【摘要】：本研究以位于渤海灣西岸北部的QG01鉆孔(地理坐標:E117°43′38″,N39°16′30″)沉積物為基本研究材料,總結(jié)了沉積物粒度特征、粘土礦物分布和含量變化,并結(jié)合光釋光年代學和前人的研究成果,探討了渤海灣西部晚更新世自全新世中期的氣候環(huán)境變化特征和過程,得出結(jié)論如下:1.QG01孔全新世以來受河流供給以及海平面的變化的影響沉積速率呈現(xiàn)三個階段變化,分別是:18-8.5ka陸上河流控制的低速率沉積;8.5-5.4ka海平面上升和河流進積共同作用的中等速率沉積,5.4ka至今河流供給加強的高速率沉積。2.研究區(qū)在全新世經(jīng)歷了一次明顯的海陸更替過程,由洪泛平原相、潮灘相過渡到三角洲相,其沉積環(huán)境的演化是海平面變化和河流進積綜合作用的結(jié)果。早期主要受海平面控制,中晚期主要受河流進積作用控制,特別是黃河三角洲對海岸變遷的控制。3.本區(qū)粘土礦物組合形式為伊利石—綠泥石—高嶺石—蒙脫石。四種粘土礦物的含量以及伊利石KI指數(shù)在垂向上的變化特點顯示7.2-5.6ka間研究區(qū)可能有來自黃河的物質(zhì)混入。4.(伊利石+綠泥石)/(蒙脫石+高嶺石)的比值可以作為古氣候演化的替代指標,結(jié)合伊利石KI指數(shù)能夠反映出古氣候演化的冷暖周期。古氣候演化替代指標的M-K檢驗結(jié)果顯示:末次盛冰期結(jié)束后至早全新世,研究區(qū)經(jīng)歷了一個逐漸的升溫過程,其中14-8.5ka BP升溫最為顯著。進入全新世早中期升溫趨緩,期間(8.3-7.9ka BP)有一次不太顯著的降溫事件,但是沒有改變升溫的總趨勢。
[Abstract]:In this study, the sediment from the QG01 borehole located in the northern part of the west coast of Bohai Bay (geographic coordinates: E117 擄43N38 "N39 擄1630") was used as the basic research material, and the grain size characteristics, clay mineral distribution and content changes of the sediments were summarized. Combined with photoluminescence chronology and previous research results, the characteristics and processes of climate and environment changes in the western Bohai Bay since the middle Holocene were discussed. The conclusions are as follows: 1. The sedimentation rate of QG01 hole has changed in three stages since the Holocene due to river supply and sea level change. They are the medium rate deposits controlled by low rate sediments controlled by the overland rivers of: 18-8.5ka 8.5-5.4ka and fluvial progradation, respectively. The medium rate deposits have been increased by 5.4ka and the high rate deposits have been enhanced by the river supply up to now. During the Holocene, the study area experienced an obvious process of sea and land turnover, from flood plain facies, tidal flat facies to delta facies. The evolution of sedimentary environment was the result of the integrated action of sea level change and river progradation. In the early stage, the sea level was the main control, and the middle and late stages were mainly controlled by river progradation, especially by the Yellow River Delta, which controlled the coastal vicissitude. The clay mineral assemblage form is Illite-chlorite-kaolinite-montmorillonite. The contents of four kinds of clay minerals and the vertical variation of Illite Ki index indicate that there may be material mixed with the Yellow River in the study area of 7.2-5.6ka. The ratio of (Illite chlorite) to (montmorillonite kaolinite) can be used as an alternative index of paleoclimate evolution and the Illite KI index can reflect the cold and warm periods of paleoclimate evolution. The M-K test of paleoclimate evolution substitution index shows that from the end of the last glacial peak to the early Holocene, the study area experienced a gradual warming process, in which 14-8.5ka BP temperature rise was the most significant. In the early and middle Holocene, there was a less-obvious cooling event in the period (8.3-7.9ka BP), but it did not change the general trend of temperature rise.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P532

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