本文選題：重金屬 + 粒度�。� 參考：《海洋地質(zhì)與第四紀(jì)地質(zhì)》2016年01期

【摘要】：對珠江口內(nèi)伶仃洋不同海域3個柱狀樣沉積物進行的210 Pb測年和重金屬分布特征垂向變化分析;研究了近百年來珠江口沉積速率時空變化;探討了在自然作用和人類活動影響下重金屬分布特點和累積因素。結(jié)果表明,珠江口內(nèi)伶仃洋海域東西兩岸的沉積物平均粒徑4~7.5Φ,橫門和深圳海域沉積物敏感組分呈現(xiàn)出顯著雙峰分布,粗細(xì)組分分界線為5.25Φ,淇澳島沉積物敏感組分不明顯,沉積環(huán)境較為穩(wěn)定。基于210Pb測年的CIC模式,獲得了各個巖心的現(xiàn)代沉積速率,橫門海域沉積速率1.6cm/a,淇澳島海域沉積速率4.08cm/a,0~70cm深度內(nèi)深圳西海岸海域沉積速率2.58cm/a,70cm以深沉積速率為4.47cm/a。重金屬含量分析表明,Cr、Ni、Cu、Zn和Pb含量從1923—1986年維持較高水平,但是變化不大;1967—1983年的深圳海域和1983—2004年的淇澳島海域,各重金屬元素含量快速上升;進入2000年以后,2003—2005年和2008—2012年,重金屬含量呈現(xiàn)逐年減小趨勢,2005—2008年則表現(xiàn)為逐年上升;這些變化與沿岸的社會經(jīng)濟發(fā)展、重金屬入海量緊密相關(guān)。
[Abstract]:The 210 Pb dating of 3 columnar sediments in the different waters of the Pearl River Estuary and the vertical variation of the distribution characteristics of heavy metals in the Pearl River Estuary were analyzed. The temporal and spatial changes in the deposition rate of the Pearl River Estuary were studied in the last hundred years, and the distribution and accumulation of heavy metals under the influence of natural and human activities were discussed. The results showed that the Pearl River Estuary was in the estuary of the Pearl River Estuary. The average grain size 4~7.5 diameter of the sediments on both sides of the East and west regions is 4~7.5. The sensitive components of the sediments in the cross gate and the Shenzhen sea area show a significant Shuangfeng distribution, the boundary of the coarse and fine components is 5.25. The sediment sensitive components of Qiao island are not obvious, and the sedimentary environment is more stable. Based on the CIC model of 210Pb dating, the modern sedimentation rate of each core is obtained, and the cross gate sea area is obtained. Sedimentation rate is 1.6cm/a, the sedimentation rate of Qiao island sea area is 4.08cm/a, the sedimentation rate of Shenzhen west coast is 2.58cm/a in the depth of 0~70cm. 70cm with the deep deposition rate of 4.47cm/a. heavy metal content analysis shows that the content of Cr, Ni, Cu, Zn and Pb maintains a high level from 1923 to 1986, but the change is not great; Shenzhen sea area of 1967 - 1983 and 1983 - 2004 The content of heavy metals in the waters of Qiao island rose rapidly. After 2000, from 2003 to 2005 and from 2008 to 2012, the content of heavy metals showed a decreasing trend year by year, and from 2005 to 2008, the content of heavy metals increased year by year. These changes were closely related to the social and economic development along the coast and the amount of heavy metals into the sea.
【作者單位】： 國土資源部海底礦產(chǎn)資源重點實驗室中國地質(zhì)調(diào)查局廣州海洋地質(zhì)調(diào)查局;海岸與海島開發(fā)教育部重點實驗室南京大學(xué)地理與海洋科學(xué)學(xué)院;
【基金】：國土資源部海底礦產(chǎn)資源重點實驗室開放基金(基金號:KLMMR-2014-A-08) 中國地質(zhì)調(diào)查局地質(zhì)調(diào)查項目(GZH20120202)
【分類號】：P736.4;X55

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