| Qiu Zhongrong,Dong Yanhui,Ma Weilin,Zhang Weiyan,Yang Kehong,Zhao Hongqiao. 2020. Geochemical characteristics of platinum-group elements in polymetallic nodules from the Northwest Pacific Ocean. Acta Oceanologica Sinica, 39(8):34－42 |
| Geochemical characteristics of platinum-group elements in polymetallic nodules from the Northwest Pacific Ocean |
| 西北太平洋多金属结核铂族元素地球化学特征 |
| Received:February 20, 2020 |
| DOI：10.1007/s13131-020-1616-y |
| Key words:platinum-group elements polymetallic nodules Co-rich crusts Marcus-Wake Seamount |
| 中文关键词: 铂族元素 多金属结核 富钴结壳 马尔库斯-威克海山区 |
| 基金项目:China Ocean Mineral Resources R&D Association (COMRA) Project under contract Nos DY135-C1-1-05, DY135-N1-1-06 and DY135-C1-1-02; the Scientific Research Fund of the Second Institute of Oceanography, MNR under contract No. JT1304. |
| Author Name | Affiliation | E-mail | | Qiu Zhongrong | Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, China
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | Dong Yanhui | Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, China
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | dongyh@sio.org.cn | | Ma Weilin | Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, China
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | Zhang Weiyan | Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, China
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | Yang Kehong | Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, China
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | Zhao Hongqiao | Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, China
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | |
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| Abstract: |
| Polymetallic nodules and cobalt (Co)-rich crusts are enriched in platinum-group elements (PGEs), especially platinum (Pt) and may be important sinks of PGEs. At present, little information is available on PGEs in polymetallic nodules, and their geochemical characteristics and the causes of PGEs enrichment are unclear. Here, PGEs of polymetallic nodules from abyssal basin in the Marcus-Wake Seamount area of the Northwest Pacific Ocean are reported and compared with the published PGEs data of polymetallic nodules and Co-rich crusts in the Pacific. The total PGEs (ΣPGE) content of polymetallic nodules in study area is 258×10–9 in average, markedly higher than that of Clarion-Clipperton Zone (CCZ) nodules (ΣPGE=127×10–9) and lower than that of Co-rich crusts in the Marcus-Wake Seamount (ΣPGE=653×10–9), similar to that of Co-rich crusts in the South China Sea (ΣPGE=252×10–9). The CI chondrite-normalized PGEs patterns in different regions of polymetallic nodules and cobalt-rich crusts are highly consistent, with all being characterized by positive Pt and negative Pd anomalies. These results, together with those of previous studies, indicate that PGEs in polymetallic nodules and Co-rich crusts are mainly derived directly from seawater. Pt contents of polymetallic nodules from the study area are negatively correlated with water depth, and Pt/ΣPGE ratios in nodules there are also lower than those of the Co-rich crusts in the adjacent area, indicating that sedimentary water depth and oxygen fugacity of ambient seawater are the possible important controlling factors for Pt accumulation in crusts and nodules. |
| 中文摘要: |
| 多金属结核与富钴结壳富集铂族元素（PGEs），特别是Pt，可能是海洋中PGEs元素重要的汇。目前，结核中的PGEs数据尚少，PGEs在多金属结核中的地球化学特征及成因还不明确。本文报道了西北太平洋马尔库斯-威克海山区深海盆多金属结核中铂族元素数据，太平洋中已发表的多金属结核与富钴结壳PGEs数据进行了对比。研究区多金属结核PGE平均含量为258.50×10-9，明显高于CC区多金属结核含量（ΣPGE=126.72×10-9），而低于马尔库斯-威克海山富钴结壳的含量（ΣPGE=653.39×10-9），与南海富钴结壳PGE含量相当。不同区域的多金属结核及富钴结壳PGE球粒陨石标准化配分模式非常一致，均表现为Pt正异常和Pd负异常特征，结合前人研究结果，认为多金属结核及富钴结壳中的PGEs应该直接来源于海水。研究区多金属结核Pt与水深呈负相关性，其Pt/ΣPGE也要低于马尔库斯威克海山富钴结壳的值，表明沉积深度和海水氧逸度可能是控制结壳和结核中Pt富集重要因素。 |
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