冷泉碳酸盐岩的稀土元素地球化学特征及氧化还原条件示踪*

doi:10.11978/j.issn.1009-5470.2012.05.006

热带海洋学报 ›› 2012, Vol. 31 ›› Issue (5): 37-44.doi: 10.11978/j.issn.1009-5470.2012.05.006cstr: 32234.14.j.issn.1009-5470.2012.05.006

冷泉碳酸盐岩的稀土元素地球化学特征及氧化还原条件示踪*

卞友艳1,3, 林治家1,3, 冯东1,2, 陈多福1,2

1. 中国科学院广州地球化学研究所边缘海地质重点实验室, 广东广州 510640;2. 中国科学院南海海洋研究所边缘海地质重点实验室, 广东广州 510301; 3. 中国科学院大学, 北京 100049

收稿日期:2011-03-10 修回日期:2011-04-19 出版日期:2012-11-01 发布日期:2013-02-06
通讯作者: 陈多福(1962—), 男, 研究员, 从事海底冷泉和天然气水合物研究。E-mail: cdf@gig.ac.cn。
作者简介:卞友艳(1986—), 女, 江苏省盐城市人, 博士研究生, 主要从事海洋地质研究。
基金资助:
中国科学院重要方向项目(KZCX2-YW-GJ03); 中国科学院百人计划(Y2SL091001);中国科学院广州地球化学研究所 “135”项目(Y234021001)；广东省科技计划项目（(2011A080403021)

Rare earth elements of seep carbonates and using them to trace redox variation at seep sites

BIAN You-yan1,3, LIN Zhi-jia1,3, FENG Dong1,2, CHEN Duo-fu1,2

1. Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; 2. Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2011-03-10 Revised:2011-04-19 Online:2012-11-01 Published:2013-02-06

摘要/Abstract

摘要： 在海底冷泉活动区渗漏甲烷被细菌缺氧氧化为HCO3^-, 产生碳酸盐岩沉淀, 同时消耗沉积物孔隙水中的硫酸根离子, 从而改变沉积环境的氧化还原条件。墨西哥湾和刚果扇的现代冷泉碳酸盐岩及摩洛哥Hollard Mound中泥盆统和意大利Marmorito中新统冷泉碳酸盐岩的泥晶和亮晶碳酸盐矿物的稀土元素(rare earth element, REE)总量(?REE)质量分数变化范围较大(0.3×10^-6—43.7×10^-6), 泥晶的?REE高于亮晶碳酸盐矿物。稀土元素页岩标准化配分模式具有不同的Ce异常特征, 即使在同一地点采集的样品也表现出不同的Ce异常, 显示了冷泉活动区海底除目前认识到的还原环境外, 至少存在局部和短暂的氧化环境。氧化还原条件的改变可能与冷泉流体流动速率变化有关, 或与甲烷缺氧氧化伴生的反硝化作用产生的氧有关。

关键词: 冷泉碳酸盐岩, 氧化还原条件, 稀土元素示踪

Abstract: At marine seeps, methane is microbially oxidized resulting in the precipitation of carbonate close to the seafloor. Methane oxidation leads to sulfate depletion in sediment pore water and induces change in redox conditions. Rare earth element (REE) patterns of authigenic carbonate phases from limestone collected from modern seeps of the Gulf of Mexico and the Congo Fan, as well as from two ancient hydrocarbon-seep localities, Hollard Mound (Middle Devonian) and Marmorito (Miocene), were investigated. The total REE content (?REE) of seep carbonates varies widely from 0.3×10^-6 to 43.7×10^-6, with a common trend that the ?REE in microcrystalline phases is higher than that in sparite cement. The shale-normalized REE patterns of seep carbonates often show different Ce anomalies, even in the samples from the same site. These varied Ce anomalies suggested that the redox conditions of seep carbonates are variable and complex. Overall, our results show that oxic conditions are at least temporarily common in seep environment. The varied redox conditions might be related to the changes of flux of seep fluid or the denitrification associated with methane oxidation that produces oxygen.

Key words: seep carbonates, redox variation, rare earth elements

卞友艳,林治家,冯东,陈多福,. 冷泉碳酸盐岩的稀土元素地球化学特征及氧化还原条件示踪*[J]. 热带海洋学报, 2012, 31(5): 37-44.

BIAN You-yan,LIN Zhi-jia,FENG Dong,CHEN Duo-fu,. Rare earth elements of seep carbonates and using them to trace redox variation at seep sites[J]. Journal of Tropical Oceanography, 2012, 31(5): 37-44.

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冷泉碳酸盐岩的稀土元素地球化学特征及氧化还原条件示踪*

Rare earth elements of seep carbonates and using them to trace redox variation at seep sites

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