本文選題：黃土巖芯　切入點：光釋光年代學(xué)　出處：《山東師范大學(xué)》2017年碩士論文

【摘要】：由于全球變化對人類和社會的影響愈來愈大,使得人們對全球變化的研究也越來越迫切,對過去氣候和環(huán)境演變的研究是全球變化研究的一項核心內(nèi)容。第四紀是距離人類最近的地質(zhì)歷史時期,通過研究第四紀古氣候環(huán)境的變化,可以很好的為預(yù)測未來氣候環(huán)境演變方向提供可靠依據(jù)。中國黃土-古土壤記錄了晚新生代以來東亞地區(qū)古氣候和古環(huán)境演變的歷史信息,位于中國東部的山東濱海島嶼黃土與黃土高原黃土相比,由于其特殊的地理位置,記錄了沿海地區(qū)軌道尺度上的氣候環(huán)境變化和海平面變化。因此,研究該區(qū)黃土對揭示中國東部沿海地區(qū)古氣候和古環(huán)境的演化具有特殊意義。本文選擇位于山東廟島群島最西端大黑山島上的北莊村南側(cè)BZ孔黃土剖面為研究對象,結(jié)合沉積學(xué)和粘土礦物學(xué)特征分析以及光釋光年代學(xué)來探討該區(qū)環(huán)境演化的歷史進程。通過本次研究,我們獲得了以下結(jié)論:(1)我們在大黑山島BZ孔黃土剖面的50cm、100cm、150cm和200cm處采集了4個光釋光樣品,測年結(jié)果表明,大黑山島BZ孔黃土剖面50cm處OSL年齡為26.23±4.92ka,該時間段處于晚更新世末期,由此推斷BZ孔黃土剖面頂端全新世和MIS 2階段黃土缺失,這可能由于沉積后被侵蝕掉或者沒有沉積。將大黑山島BZ孔黃土剖面與同位于廟島群島區(qū)域內(nèi)的仙境源剖面和MDS剖面進行地層年齡的對比,推斷大黑山島BZ孔黃土主要為末次間冰期以來堆積的黃土。通過OSL年齡的對比及對剖面沉積時期的推斷,進而將大黑山島BZ孔黃土剖面地層進行劃分可確定,剖面0-50 cm為現(xiàn)代耕作層,50-380 cm古土壤層應(yīng)為L1S1,380-1220 cm黃土層為L1L2,1220-1610 cm古土壤層為S1。(2)通過粒度頻率曲線、概率累積曲線、粒度組成等粒度特征分析得出,大黑山島BZ孔黃土為典型風(fēng)成沉積物。大黑山島BZ孔黃土剖面粒度頻率曲線呈三峰分布,與洛川黃土相比,剖面粒度頻率分布曲線的最低峰與洛川黃土次峰相重合,但該區(qū)黃土比洛川黃土在粉砂區(qū)多一個次峰,而最高峰比洛川黃土右移,說明大黑山島BZ孔黃土顆粒較洛川黃土粗,同時表明兩個地區(qū)黃土在物質(zhì)來源和形成環(huán)境方面還存在著明顯差異。大黑山島BZ孔黃土粒度組成以粉砂(5~63μm)為主,含量平均值為60.1%,其次是砂粒(63μm),含量平均值為21.4%。與洛川及山東內(nèi)陸黃土相比,平均粒徑要粗,與同區(qū)域的南長山島黃土、砣磯島黃土和北隍城島黃土相比,粒度組成中的砂粒含量由南向北逐漸增多,這說明該地區(qū)黃土可能存在著從北方向過來的近源物質(zhì)。(3)對大黑山島BZ孔黃土粒度特征、磁化率特征、色度特征以及粘土礦物組合特征進行綜合分析,并與黃土高原黃土相對比得出,該區(qū)黃土磁化率值比黃土高原黃土值要低,粘土礦物組合特征與黃土高原不同,說明該區(qū)黃土與黃土高原黃土物源和沉積環(huán)境不同。結(jié)合各氣候指標(biāo)特征分析大黑山島BZ孔黃土剖面在堆積過程經(jīng)歷溫濕到干冷再到冷濕的環(huán)境演變歷程。1610~1220 cm為S1古土壤層,對應(yīng)著MIS5階段,氣候較溫濕。1220~380 cm為L1L2黃土層,對應(yīng)著MIS4階段,氣候相對比較干冷。380~0cm為L1S1古土壤層,對應(yīng)著MIS3階段,氣候較冷濕。剖面堆積過程中伴隨著海升與海降,剖面所指示氣候環(huán)境變化與全球氣候波動具有較好的一致性,但剖面沉積特征和物源的不同說明,在大的氣候環(huán)境背景基本一致的情況下還存在區(qū)域性環(huán)境的差異。
[Abstract]:The impact of global change on human and society more and more people, makes the study of global change is more and more urgent, the past study on climatic and environmental changes is one of the core contents of global change research. The Quaternary geological history from human recently, through the change of Quaternary climate and environment, can be good for the future direction of the evolution of climatic environment and provide a reliable basis. Chinese loess paleosol records the history information of the ancient climate in East Asia and the ancient environmental evolution since the late Cenozoic, compared to Shandong Binhai island of loess and loess of the Loess Plateau is located in the eastern part of the China, due to its special geographical location, the coastal area scale track record climate change and sea level changes. Therefore, the research has revealed the evolution of Loess China paleoclimate and Paleoenvironment in eastern coastal areas Special significance. This paper chooses Shandong is located in the temple islands west of Daheishan island on the North Village on the south side of the BZ hole loess section as the research object, combined with the analysis of sedimentology and clay mineralogy and OSL chronology of environmental evolution history of the area. Through this study, we obtained the following conclusions: (1) we are in the Daheishan Island hole BZ of loess profile 50cm, 100cm, 150cm and 200cm collected 4 OSL samples, dating results, Daheishan island BZ 50cm OSL hole loess section age was 26.23 + 4.92ka, the time period in the late Pleistocene period, thus BZ loess section top hole the 2 stage of the Holocene and MIS loess missing, this may be due to erosion or deposition after deposition. Compared the Daheishan Island hole BZ loess profile and located in the same temple islands region Wonderland source section and the MDS section of stratum age, To infer the Daheishan island BZ hole is mainly accumulated in Loess since the last interglacial loess. By comparing the OSL age and inference of sedimentary period, then the Daheishan island BZ hole loess stratigraphic division can be determined, 0-50 cm of the profile for the modern soil, 50-380 cm paleosol layer should be L1S1380-1220 cm loess the cm layer is L1L21220-1610 paleosol layer is S1. (2) by size frequency curve, probability cumulative curve, analysis of the characteristics of the composition of the size that the Daheishan island is a typical loess BZ hole aeolian sediments. Daheishan Island hole BZ loess section size frequency curve of three peak distribution, compared with Luochuan loess, frequency distribution the size of the minimum peak curve section and Luochuan loess peak coincide, but the Luochuan loess area of the loess plateau than in silty sand area more than a second peak, and the peak ratio of Luochuan loess is right, that Daheishan island BZ loess particles is Luo hole At the same time that thick loess, loess area in two and the formation of material source environment there are still significant differences. The composition of Daheishan Island hole BZ loess grain size with silt (5~63 m), the average content of 60.1%, followed by sand (63 m), the average content is 21.4%. compared with Luochuan Shandong and the inland loess, the average particle size to rough, with the same area of the South Changshan island of loess, loess and mound compared Isojima beihuangcheng Island loess, sand content gradually increased in size from south to north, which indicates that the Loess may exist near the source material from the north to the (3) to come. The grain size characteristics of Daheishan island BZ hole loess, magnetic susceptibility characteristics, color characteristics and the characteristics of clay minerals were analyzed, and the relative ratio of loess in loess plateau that the Loess magnetic susceptibility value is lower than the value of the Loess Plateau, the characteristics of clay minerals and the Loess Plateau Different, indicating that the area of the Loess Plateau and the loess plateau loess source and different sedimentary environments. Combined with the characteristics of each climate index analysis of Daheishan Island hole BZ loess section in the accumulation process through temperature and humidity to dry to cold wet environment evolution.1610~1220 cm S1 paleosol layer, corresponding to the MIS5 stage, the climate was warm and wet.1220~380 cm L1L2 for the loess layer, corresponding to the MIS4 stage, the climate is relatively dry and cold.380~0cm L1S1 paleosol layer, corresponding to the MIS3 stage, the climate was cold and wet. The profile accumulation process was accompanied by reduced section and the sea sea, indicating climate change and global climate fluctuations have good consistency, but that different sedimentary the characteristics and provenance, climate in the background under the condition of the same there are regional differences in the environment.

【學(xué)位授予單位】：山東師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P532;P512.2

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