本文選題：沉積物粒徑　切入點(diǎn)：顏色反射率　出處：《國家海洋局第一海洋研究所》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：對泰國灣T93沉積物巖心(樣長380 cm,水深59 m)的粒度、顏色反射率、磁化率、元素(原位XRF掃描)、不飽和烯酮與GDGTs含量等多個(gè)代用指標(biāo)進(jìn)行了分析,重建了12.6 ka以來泰國灣古環(huán)境的演化歷史。研究結(jié)果表明,12.6 ka以來泰國灣沉積物組成和沉積相可劃分成4個(gè)階段:以紅黑色黏土質(zhì)粉砂為主、缺乏生物殼體的濱海相沉積(12.6-10.7ka),以黏土質(zhì)粉砂為主的濱海相(10.7-8.2 ka),以粉砂為主的陸架淺海相(8.2 ka~2.5 ka),以粘土為主、沉積環(huán)境穩(wěn)定的淺海相(2.5 ka以來)。U_(37)~k源海水表層溫度介于6.1-28.4℃,低溫出現(xiàn)在12.6-10.7 ka(可能對應(yīng)于新仙女木事件),在全新世10.6-8.2 ka期間海水表層溫度呈現(xiàn)快速升溫的趨勢,之后溫度趨于穩(wěn)定。TEX_(86)源海水溫度介于19-22.6℃,在12.6-10.7 ka時(shí)段呈現(xiàn)高值,與U_(37)~k源海水溫度呈現(xiàn)反位相的變化趨勢,這可能與TEX_(86)可能指示次表層海水溫度有關(guān)。敏感粒級組分(6.63~8.63Φ)百分含量變化指示,泰國灣所記錄的東亞冬季風(fēng)強(qiáng)度在12.6-10.7 ka顯著增加,這與石筍所記錄的東亞夏季風(fēng)減弱事件相對應(yīng);在10.6-8.2 ka,東亞冬季風(fēng)強(qiáng)度顯著減弱,并持續(xù)至2.5 ka。全新世以來,沉積記錄顯示東亞冬季風(fēng)強(qiáng)度并不穩(wěn)定。
[Abstract]:The grain size, color reflectivity, magnetic susceptibility, elements (in situ XRF scanning, unsaturated ketenone and GDGTs content) of T93 sediment cores (380 cm in length and 59 m of water depth) in the Gulf of Thailand were analyzed. The evolution history of paleoenvironment in the Gulf of Thailand since 12.6 ka has been reconstructed. The results show that the sediment composition and sedimentary facies of the Gulf of Thailand since 12.6 ka can be divided into four stages: the red and black clay silty sand is the main. Coastal marine sediments lacking biological shells (12.6-10.7 ka), coastal facies mainly silty clay (10.7-8.2 ka), shelf shallow sea facies mainly silt (8.2 ka~2.5 ka), clay dominated, shallow marine facies with stable sedimentary environment (2.5ka) have a surface water temperature of 6.1-28.4 鈩，

本文編號：1590974