Abundances of rare earth elements in crude oils and their partitions in water
Abundances of rare earth elements in crude oils and their partitions in water
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DOI：
10.2343/geochemj.1.0083
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发表时间：
2010-10
影响因子：
0.8
通讯作者：
R. Nakada;Y. Takahashi;G. Zheng;Yuhei Yamamoto;H. Shimizu
中科院分区：
文献类型：
--
作者：
R. Nakada;Y. Takahashi;G. Zheng;Yuhei Yamamoto;H. Shimizu
本文首次报告了从中国新疆省泥火山收集的原油和共存水中的整个稀土元素范围。当归一化为球粒陨石时，原油显示出轻稀土元素富集模式，而重稀土元素则平坦或贫化模式。原油中的稀土元素浓度比共存水中的稀土元素浓度高出一百多倍。考虑到油的疏水性和稀土元素的高离子特性，强烈建议稀土元素与原油中存在的配体形成络合物。根据 13 C NMR 谱发现，原油样品中含有少量苯酚和羧基，可能为 REE 提供络合位点。原油的稀土元素模式与从同一泥火山采集的共存泥浆样品的稀土元素模式相似，这表明原油中的稀土元素来自于生成原油的岩石和沉积物。
Patterns of the entire range of REE in crude oils and coexisting water, collected from mud volcanoes in Xinjiang Province of China, are reported here for the first time. Crude oils show light REE enriched patterns with flat or depleted patterns in heavy REE, when normalized to chondrite. The REE concentrations in crude oils are larger than those in coexisting water by a factor of more than one hundred. Considering the hydrophobicity of oil and the high ionic characteristics of REE, it is strongly suggested that REE form complexes with ligands present in the crude oils. Based on the 13 C NMR spectroscopy, it is found that small amounts of phenol and carboxyl groups are contained in the crude oil samples, which could possibly provide complexing sites for REE. REE patterns of crude oils are similar to those of coexisting mud samples collected from the same mud volcanoes, which suggests that the REE in crude oils are derived from rocks and sediments where crude oils were generated.