新鄉(xiāng)市第四紀(jì)地層劃分與沉積環(huán)境研究
發(fā)布時間：2018-08-28 11:07
【摘要】：研究區(qū)新鄉(xiāng)市地處中原腹地、黃河中下游北側(cè),西鄰太行山山前斷裂帶,東接中國東部平原地區(qū),整體位于湯陰地塹西南端。地貌上位于我國地勢第二、三階梯的過渡位置,即西部山地與東部平原之間的過渡帶。特殊的地理位置決定了其地質(zhì)環(huán)境的特殊性,新鄉(xiāng)地區(qū)第四紀(jì)沉沉積地貌同時受到新構(gòu)造活動與黃河發(fā)展的影響。因此,合理劃分其地層單元,恢復(fù)新鄉(xiāng)地區(qū)第四紀(jì)沉積環(huán)境,正確認(rèn)識其地質(zhì)發(fā)展史對本區(qū)現(xiàn)代的城市規(guī)劃建設(shè)、防災(zāi)減災(zāi)以及相關(guān)的經(jīng)濟(jì)建設(shè)活動有重要意義。本文依托于新鄉(xiāng)市城市活動斷層探測項(xiàng)目,以沉積學(xué)、年代地層學(xué)、巖石地層學(xué)為指導(dǎo),根據(jù)野外鉆孔巖性和測年數(shù)據(jù)等資料,對新鄉(xiāng)市第四紀(jì)地層劃分進(jìn)行厘定,并進(jìn)行沉積相分析,討論影響研究區(qū)第四紀(jì)沉積過程的因素。主要得到以下結(jié)論:1、結(jié)合巖性、測年數(shù)據(jù)、孢粉組合與前人研究成果,將新鄉(xiāng)地區(qū)第四紀(jì)地層劃分為:全新統(tǒng)濮陽組(Qhp)、更新統(tǒng)上部會興鎮(zhèn)組(Qp3h)、更新統(tǒng)中部陜縣組(Qp2s)、更新統(tǒng)下部三門峽組(Qp1s)(北部地區(qū)缺失)。2、通過對代表性鉆孔的研究,結(jié)合粒度分析等,識別出新鄉(xiāng)地區(qū)更新世早期以來的地層包含沖洪積相、河流相和三角洲相,其中,河流相為本區(qū)域主要沉積相。新鄉(xiāng)市第四紀(jì)總體上位于太行山脈東南側(cè),黃河北側(cè),受其影響,沉積過程明顯由北至南,第四紀(jì)地層依次加厚,到新鄉(xiāng)市南西方向沉積物砂層明顯厚,粒度上粗,明顯屬于偏河道的沉積體系,反應(yīng)南西部沉積環(huán)境更接近黃河河道體系。3、研究區(qū)沉積古地理的演化反應(yīng)了黃河沖積扇扇體不斷向東部擴(kuò)展,以及由于地勢的變化,黃河河道由北向南的遷移情況。4、通過本區(qū)南北向聯(lián)合鉆孔的對比,發(fā)現(xiàn)第四紀(jì)晚期地層分布基本穩(wěn)定,沉積相帶對比良好;而第四紀(jì)早期的地層穩(wěn)定性較差,主要反映局部地區(qū)地層有陡變或突變特征,方向上為從南向北的東西向相帶,并且在第四紀(jì)早期的三角洲沉積與河流相沉積之間存在沉積間斷,綜合分析,這種現(xiàn)象與第四紀(jì)早期湯東斷裂的活動有關(guān)。
[Abstract]:Xinxiang City is located in the hinterland of the Central Plains, north of the middle and lower reaches of the Yellow River, near the Taihang Mountain Foreland Fault Zone in the west, and in the east of China's East Plain area, and the whole is located at the southwest end of the Tangyin graben. The geomorphology is located in the transitional position of the second and third steps of the terrain in China, that is, the transitional zone between the western mountainous area and the eastern plain. The special geographical location determines the particularity of its geological environment, and the Quaternary sedimentary landforms in Xinxiang area are simultaneously affected by neotectonic activities and the development of the Yellow River. Therefore, it is of great significance for modern urban planning and construction, disaster prevention and mitigation and related economic construction activities to reasonably divide its stratigraphic units, restore Quaternary sedimentary environment in Xinxiang area, and correctly understand its geological development history. Based on the active fault detection project of Xinxiang city and guided by sedimentology, chronostratigraphy and lithostratigraphy, the classification of Quaternary strata in Xinxiang city is determined according to the data of drilling lithology and dating data in the field. The sedimentary facies were analyzed and the factors influencing the Quaternary sedimentary process in the study area were discussed. The main conclusions are as follows: 1. Combined with lithology, dating data, sporopollen assemblage and previous research results, The Quaternary strata of Xinxiang area are divided into: (Qhp), upper Huexingzhen formation (Qp3h), central Pleistocene Shaanxi county formation (Qp2s), lower Pleistocene Sanmenxia formation (missing in northern region). The strata in Xinxiang area since the early Pleistocene contain alluvial facies fluvial facies and delta facies among which fluvial facies are the main sedimentary facies in the region. The Quaternary period of Xinxiang City is generally located in the southeast of Taihang Mountains and the north side of the Yellow River. Under its influence, the sedimentary process is obviously from north to south, the Quaternary strata are thickened in turn, and to the southwest direction of Xinxiang City, the sediment sand layer is obviously thick and the grain size is coarse. The sedimentary environment in the western part of the region is closer to that of the Yellow River channel system. The evolution of sedimentary paleogeography in the study area reflects the continuous expansion of the alluvial fan body of the Yellow River to the east, as well as the variation of the topography. The migration of the Yellow River from north to south shows that the stratigraphic distribution of the late Quaternary is basically stable, the correlation of sedimentary facies is good, and the stratigraphic stability is poor in the early Quaternary. It mainly reflects the abrupt change or abrupt change of the strata in the local area, the direction of which is the east-west facies belt from the south to the north, and there are sedimentary discontinuity between the delta and fluvial facies in the early Quaternary, which is analyzed synthetically. This phenomenon is related to the activity of Tangdong fault in the early Quaternary.
【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】：2015
【分類號】：P534.63
本文編號：2209214
[Abstract]:Xinxiang City is located in the hinterland of the Central Plains, north of the middle and lower reaches of the Yellow River, near the Taihang Mountain Foreland Fault Zone in the west, and in the east of China's East Plain area, and the whole is located at the southwest end of the Tangyin graben. The geomorphology is located in the transitional position of the second and third steps of the terrain in China, that is, the transitional zone between the western mountainous area and the eastern plain. The special geographical location determines the particularity of its geological environment, and the Quaternary sedimentary landforms in Xinxiang area are simultaneously affected by neotectonic activities and the development of the Yellow River. Therefore, it is of great significance for modern urban planning and construction, disaster prevention and mitigation and related economic construction activities to reasonably divide its stratigraphic units, restore Quaternary sedimentary environment in Xinxiang area, and correctly understand its geological development history. Based on the active fault detection project of Xinxiang city and guided by sedimentology, chronostratigraphy and lithostratigraphy, the classification of Quaternary strata in Xinxiang city is determined according to the data of drilling lithology and dating data in the field. The sedimentary facies were analyzed and the factors influencing the Quaternary sedimentary process in the study area were discussed. The main conclusions are as follows: 1. Combined with lithology, dating data, sporopollen assemblage and previous research results, The Quaternary strata of Xinxiang area are divided into: (Qhp), upper Huexingzhen formation (Qp3h), central Pleistocene Shaanxi county formation (Qp2s), lower Pleistocene Sanmenxia formation (missing in northern region). The strata in Xinxiang area since the early Pleistocene contain alluvial facies fluvial facies and delta facies among which fluvial facies are the main sedimentary facies in the region. The Quaternary period of Xinxiang City is generally located in the southeast of Taihang Mountains and the north side of the Yellow River. Under its influence, the sedimentary process is obviously from north to south, the Quaternary strata are thickened in turn, and to the southwest direction of Xinxiang City, the sediment sand layer is obviously thick and the grain size is coarse. The sedimentary environment in the western part of the region is closer to that of the Yellow River channel system. The evolution of sedimentary paleogeography in the study area reflects the continuous expansion of the alluvial fan body of the Yellow River to the east, as well as the variation of the topography. The migration of the Yellow River from north to south shows that the stratigraphic distribution of the late Quaternary is basically stable, the correlation of sedimentary facies is good, and the stratigraphic stability is poor in the early Quaternary. It mainly reflects the abrupt change or abrupt change of the strata in the local area, the direction of which is the east-west facies belt from the south to the north, and there are sedimentary discontinuity between the delta and fluvial facies in the early Quaternary, which is analyzed synthetically. This phenomenon is related to the activity of Tangdong fault in the early Quaternary.
【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】：2015
【分類號】：P534.63
【參考文獻(xiàn)】
相關(guān)期刊論文 前2條
1 任文菊,劉明清,趙麗;豫北深、淺部構(gòu)造特征與地震[J];華北地震科學(xué);2000年03期
2 王強(qiáng),劉立軍,徐海振,馬震,職太平,蘭自亭,王亞斌,劉雪松,林沛,董殿偉;華北平原第四系下限的再研究[J];地質(zhì)調(diào)查與研究;2003年01期
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