本文選題：地層對(duì)比　切入點(diǎn)：古地理　出處：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：蘇州地區(qū)地處蘇南-滬西的中心地帶,位于太湖和長江三角洲南翼后緣之間,占據(jù)有重要的地理位置;在地質(zhì)構(gòu)造方面,本區(qū)位于我國東部大構(gòu)造單元—下?lián)P子準(zhǔn)地臺(tái)區(qū)下?lián)P子斷塊內(nèi),南與浙西地塊相接,蘇州地區(qū)第四系埋深大致為150m-200m。通過前人的研究大致了解到整個(gè)長江三角洲地區(qū)的地層格架的特點(diǎn),蘇州地區(qū)從屬于長江三角洲的地層格架,因此本區(qū)地層厚度分布特點(diǎn)是:全新統(tǒng)到更新統(tǒng)上部整個(gè)地區(qū)地層厚度無明顯變化,更新統(tǒng)中部到更新統(tǒng)下部底界地層?xùn)|厚西薄。除此之外,在蘇州地區(qū)發(fā)現(xiàn)70%的鉆孔分布有埋藏在不同深度的硬質(zhì)粘土,前人已驗(yàn)證淺層硬粘土可作為劃分全新統(tǒng)與更新統(tǒng)上部的分界線,對(duì)于深層硬粘土是否可作為地層劃分的標(biāo)志尚未見報(bào)道,是本文討論的問題之一。本論文主要參考蘇州地區(qū)23個(gè)鉆孔及標(biāo)準(zhǔn)孔的代表性年代地層數(shù)據(jù),借助控制性鉆孔BK1、BK2孢粉圖譜推測(cè)某一深度范圍內(nèi)孢粉曲線預(yù)測(cè)的古氣候,結(jié)合蘇州地區(qū)巖性地層劃分方案,收集了包括常州、上海在內(nèi)的10個(gè)代表性鉆孔對(duì)蘇南——滬西地區(qū)的第四紀(jì)地層格架進(jìn)行劃分,得出跨區(qū)地層格架東厚西薄的特點(diǎn),修改并驗(yàn)證了前人的部分地層劃分結(jié)構(gòu):參考蘇州聯(lián)合鉆孔、SK03孔及長三角整體地層劃分對(duì)比圖將西部鉆孔BK2、東部鉆孔BK1的更新統(tǒng)上、中、部的界線統(tǒng)一下移3-8m,底界與前人劃定方法一致,同時(shí)也證明了蘇州地區(qū)的過渡性特點(diǎn)及地層格架劃分的合理性。此外,根據(jù)淺層硬質(zhì)粘土的研究方法參考控制性鉆孔測(cè)年數(shù)據(jù)借助孢粉曲線探討深層硬質(zhì)粘土作為更新世上部與中部、中部與下部標(biāo)志層的可能性與可靠性,通過研究發(fā)現(xiàn),分布在3m左右的黃褐色硬質(zhì)粘土、90m左右的藍(lán)灰色硬質(zhì)粘土及120m左右的灰綠色硬質(zhì)粘土可以作為全新世與更新世,更新世上部與中部及中部與下部的分界線。劃分本區(qū)地層可適當(dāng)?shù)膮⒖加操|(zhì)粘土的埋藏位置。最終通過硬質(zhì)粘土的研究論證本區(qū)地層格架劃分的合理性。
[Abstract]:Suzhou is located in the center of Sunan-West Shanghai, between Taihu Lake and the rear edge of the southern wing of the Yangtze River Delta, occupying an important geographical position. This area is located in the lower Yangtze fault block of the lower Yangtze quasi platform area, which is a large tectonic unit in the east of China, and is connected with the western Zhejiang block in the south. The burial depth of Quaternary system in Suzhou area is approximately 150m-200m.The characteristics of stratigraphic framework in the whole Yangtze River Delta region are roughly understood by previous studies, and the Suzhou area is subordinate to the stratigraphic framework of the Yangtze River Delta region. Therefore, the characteristics of stratigraphic thickness distribution in this area are as follows: there is no obvious change in the stratigraphic thickness of the whole area from the Holocene to the upper part of the Pleistocene, and the strata from the central part of the Pleistocene to the lower bottom of the Pleistocene are. In Suzhou, 70% of the boreholes were found to have hard clay buried at different depths. It has been proved that the shallow hard clay can be used as the dividing line between the upper part of the Holocene and the Pleistocene. Whether deep hard clay can be used as a sign of stratigraphic division is one of the problems discussed in this paper. This paper mainly refers to the representative chronostratigraphic data of 23 boreholes and standard holes in Suzhou area. The paleoclimate predicted by the sporopollen curve in a certain depth range was estimated by the sporopollen map of BK1 and BK2, and the paleoclimate, including Changzhou, was collected in combination with the lithostratigraphic classification scheme in Suzhou area. Ten representative boreholes in Shanghai have divided the Quaternary stratigraphic framework from southern Jiangsu to western Shanghai, and obtained the characteristics of the cross-area stratigraphic framework, which is thick, thick and thin in the east and west. Modification and verification of some stratigraphic division structure of predecessors: referring to Suzhou combined drilling hole SK03 hole and the whole stratigraphic division and correlation map of Yangtze River Delta, the upper and middle Pleistocene series of BK1 in the western borehole BK2 and the eastern borehole, The boundary line of the part is uniformly shifted from 3 to 8 m, and the bottom boundary is consistent with the previous methods. It also proves the transitional characteristics of Suzhou area and the rationality of stratigraphic framework division. According to the research method of shallow hard clay, the possibility and reliability of deep hard clay as the renewal of the world part and the middle part and the middle part and the lower part of the earth are discussed with the aid of sporopollen curve according to the controlled borehole dating data. The yellow-brown hard clay about 90m and the gray-green hard clay about 120m can be used as Holocene and Pleistocene. The dividing line between the middle part of the world and the middle part and the middle part and the lower part is renewed. The stratigraphic division of this area can refer to the buried location of hard clay appropriately. Finally, the rationality of stratigraphic framework division in this area is proved through the study of hard clay.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P534.631

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本文編號(hào)：1570155