Using iron speciation in authigenic carbonates from hydrocarbon seeps to trace variable redox conditions
Using iron speciation in authigenic carbonates from hydrocarbon seeps to trace variable redox conditions
复制标题
利用碳氢化合物渗漏中的自生碳酸盐中的铁形态来追踪可变的氧化还原条件
DOI：
10.1016/j.marpetgeo.2015.05.001
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发表时间：
2015-11
影响因子：
4.2
通讯作者：
Chen Duofu
中科院分区：
文献类型：
--
作者：
Chen Linying;Zheng Guodong;Peckmann Jorn;Chen Duofu
富烃流体从海洋沉积柱中渗流的特征是流动强度随时间的变化和由此产生的空间可变的氧化还原条件。海洋油气渗漏中的自生碳酸盐岩提供了极好的地质和地球化学档案，有助于探索随时间推移的渗漏动力学。在这项研究中，我们调查了潜在的穆斯堡尔光谱和Fe含量的渗漏相关的自生碳酸盐从刚果风扇，墨西哥湾和黑海重建过去的氧化还原条件和流体渗漏活动在冷渗漏。穆斯堡尔谱和Fe含量的变化表明：（1）刚果扇碳酸盐沉积于硫化物环境;（2）墨西哥湾渗漏点渗漏碳酸盐的形成条件是多变的，从好氧到亚氧和缺氧，甚至跨越到产甲烷带;（3）黑海的分层水体或亚氧条件导致黑海碳酸盐岩中Fe含量较低。研究表明，铁形态可以提供限制范围广泛的氧化还原条件，印迹渗漏碳酸盐在生命周期的渗流。同样，穆斯堡尔谱学-特别是当与氧化还原敏感元素的分析结合使用时-是一种有前途的工具，可以追踪海洋古环境中的可变氧化还原条件，而不是渗漏。
Seepage of hydrocarbon-rich fluids out of the marine sedimentary column is characterized by temporal changes of flow intensity and resultant spatially variable redox conditions. Authigenic carbonates at marine hydrocarbon seeps provide excellent geological and geochemical archives that serve to explore seepage dynamics over time. In this study, we investigated the potential of Mössbuaer spectroscopy and Fe contents of seep-related authigenic carbonates from the Congo Fan, the Gulf of Mexico, and the Black Sea for reconstructing past redox conditions and fluid seepage activity at cold seeps. The Fe speciation observed by Mössbauer spectroscopy and Fe contents suggest that (1) the Congo Fan carbonates precipitated in a sulfidic environment, (2) the formation conditions of seep carbonates were variable at the Gulf of Mexico seep site, ranging from oxic to suboxic and anoxic and even spanning into the methanogenic zone, and (3) the stratified water column of the Black Sea or suboxic condition resulted in low Fe contents of Black Sea carbonates. The study reveals that Fe speciation can provide constraints on the wide range of redox conditions that imprinted seep carbonates during the life span of seepage. Similarly, Mössbauer spectroscopy – particularly when used in combination with the analysis of redox-sensitive elements – is a promising tool to trace variable redox conditions in marine paleoenvironments other than seeps.
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影响因子：
64.8
作者：
N. N. Greenwood-N.
通讯作者：
N. N. Greenwood-N.
影响因子：
7.4
作者：
Sahi Ram;K. Patel;S. Sharma;R. P. Tripathi
通讯作者：
Sahi Ram;K. Patel;S. Sharma;R. P. Tripathi
影响因子：
18.3
作者：
Joye, Samantha B.;Samarkin, Vladimir A.;Meile, Christof D.
通讯作者：
Meile, Christof D.
影响因子：
3
作者：
G. Zheng;Y. Lang;B. Takano;M. Matsuo;A. Kuno;H. Tsushima
通讯作者：
G. Zheng;Y. Lang;B. Takano;M. Matsuo;A. Kuno;H. Tsushima
影响因子：
5.8
作者：
Daniel C. Pope;S. Willett
通讯作者：
Daniel C. Pope;S. Willett