松遼盆地白堊系營城組—嫩江組離子探針鋯石U-Pb定年
發(fā)布時間：2018-12-21 19:33
【摘要】：松遼盆地作為我國最大陸相盆地,具有完整的白堊紀(jì)陸相地層序列。松遼盆地嫩江組以其發(fā)育巨厚的烴源巖及具有最大湖侵事件、CNS的結(jié)束等記錄而受到廣泛關(guān)注,前人僅在嫩二段底部獲得一個同位素年齡值,嫩江組/姚家組界線是盆地最大湖侵及海侵事件的開始時間,由于缺乏精確的同位素年齡值,該年齡還處于爭論之中;營城組發(fā)生了兩次較大的火山運(yùn)動事件,是東北亞地區(qū)晚中生代巖漿作用的重要組成部分,厘定營城組的火山運(yùn)動事件的活動時限對正確認(rèn)識區(qū)域構(gòu)造-巖漿事件的變化規(guī)律,以及進(jìn)一步的探討區(qū)域地球動力學(xué)過程具有十分重要的意義。隨著松科1井綜合地層學(xué)的開展,松遼盆地晚白堊世年代地層學(xué)工作已經(jīng)完成,而松遼盆地早白堊世的年代地層學(xué)工作有待于松科2井的進(jìn)行而開展,完善松遼盆地白堊紀(jì)地層的年代學(xué)工作,為盆地其他地層工作提供基礎(chǔ)年代學(xué)數(shù)據(jù),并有助于將白堊紀(jì)陸相地層與海相地層進(jìn)行對比。實施松科2井鉆探的主要目的是揭露松遼盆地下白堊統(tǒng)至基底地層�！八煽�2井東孔”以松遼盆地早白堊世地層為取心目的層,目前已獲得嫩江組一段、二段、登婁庫組下部、營城組三四段以及沙河子組的部分巖心,為本文提供了絕佳的研究材料。本文以松遼盆地內(nèi)松科2井和X1-4井以及岳王城剖面和姚家車站剖面為研究對象,在嫩江組和營城組采取了6個火山巖樣品進(jìn)行SIMS鋯石U-Pb定年,獲得了部分重要地層單位的界線年齡,結(jié)果顯示:(1)嫩江組一段和嫩江組二段界線年齡為83.1Ma-83.5 Ma;姚家組二、三段和嫩江組一段的界線年齡為85.1 Ma-85.5 Ma之間;(2)營城組三段最下部的火山巖年齡為111.7 Ma。這些年齡為松遼盆地嫩江組下部提供了準(zhǔn)確的年代學(xué)制約,為嫩江組下部構(gòu)造運(yùn)動時間、CNS的結(jié)束、最大湖侵事件提供了重要的年代學(xué)制約;為營城組年代學(xué)工作和對比標(biāo)準(zhǔn)提供基礎(chǔ)數(shù)據(jù),為中國陸相白堊紀(jì)地層重大地質(zhì)事件的研究以及與全球白堊紀(jì)事件之間對比提供了精確地年齡依據(jù)。
[Abstract]:As the largest continental basin in China, Songliao Basin has a complete sequence of Cretaceous continental strata. The Nenjiang formation in Songliao Basin has received extensive attention due to its extremely thick source rocks and records of the largest lacustrine transgression events, the end of CNS, etc. Only one isotopic age value was obtained at the bottom of the second member of the Nenjiang formation in Songliao Basin. The boundary between Nenjiang formation and Yaojia formation is the beginning time of the largest lake transgression and transgression in the basin. Due to the lack of accurate isotopic age, the age is still in dispute. Two large volcanic events occurred in Yingcheng formation, which are an important part of late Mesozoic magmatism in Northeast Asia. Determining the time limit of volcanic movement events in Yingcheng formation can correctly understand the variation law of regional tectonic-magmatic events. And further study of regional geodynamic processes is of great significance. With the development of Synthetical stratigraphy in well Songke 1, the late Cretaceous chronostratigraphy in Songliao Basin has been completed, while the chronostratigraphy of early Cretaceous in Songliao Basin needs to be carried out in Songke2 well. To improve the chronology of Cretaceous strata in Songliao Basin, to provide basic chronological data for other stratigraphic work in the basin, and to help the Cretaceous continental strata and marine strata to be correlated. The main purpose of drilling well Songke 2 is to expose the Lower Cretaceous to basement strata in Songliao Basin. Taking the early Cretaceous strata of Songliao Basin as the formation of the east hole of Songke 2 well, the first and second member of Nenjiang formation, the lower part of Denglouku formation, the third and fourth member of Yingcheng formation and part of the core of Shahezi formation have been obtained. It provides excellent research materials for this paper. In this paper, taking Songke 2 well and X1-4 well in Songliao Basin as research objects, six volcanic rock samples were taken from Nenjiang formation and Yingcheng formation for SIMS zircon U-Pb dating. The boundary ages of some important stratigraphic units have been obtained. The results show that: (1) the boundary ages of the first and second sections of the Nenjiang formation and Nenjiang formation are 83.1Ma-83.5 Ma;. The boundary ages of the second, third and the first member of the Yaojia formation and the Nenjiang formation are between 85.1 Ma-85.5 Ma and (2) the lowest volcanic age of the third member of the Yingcheng formation is 111.7 Ma.. These ages provide accurate geochronological constraints for the lower part of the Nenjiang formation in Songliao Basin, and provide important geochronological constraints for the tectonic movement time of the lower part of the Nenjiang formation, the end of CNS, and the maximum lacustrine transgression event. It provides basic data for geochronological work and correlation standard of Yingcheng formation, and provides an accurate age basis for the study of major geological events in the continental Cretaceous strata in China and the correlation between them and the global Cretaceous events.
【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】：P597.3;P534.53
，
本文編號：2389360
[Abstract]:As the largest continental basin in China, Songliao Basin has a complete sequence of Cretaceous continental strata. The Nenjiang formation in Songliao Basin has received extensive attention due to its extremely thick source rocks and records of the largest lacustrine transgression events, the end of CNS, etc. Only one isotopic age value was obtained at the bottom of the second member of the Nenjiang formation in Songliao Basin. The boundary between Nenjiang formation and Yaojia formation is the beginning time of the largest lake transgression and transgression in the basin. Due to the lack of accurate isotopic age, the age is still in dispute. Two large volcanic events occurred in Yingcheng formation, which are an important part of late Mesozoic magmatism in Northeast Asia. Determining the time limit of volcanic movement events in Yingcheng formation can correctly understand the variation law of regional tectonic-magmatic events. And further study of regional geodynamic processes is of great significance. With the development of Synthetical stratigraphy in well Songke 1, the late Cretaceous chronostratigraphy in Songliao Basin has been completed, while the chronostratigraphy of early Cretaceous in Songliao Basin needs to be carried out in Songke2 well. To improve the chronology of Cretaceous strata in Songliao Basin, to provide basic chronological data for other stratigraphic work in the basin, and to help the Cretaceous continental strata and marine strata to be correlated. The main purpose of drilling well Songke 2 is to expose the Lower Cretaceous to basement strata in Songliao Basin. Taking the early Cretaceous strata of Songliao Basin as the formation of the east hole of Songke 2 well, the first and second member of Nenjiang formation, the lower part of Denglouku formation, the third and fourth member of Yingcheng formation and part of the core of Shahezi formation have been obtained. It provides excellent research materials for this paper. In this paper, taking Songke 2 well and X1-4 well in Songliao Basin as research objects, six volcanic rock samples were taken from Nenjiang formation and Yingcheng formation for SIMS zircon U-Pb dating. The boundary ages of some important stratigraphic units have been obtained. The results show that: (1) the boundary ages of the first and second sections of the Nenjiang formation and Nenjiang formation are 83.1Ma-83.5 Ma;. The boundary ages of the second, third and the first member of the Yaojia formation and the Nenjiang formation are between 85.1 Ma-85.5 Ma and (2) the lowest volcanic age of the third member of the Yingcheng formation is 111.7 Ma.. These ages provide accurate geochronological constraints for the lower part of the Nenjiang formation in Songliao Basin, and provide important geochronological constraints for the tectonic movement time of the lower part of the Nenjiang formation, the end of CNS, and the maximum lacustrine transgression event. It provides basic data for geochronological work and correlation standard of Yingcheng formation, and provides an accurate age basis for the study of major geological events in the continental Cretaceous strata in China and the correlation between them and the global Cretaceous events.
【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】：P597.3;P534.53
，
本文編號：2389360
本文鏈接：http://sikaile.net/kejilunwen/diqiudizhi/2389360.html
最近更新
教材專著
