【摘要】：渤海灣地區(qū)晚更新世以來共經(jīng)歷了 9次海岸線變化事件,發(fā)育有三套海相地層。分別是全新世形的第Ⅰ海相地層,在晚更新世形的第Ⅱ、第Ⅲ海相地層。萊州灣作為渤海三大海灣之一,其第四紀(jì)晚期海相地層研究主要集中在黃河三角洲流域和萊州灣的東、南岸,針對(duì)萊州灣西南岸海侵的研究相比之下較少。本課題通過分析研究區(qū)介形類化石屬種特征、分布特征,對(duì)萊州灣西南岸第四紀(jì)晚期發(fā)育的海侵地層進(jìn)行識(shí)別,利用同位素測(cè)年法對(duì)海侵事件發(fā)生的時(shí)代進(jìn)行確定,并對(duì)海侵最盛時(shí)期的影響范圍進(jìn)行推斷。本次研究共采集萊州灣西南岸GK138、GK111、GK95、GK89、GK79、GK74、GK59七個(gè)鉆孔的448個(gè)樣品。采用熱酸法對(duì)樣品進(jìn)行處理,并在顯微鏡下對(duì)每個(gè)樣品進(jìn)行篩選,共發(fā)現(xiàn)含介形類化石樣品227個(gè),包含22個(gè)屬31個(gè)種,其中海相類的適宜直微花介Cathatocytheretta apta、網(wǎng)紋豆艷花介Leguminocythreis reticulata,廣鹽類的美山雙角花介Bicornucythere bisanensis、眼點(diǎn)灣貝介Loxoconcha ocellata、壓印中華美花介Sinocytyeridea impressa等在數(shù)量和分布規(guī)模上占有絕對(duì)優(yōu)勢(shì);陸相類的純凈小玻璃介Candoniella albicans、布氏土星介Ilyocypris bradyi、粗糙土星介Ilyocypris salebrosa相對(duì)較少,分布較為集中。通過研究介形蟲屬種類型以及群落的分布特征,在本研究區(qū)內(nèi)共識(shí)別出晚更新世M3海侵層、晚更新世M2海侵層和全新世M1海侵層。通過AMS14C和OSL測(cè)年法對(duì)部分樣品分析,將三套海相地層分別與全球海平面變化的MIS7階段、MIS5階段和MIS1階段對(duì)應(yīng),晚更新世的MIS7階段全球氣溫上升,冰川消融海平面最高時(shí)僅低于現(xiàn)代海平面1Om,萊州灣地區(qū)在該時(shí)期發(fā)生的海侵影響規(guī)模最小,僅抵達(dá)濰坊侯鎮(zhèn)附近;末間冰期MIS5階段,氣溫回暖,全球海平面上升至略高于現(xiàn)代海平面,此階段海侵強(qiáng)度大,沉積較厚,海侵最盛時(shí)期海水涌入萊州灣到達(dá)廣饒縣;全新世時(shí)期,末次冰期結(jié)束,氣候溫度回升,海平面上升,造就了現(xiàn)代渤海,并形成MIS1階段海相地層,此階段海侵最盛時(shí)期的海岸線到達(dá)龍池鎮(zhèn)附近并向純化方向延伸。而渤海灣其它地區(qū)發(fā)現(xiàn)的MIS3階段海侵地層在本研究區(qū)內(nèi)以過渡相沉積環(huán)境為主。
[Abstract]:Since the late Pleistocene, the Bohai Bay area has experienced 9 shoreline changes and developed three sets of marine strata. They are the first marine strata of Holocene and the second and third marine strata of late Pleistocene. Laizhou Bay is one of the three major coasts in the Bohai Sea. Its late Quaternary marine stratigraphic studies are mainly concentrated in the Yellow River Delta basin and the eastern and southern shores of the Laizhou Bay, but there are few studies on the transgression of the southwest coast of the Laizhou Bay. In this paper, the transgressive strata developed in the late Quaternary period along the southwest coast of Laizhou Bay were identified by analyzing the characteristics and distribution characteristics of the genus and species of ostracites in the study area, and the epoch of transgressive events was determined by isotopic dating. At the same time, the influence range of transgression was inferred. A total of 448 samples were collected from seven GK138,GK111,GK95,GK89,GK79,GK74,GK59 boreholes in the southwest coast of Laizhou Bay. The samples were treated by thermal acid method, and each sample was screened under microscope. A total of 227 samples containing ostracods were found, including 31 species belonging to 22 genera. Among them, marine species are suitable for direct micro-flower mesopodium Cathatocytheretta apta, mesophyllum Leguminocythreis reticulata,. The quantity and distribution of Sinocytyeridea impressa in the Loxoconcha ocellata, imprint of Bicornucythere bisanensis, in the wide salt species of Mi-shan bigophylla were superior in quantity and distribution scale, and the results showed that the number and distribution of Sinocytyeridea impressa were more and more important in the process of Loxoconcha ocellata, imprint. Candoniella albicans, 's Saturn medium Ilyocypris bradyi, rough Saturn medium Ilyocypris salebrosa is relatively few and the distribution is relatively concentrated. By studying the species types and community distribution characteristics of ostracia, the M _ 3 transgression layer, M _ 2 transgression layer and M _ 1 transgressive layer of Holocene were identified in this study area. Through the analysis of some samples by AMS14C and OSL dating, the three sets of marine strata are corresponding to the MIS7 stage, MIS5 stage and MIS1 stage of the global sea level change, respectively, and the global temperature rise in the MIS7 stage of the late Pleistocene. The maximum melting sea level is only 1Omm lower than that of modern sea level, and the scale of transgression in Laizhou Bay is the smallest, only reaching near Houzhen of Weifang. In the MIS5 stage of the late interglacial period, the temperature warmed and the global sea level rose to a little higher than the modern sea level. At this stage, the transgression intensity was large and the sediment was thicker. The sea water poured into the Laizhou Bay to reach Guangrao County at the peak of the transgression. In the Holocene, the end of the last glacial period, the rise of climate temperature and the rise of sea level formed the modern Bohai Sea and formed the marine strata in the MIS1 stage. The coastline of the transgressive peak period reached near Longchi Town and extended to the direction of purification. The transgressive strata of MIS3 stage found in other areas of Bohai Bay are mainly transitional sedimentary environment in this study area.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：Q915;P736.22

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