妊芯�。依�?jù)地層之間的接觸關(guān)系、古生物地層，并結(jié)合同位素年代學(xué)，對(duì)研究區(qū)中生代火山巖形成時(shí)代進(jìn)行了確定。通過(guò)大量的高精度同位素測(cè)年結(jié)果可知，桓仁地區(qū)的小嶺期火山巖年齡為129-124Ma；吉林通化地區(qū)果松期火山巖年齡為130-118Ma，林子頭期火山巖年齡為129-121Ma。均形成于早白堊世，這與遼西地區(qū)的義縣組火山巖年代學(xué)基本一致。 通過(guò)對(duì)遼寧桓仁-吉林通化地區(qū)中生代地層中的火山巖研究，結(jié)合區(qū)域內(nèi)火山巖年代學(xué)特征等。研究結(jié)果認(rèn)為，依據(jù)巖石地層劃分原則，將遼寧桓仁地區(qū)的中生代火山巖劃歸為小嶺期和梨樹(shù)溝期，分別對(duì)應(yīng)小嶺組和梨樹(shù)溝組巖石地層單位，將吉林通化地區(qū)的中生代火山巖劃歸為果松期、林子頭期和三棵榆樹(shù)期，分別對(duì)應(yīng)果松組、林子頭組和三棵榆樹(shù)組巖石地層單位。對(duì)研究區(qū)中生代火山巖區(qū)域?qū)Ρ妊芯勘砻鳎煌璧鼗鹕綆r發(fā)育程度均有所差異。即便是同一盆地的不同部位，無(wú)論是火山噴發(fā)期次、噴發(fā)強(qiáng)度，還是火山噴發(fā)物質(zhì)等，均存在著不同的變化，其噴發(fā)間歇期的火山-沉積巖系的分布、化石產(chǎn)出層位等，也顯示了較大的差異性。對(duì)研究區(qū)中生代火山巖典型剖面進(jìn)行了較全面的介紹，并對(duì)主要火山巖巖石學(xué)特征進(jìn)行了簡(jiǎn)介，，為同位素年代學(xué)研究打下了較好的基礎(chǔ)。依據(jù)地層之間的接觸關(guān)系、古生物地層，并結(jié)合同位素年代學(xué)，對(duì)研究區(qū)中生代火山巖形成時(shí)代進(jìn)行了確定。通過(guò)大量的高精度同位素測(cè)年結(jié)果可知，桓仁地區(qū)的小嶺期火山巖和吉林通化地區(qū)果松期、林子頭期火山巖均形成于早白堊世，這與遼西地區(qū)的義縣組火山巖年代學(xué)基本一致。依據(jù)生物地層特征，將梨樹(shù)溝期和林子頭期火山巖對(duì)應(yīng)于義縣組上部層位。
[Abstract]:Through two years of field regional geological survey, to investigate the contact relationship of strata unit in Liaoning Huanren - Jilin Tonghua area, find out geological characteristics and spatial distribution of volcano rock and established the stratigraphic sequence. Through the study on the typical section, the establishment of a regional Mesozoic volcano rock multiple stratigraphic division and correlation scheme. At the same time, combined with the study on the geochemistry of the rocks volcano. To investigate the dynamic background and magma source region of its formation, evolution and mineralization. The field survey collected rich rocks, fossils and isotope samples, obtain detailed data and real data. The research work for the Mesozoic stratigraphic classification and correlation study provides new data, in order to improve the eastern part of Liaoning in southern Jilin, and the research level of Mesozoic Jurassic and Cretaceous boundaries provide practical information.
Based on the extensive collection of previous data, and summarizes the research status of Liaoning Huanren - Jilin Tonghua volcano rock area in Mesozoic strata and the existing problems. In the field geological survey and comprehensive analysis of previous data on the basis of the stratigraphy, rock, paleontology and isotopic geochronology research methods and other disciplines the combination, focusing on the Liaoning Huanren area, the development characteristics of volcano rock in Jilin area of Tonghua basin in Mesozoic, temporal and spatial distribution and variation of the systematic and thorough investigation and study. On this basis, through the typical section, on the volcano rock was studied. Based on the contact relationship and regional division the formation, stratigraphic and paleontological, combined with isotopic geochronology of Mesozoic volcano rocks in the study area, the formation age were determined by high precision large amount of the same. Isotopic dating results, the Huanren area small Ling period volcano rock age 129-124Ma; Jilin Tonghua pine period volcano rock ages 130-118Ma, the head of woods volcano rock age 129-121Ma. were formed in the early Cretaceous, Yixian Formation in western Liaoning Province and the volcano rock chronology is basically the same.
Through to the Liaoning Huanren - Jilin Tonghua volcano rocks of Mesozoic strata in the study area, combined with regional characteristics. The chronology of volcano rock according to the research results, on the basis of the principle of lithostratigraphic division, Liaoning Huanren area of Mesozoic volcano rock into small Ling period and Lishugou period, corresponding to small Ling group and the Lishugou formation of rock strata the Jilin Tonghua area, Mesozoic volcano rock into pine woods, head and three elms, respectively corresponding pine group, woods head group and three group of lithostratigraphic units. The Elms of Mesozoic volcano rock regional comparative study, different volcano rocks in basin are different even. Different parts of the same basin, both the volcano eruption, eruption intensity, or volcano eruptions, there were different changes, the intermittent period of eruption of volcano sedimentary rock series of the Cloth, fossil horizon, also showed great differences. The typical section of Mesozoic volcano rocks in the study area are reviewed, and the main volcano rocks are introduced, a good foundation for the study of isotope chronology. Based on the contact relationship between strata, stratigraphic and paleontological. Combined with the isotope chronology, the Mesozoic volcano rock formation in the area were determined by age. A large number of high precision isotopic dating results, pinyon small age volcano rocks in Huanren area and Jilin area of Tonghua, the head of the woods volcano rocks were formed in the early Cretaceous, the Yixian Formation in western Liaoning Province and volcano rock chronology consistent. Based on the biological characteristic of strata, the Lishugou period and the period corresponding to the volcano rock forest head Yixian Formation of upper strata.

【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P588.14

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