本文選題：沉積物成分 + 堆積速率��； 參考：《中國科學(xué):地球科學(xué)》2017年08期

【摘要】：通過對南海北部深水?dāng)嗝嫔螹D12-3428(水深903m)、MD12-3433(水深2125m)和MD12-3434(水深2995m)三個巖芯的沉積物成分及其堆積速率分析,研究末次冰期以來南海深水沉積物組成和堆積速率的時空變化特征及其控制因素.研究結(jié)果顯示,南海北部末次冰期以來的深水沉積物主要由陸源碎屑(59~89%)和碳酸鹽(6~38%)組成,并含有少量蛋白石(1.6~9.4%)和有機(jī)質(zhì)(0.7~1.9%).陸源碎屑和碳酸鹽的堆積速率分別達(dá)到2.4~21.8和0.4~6.5g cm~( 2) ka~( 1)范圍,比蛋白石和有機(jī)質(zhì)堆積速率高出1~2個數(shù)量級.在末次冰期以來的時間序列變化上,沉積物各成分含量及其堆積速率都具有冰期-間冰期的旋回變化,陸源碎屑、蛋白石和有機(jī)質(zhì)的含量及其堆積速率在氧同位素2期顯著增加,而碳酸鹽的含量及其堆積速率則呈反向變化或增幅不明顯,表明南海深水碳酸鹽含量在低海平面時期受到陸源碎屑稀釋的影響.在從陸坡向深海盆的空間變化上,陸源碎屑的含量在同時期隨水深的增加而增加,但其堆積速率銳減;碳酸鹽含量及其堆積速率則隨水深的增加而遞減;而有機(jī)質(zhì)和蛋白石的含量及其堆積速率隨水深增加呈現(xiàn)復(fù)雜的變化特征.本文研究認(rèn)為,南海北部末次冰期以來深水沉積物的組成及其堆積速率受到海平面變化的強(qiáng)烈控制,季風(fēng)降雨引起的陸源物質(zhì)供給、海洋初級生產(chǎn)力、以及陸源碎屑和海洋生源物質(zhì)的相互稀釋作用,共同影響了南海深水沉積物的堆積過程.
[Abstract]:The sediment composition and accumulation rate of three cores, MD12-3428 (water depth 903m) and MD12-3434 (water depth 2995m), are analyzed in the deep water section of the northern South China Sea. The temporal and spatial variation characteristics and controlling factors of the composition and accumulation rate of deep-water sediments in the South China Sea since the last glacial period were studied. The results show that the deep-water sediments in the northern part of the South China Sea since the last glacial period are mainly composed of continental clastic rocks (59.89) and carbonates (638) and contains a small amount of opal (1.69.4g) and organic matter (0.71.9g). The accumulation rates of continental clastic and carbonate are within the range of 2.4 ~ 21.8 and 0.4 ~ 6.5g / cm ~ (-1), respectively, which are 1 ~ 2 orders of magnitude higher than those of opal and organic matter. In the time series changes since the last glacial period, the contents and accumulation rates of each component of the sediment have the cycle variation of glacial to interglacial period, and the continental clastic, The content and accumulation rate of opal and organic matter increased significantly in the second phase of oxygen isotope, while the content and accumulation rate of carbonate changed inversely or did not increase obviously. The results show that the carbonate content in the deep water of the South China Sea is affected by continental clastic dilution at low sea level. In the spatial variation from the continental slope to the deep-sea basin, the content of continental clastic increases with the increase of water depth, but its accumulation rate decreases sharply, while the carbonate content and accumulation rate decrease with the increase of water depth. However, the content of organic matter and opal and its accumulation rate show complex characteristics with the increase of water depth. In this paper, it is concluded that the composition and accumulation rate of deep-water sediments in the northern South China Sea since the last glacial period are strongly controlled by sea level changes, the supply of land-based materials caused by monsoon rainfall, and the marine primary productivity. The mutual dilution of terrestrial clasts and marine biogenic materials affects the accumulation of deep-water sediments in the South China Sea.
【作者單位】： 同濟(jì)大學(xué)海洋地質(zhì)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(批準(zhǔn)號:91528304,41530964,91428310,41525020)資助
【分類號】：P736.21

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