The distribution characteristics of rare metal elements in surface sediments from four coastal bays on the northwestern South China Sea
The distribution characteristics of rare metal elements in surface sediments from four coastal bays on the northwestern South China Sea
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DOI：
10.1016/j.ecss.2015.12.001
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发表时间：
2016-02
影响因子：
2.8
通讯作者：
Shuhong Wang;Jin Li;Shuzhuang Wu;Wenjie Yan;Weixia Huang;Li Miao;Zhong-rong Chen
中科院分区：
文献类型：
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作者：
Shuhong Wang;Jin Li;Shuzhuang Wu;Wenjie Yan;Weixia Huang;Li Miao;Zhong-rong Chen
通过对南海西北部沿着4个海湾表层沉积物中Zr、Sn、Ti、Y、Nb、Ta、Ce、La、Nd、Th等稀有金属元素的分布特征的研究，可以推断其主要控制因素及其作为金属砂矿的成矿潜力。结果表明，它们在表层沉积物中的含量差异很大，但具有明显的地理分布规律。各元素的平均含量由东向西逐渐降低，雷州湾最低，湛江湾最高，Sn、Ti、Nb、Ta最高，海陵湾最高，Zr、Y、La、Ce、Nd、Th最高。最东端的两个海湾（海陵湾和水东湾）中这些元素的相对富集是由于西南向沿岸流将华南花岗岩区的陆源沉积物排入这两个海湾所致。各元素含量与沉积物细颗粒（<63 μm）的相关分析结果表明，控制Ti、Nb、Sn分布的主要因素是沉积物细颗粒，而Zr、Y、La、Ce、Nd、Th则是重矿物和/或生物碎屑的富集，Ta可能受两者的共同影响。详细分析表明，海陵湾沉积物中可能含有丰富的锆石、磷钇矿、钛铁矿（或金红石）、磷钇矿、独居石、铌钽铁矿等稀有金属矿物，具有较好的稀有金属砂矿资源前景，锆石、磷钇矿和独居石在水东湾及张鉴湾局部地区也可能具有较好的成矿前景。
The distribution of rare metal elements (Zr, Sn, Ti, Y, Nb, Ta, Ce, La, Nd and Th) in surface sediments from four bays along the northwestern coast of the South China Sea allowed infer their main controlling factors and their mineralization potential as metals placer. The results revealed that their contents in surface sediments are very variable but show a clear geographic regularity. The average content of all elements in those areas decreases from the East to the West, with the minimum value of all elements in Leizhou Bay, the maximum value of Zr, Y, La, Ce, Nd and Th in Zhanjiang Bay, and the maximum values of Sn, Ti, Nb and Ta in Hailing Bay. The relative enrichment of these elements in two easternmost bays (Hailing Bay and Shuidong Bay) are attributed to the southwest alongshore current, which drain and transport terrigenous sediments from the granite region of the South China into these two bays. The correlation results between all element contents and fine sediment fraction (<63 μm) suggested that the main factors controlling the distribution of Ti, Nb and Sn should be the fine fraction of the sediment, but alternatively Zr, Y, La, Ce, Nd and Th are rich in heavy minerals and/or bioclasts, and Ta maybe affected by both. Detail analysis shows that sediments from Hailing Bay may contain abundant zircon, cassiterite, ilmenite (or rutile), xenotime, monazite, niobium tantalite and other rare metal minerals, with a good prospect as a rare metal placer resource, and the zircon, xenotime and monazite may also have good metallogenic prospects in Shuidong Bay and in the local area of Zhangjian Bay.