發(fā)布時(shí)間：2018-07-09 19:24

  本文選題：乳山盆地 + 下白堊統(tǒng)��； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：山東乳山盆地位于渤海灣盆地南部,受郯-廬斷裂帶活動的影響,盆地地震活動強(qiáng)烈,發(fā)育一系列與地震活動相關(guān)的地震事件沉積構(gòu)造,成為研究震積巖較為理想的天然實(shí)驗(yàn)室。本論文依托山東乳山盆地下白堊統(tǒng)止鳳莊組露頭、剖面,以沉積地質(zhì)學(xué)、礦物學(xué)-巖石學(xué)、沉積地球化學(xué)、構(gòu)造地質(zhì)學(xué)等理論為指導(dǎo),詳細(xì)研究了止鳳莊組地層發(fā)育特征、震積巖類型及其幾何學(xué)、運(yùn)動學(xué)特征。并通過碎屑鋯石年代學(xué)手段,約束震積巖形成的時(shí)間,揭示了晚侏羅世-早白堊世郯廬斷裂活動的性質(zhì)及其地質(zhì)記錄。山東乳山盆地下白堊統(tǒng)止鳳莊組屬萊陽群底部,為萊陽群五個(gè)組級(由下至上分別為林寺山組、止鳳莊組、水南組、龍旺狀組、曲格莊組)單元之一,與上覆水南組、下伏林寺山組皆呈整合接觸。主要由沖積扇、河流相的礫巖、含礫砂巖、粉砂巖構(gòu)成。礫石礫徑大小不一,礫巖的單層厚度在2-4m左右,礫石大小多數(shù)在5-20cm之間,有的可達(dá)50cm,分選較差,磨圓中等;含礫砂巖單層厚度在5-10m,分選磨圓由較差-較好不等。填隙物中雜基含量在0-10%之間,膠結(jié)物主要為硅質(zhì)膠結(jié),其次為鐵質(zhì)膠結(jié)。同時(shí)發(fā)育平行層理、板狀層理、沖刷-充填構(gòu)造、波狀層理等一系列沉積構(gòu)造;在這套地層中發(fā)育液化砂泥巖脈、液化卷曲變形構(gòu)造、球枕狀-砂枕狀構(gòu)造、泄水構(gòu)造(火焰狀構(gòu)造)、階梯狀微斷層等5種地震沉積構(gòu)造,并根據(jù)其成因動力學(xué),結(jié)合前人研究成果將山東乳山盆地震積巖分為2大類(軟沉積物變形構(gòu)造和硬巖層脆性變形構(gòu)造)、3小類(液化變形構(gòu)造、擠壓變形構(gòu)造、脆性變形構(gòu)造),其中液化變形構(gòu)造又可分為泄水構(gòu)造(火焰狀構(gòu)造)、砂枕-球枕狀構(gòu)造、液化砂泥巖脈、液化卷曲變形構(gòu)造等4種類型;同時(shí)通過對ZFZ-2樣品碎屑鋯石U-Pb測年分析,其年齡范圍107-123Ma,得出其206Pb/238U表面年齡加權(quán)平均值為114.5Ma,這與前人研究測試數(shù)據(jù)一致,即認(rèn)為軟沉積變形事件發(fā)生于114.5Ma之后。通過對研究區(qū)目標(biāo)層位震積巖當(dāng)中廣泛發(fā)育波浪狀背斜構(gòu)造,其中軸線角度從65度變?yōu)?0度,以及液化砂泥巖脈脈體方向的轉(zhuǎn)變的研究,揭示了其形成機(jī)制可能與在晚侏羅-早白堊世時(shí)期(145.5~99.6Ma),郯-廬斷裂帶發(fā)生左旋走滑產(chǎn)生的左旋剪切作用力有關(guān)。
[Abstract]:The Shandong Rushan basin is located in the south of Bohai Bay basin. Influenced by the activity of the Tan-Lu fault zone, the basin has strong seismic activity and develops a series of sedimentary structures related to seismic events. It is an ideal natural laboratory for studying seismite. Based on the outcrop and profile of the Lower Cretaceous Zhifengzhuang formation in the Rushan Basin, Shandong Province, and guided by the theories of sedimentary geology, mineralogy-petrology, sedimentary geochemistry and tectonic geology, the stratigraphic development characteristics of the Zhifengzhuang formation are studied in detail in this paper. Types of seismogenic rocks and their geometries and kinematic characteristics. By means of clastic zircon chronology, the formation time of seismite is restricted, and the characteristics and geological records of Tanlu fault activity in late Jurassic-early Cretaceous are revealed. The Lower Cretaceous Zhifengzhuang formation belongs to the bottom of the Laiyang Group in the Rushan Basin, Shandong Province. It is one of the five units of the Laiyang Group (Linshishan formation, Zhifeng Zhuang formation, Shuinan formation, Longwang formation, Qugezhuang formation) from the bottom of the lower Cretaceous. All of the lower Fulinsi formation were integrated contact. Mainly by alluvial fan, fluvial facies conglomerate, gravel sandstone, siltstone composition. The gravel diameter is different, the single layer thickness of gravel is about 2-4m, the gravel size is mostly between 5-20cm, some can reach 50 cm, the separation is poor, the grinding circle is medium, and the single layer thickness of gravel sandstone is 5-10 m, the separation and grinding circle varies from poor to better. The content of hetero group in the interstitial material is between 0 and 10%, and the cement is mainly siliceous cemented, followed by iron cementation. A series of sedimentary structures, such as parallel bedding, plate bedding, scour filling structure, wave bedding and so on, have been developed in this set of strata, such as liquefaction sand and mudstone vein, liquefaction crimp deformation structure, ball pillow and sand pillow structure, Five kinds of seismic sedimentary structures, such as discharge structure (flame structure), step microfault, etc., and according to their genetic dynamics, Based on the previous research results, the seismogenic rocks of Shandong Rushan basin are divided into two types (soft sediment deformation structure and hard rock brittle deformation structure) and three sub-types (liquefaction deformation structure, compressional deformation structure, compression deformation structure). Among them, the liquefaction deformation structure can be divided into four types: discharge structure (flame structure), sand pillow-ball pillow structure, liquefaction sand and mudstone vein, and liquefaction convoluted deformation structure. At the same time, the zircon U-Pb dating of ZFZ-2 sample shows that its age range is 107-123 Ma, and the weighted average surface age of 206Pb / 238U is 114.5 Ma, which is consistent with the previous data, that is, the deformation event of soft deposition occurred after 114.5 Ma. Through the study of the development of wavy anticline structures in the seismogenic rocks of the target horizon in the study area, the central axis angle has changed from 65 degrees to 80 degrees, and the direction of the veins of the liquefied sand and mudstone has been changed. It is suggested that the formation mechanism of Tan-Lu fault zone may be related to the left-lateral shear force produced by left-lateral strike-slip during the late Jurassic-early Cretaceous period (145.5 ~ 99.6 Ma).
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P315.2;P588.2

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