本文選題：有孔蟲組合 + 穩(wěn)定同位素　； 參考：《海洋地質(zhì)與第四紀(jì)地質(zhì)》2017年02期

【摘要】：南海北部陸坡有大量高分辨率沉積記錄,對研究全球變化響應(yīng)及驅(qū)動機(jī)制有著舉足輕重的作用。本研究選取南海北部神狐海域2007年水合物鉆探區(qū)Site 6A站位柱狀沉積物,開展有孔蟲群落、穩(wěn)定同位素及AMS14 C分析研究,試圖了解該區(qū)域晚末次冰期以來古海洋和古氣候演化歷史。結(jié)果顯示,Site 6A站位柱狀沉積物中底棲有孔蟲連續(xù)分布,優(yōu)勢屬種突出,豐度、分異度波動明顯。沉積物底界為MIS3期約50kaBP,全新世沉積速率最高,為13.37cm/ka,在MIS2期可能存在由水合物分解導(dǎo)致的地層缺失。有孔蟲氧碳同位素特征恢復(fù)了冰期/間冰期氣候旋回變化及冰蓋體積變化,也指示該海域沉積環(huán)境氧化還原狀況基本不變。通過對具有特殊生態(tài)意義的底棲有孔蟲Uvigerina、Cibicidoides、Bulimina的相對豐度分析,結(jié)合似瓷質(zhì)殼體百分含量及浮游有孔蟲碳同位素,得出在末次冰期40kaBP東亞夏季風(fēng)增強(qiáng)帶來大量降雨,陸徑流量增大導(dǎo)致古生產(chǎn)力增加。12~17ka的古生產(chǎn)力高值可能與增強(qiáng)的冬季風(fēng)攜帶大量陸源碎屑沉積有關(guān),并使得北大西洋低溫、低氧、高營養(yǎng)鹽的水團(tuán)對該站位影響更大。
[Abstract]:There are a large number of high-resolution sedimentary records on the northern slope of the South China Sea, which plays an important role in the study of global change response and driving mechanism. In this study, the foraminifera community, stable isotope and AMS14 C were studied in the columnar sediments of the Site 6A station in the Shenhu area of the northern South China Sea in 2007. This paper attempts to understand the paleoceanic and paleoclimate evolution history in the region since the late last glacial epoch. The results showed that benthic foraminifera were distributed continuously in columnar sediments of site Site 6A, and the dominant genera were prominent, abundance and differentiation fluctuated obviously. The bottom boundary of the sediments is about 50 MIS2 in the MIS3 period and the highest deposition rate in the Holocene is 13.37 cm / kg. During the MIS2 period there may be stratigraphic defects caused by hydrate decomposition. The oxygen and carbon isotopic characteristics of foraminifera recovered the climatic cycle and ice sheet volume change during the glacial / interglacial period, indicating that the redox status of the sedimentary environment in the sea area was basically unchanged. Based on the analysis of the relative abundance of the benthic foraminifera Uvigerinia Cibicidoides Bulimina, combined with the percentage content of porcelain shell and the carbon isotope of planktonic foraminifera, it is concluded that the enhancement of 40kaBP East Asian Summer Monsoon during the last glacial period brought a great deal of rainfall. The high value of paleoproductivity due to the increase of land runoff may be related to the strong winter monsoon carrying a large amount of continental clastic deposits, and the water masses with low temperature, low oxygen and high nutrients in the North Atlantic will have a greater influence on the station.
【作者單位】： 中國科學(xué)院天然氣水合物重點(diǎn)實(shí)驗(yàn)室中國科學(xué)院廣州能源研究所;中國科學(xué)院大學(xué);國土資源部天然氣水合物重點(diǎn)實(shí)驗(yàn)室青島海洋地質(zhì)研究所;海洋國家實(shí)驗(yàn)室海洋礦產(chǎn)資源評價與探測技術(shù)功能實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(41273022) 中國石油-中科院科技合作項(xiàng)目(2015A-4813) 中國科學(xué)院廣州能源研究所所長創(chuàng)新基金培育專項(xiàng)(y307p51001)
【分類號】：P736.22

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