Rare earth element distributions in the West Pacific: Trace element sources and conservative vs. non-conservative behavior
Rare earth element distributions in the West Pacific: Trace element sources and conservative vs. non-conservative behavior
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DOI：
10.1016/j.epsl.2018.01.016
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发表时间：
2018-03-15
影响因子：
5.3
通讯作者：
Brumsack, Hans-Juergen
中科院分区：
文献类型：
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作者：
Behrens, Melanie K.;Pahnke, Katharina;Brumsack, Hans-Juergen
最近的研究表明，运输和水团混合可能在控制溶解稀土元素浓度（[REE]）的分布中发挥主导作用，至少在北大西洋和南大西洋以及南太平洋的部分地区。在这里，我们报告的垂直和空间高分辨率剖面溶解稀土元素浓度（[REE]）沿着西北-东南样带在西太平洋和检查过程中影响[REE]分布在这一地区。地表水稀土元素模式揭示了微量元素（TE）输入韩国附近的热带赤道西太平洋的来源。正铕异常和中稀土富集在地表和地下沃茨是指示TE输入火山岛和指纹详细的小规模赤道纬向东运输的TE的铁有限的热带东太平洋。南北太平洋热带沃茨和南极中层水的低[REE]是一个长期的（即，在北太平洋中层水中，[REE]随深度增加，是由于颗粒的释放。深层到底层沃茨的最佳多参数分析表明，在较低的绕极深层水（>3000 m水深：75-100%由水团混合解释）的深度，[REE]的横向运输和混合的主导控制，允许向北追踪LCDW到28 N在西北太平洋。与此相反，在Lau盆地和汤加-斐济地区的热液羽流在1500-2000米水深的清除导致[REE]赤字（类似于40-60%的去除）和显着的REE分馏在热带西太平洋。总的来说，我们的数据提供了证据，韩国和巴布亚新几内亚附近的活动微量元素输入，并为强大的横向运输成分溶解稀土元素在西太平洋的大部分地区的分布。(C)2018爱思唯尔B. V.保留所有权利。
Recent studies suggest that transport and water mass mixing may play a dominant role in controlling the distribution of dissolved rare earth element concentrations ([REE]) at least in parts of the North and South Atlantic and the Pacific Southern Ocean. Here we report vertically and spatially high-resolution profiles of dissolved REE concentrations ([REE]) along a NW-SE transect in the West Pacific and examine the processes affecting the [REE] distributions in this area. Surface water REE patterns reveal sources of trace element (TE) input near South Korea and in the tropical equatorial West Pacific. Positive europium anomalies and middle REE enrichments in surface and subsurface waters are indicative of TE input from volcanic islands and fingerprint in detail small-scale equatorial zonal eastward transport of TEs to the iron-limited tropical East Pacific. The low [REE] of North and South Pacific Tropical Waters and Antarctic Intermediate Water are a long-range (i.e., preformed) laterally advected signal, whereas increasing [REE] with depth within North Pacific Intermediate Water result from release from particles. Optimum multiparameter analysis of deep to bottom waters indicates a dominant control of lateral transport and mixing on [REE] at the depth of Lower Circumpolar Deep Water (>3000 m water depth: 75-100% explained by water mass mixing), allowing the northward tracing of LCDW to 28 N in the Northwest Pacific. In contrast, scavenging in the hydrothermal plumes of the Lau Basin and Tonga-Fiji area at 1500-2000 m water depth leads to [REE] deficits (similar to 40-60% removal) and marked REE fractionation in the tropical West Pacific. Overall, our data provide evidence for active trace element input both near South Korea and Papua New Guinea, and for a strong lateral transport component in the distribution of dissolved REEs in large parts of the West Pacific. (C) 2018 Elsevier B.V. All rights reserved.