Rare earth element geochemistry characteristics of seawater and porewater from deep sea in western Pacific.

Deep-sea REE cycling and their indicative significance Historically, riverine inputs were considered as the primary source of REEs to seawater 18 – 20 and could be transported to marine via particles, solution and colloids with a total concentration of 39 × 10 6 mol/y 73 .

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The contents of REE (ΣREE) are low in seawater (31.8–168 pmol/L) and display an increasing trend with depth (Fig. 2 ), similar to previously published REE data 28 , 44 – 49 (Fig. 3 ).

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