Iron shuttle controls on molybdenum, arsenic, and antimony enrichment in Pliocene methane-seep carbonates from the southern Western Foothills, Southwestern Taiwan
Iron shuttle controls on molybdenum, arsenic, and antimony enrichment in Pliocene methane-seep carbonates from the southern Western Foothills, Southwestern Taiwan
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铁梭控制台湾西南山麓南部上新世甲烷渗漏碳酸盐岩中钼、砷和锑的富集
DOI：
10.1016/j.marpetgeo.2018.11.011
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发表时间：
2019-02
期刊：
影响因子：
--
通讯作者：
Jörn Peckmann
中科院分区：
文献类型：
--
作者：
Qinxian Wang;Duofu Chen;Jörn Peckmann
某些微量金属在冷烃渗漏的沉积物和孔隙流体中异常富集。最近的研究将这种异常，特别是钼（Mo）、砷（As）和锑（Sb）的异常归因于锰和铁的氢氧化物的所谓微粒穿梭过程。然而，关于这种机制的普遍性仍然存在一些不确定性，并且很难普遍排除深层上升流体对微量金属富集的影响。台湾西南部西部山麓南部上新世佳县渗漏碳酸盐是通过流体中所含甲烷的厌氧氧化而沉淀的，没有证据表明有深部上升流体的混合物。因此，这些自生碳酸盐代表了一个很好的例子，探讨颗粒穿梭过程中的微量金属富集的作用。佳县渗漏碳酸盐岩显示出强烈的自生钼相对于铀（U）的富集，反映在高钼/铀比，远远高于海水。这种模式的Mo单键U的协变是最好的解释弱粒子穿梭过程中操作的嘉县渗漏碳酸盐岩的形成。此外，渗漏碳酸盐显示异常的Mo，As和Sb富集，没有U富集和前三种微量金属和活性铁之间的强烈的协变。这些研究结果表明，铁羟基氧化物颗粒穿梭确实发挥了内在的作用，在富集钼，砷，锑在上新世渗漏。我们的研究结果证实了铁粒子穿梭对海洋冷泉地球化学的潜在重要性，但控制粒子穿梭的存在或不存在的因素还不够了解，需要更多的研究在未来的渗漏痕量金属螯合。
Certain trace metals are anomalously enriched in sediments and pore fluids at cold hydrocarbon seeps. Recent studies ascribed such anomalies, particularly those of molybdenum (Mo), arsenic (As), and antimony (Sb), to so-called particulate shuttle processes by manganese and iron oxyhydroxides. However, there are still some uncertainties about the prevalence of this mechanism, and it is difficult to generally rule out an influence of deep ascending fluids on trace metal enrichments. The Pliocene Chiahsien seep carbonates from the southern Western Foothills of Southwestern Taiwan were precipitated through anaerobic oxidation of methane contained in fluids that yielded no evidence for an admixture of deep ascending fluids. These authigenic carbonates consequently represent a good example to explore the role of particulate shuttle processes on the enrichments of trace metals. The Chiahsien seep carbonates reveal strong enrichment of authigenic Mo relative to uranium (U), reflected in high Mo/U ratios that are much higher than those of seawater. Such a pattern of Mosingle bondU covariation is best explained by a weak particulate shuttle process that operated during the formation of the Chiahsien seep carbonates. Furthermore, the seep carbonates show exceptional Mo, As, and Sb enrichments with no U enrichment and strong covariations between the former three trace metals and reactive iron. These findings indicate that iron oxyhydroxide particulate shuttles indeed played an intrinsic role in the enrichments of Mo, As, and Sb at the Pliocene seeps. Our findings confirm the potential importance of iron particulate shuttles on the biogeochemistry of marine cold seeps, but the factors governing the presence or absence of particulate shuttles are insufficiently understood and require more research on trace metal sequestration at seeps in the future.
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影响因子：
56.9
作者：
C. Paull;B. Hecker;R. Commeau;R. P. Freeman-Lynde;C. Neumann;W. Corso;S. Golubić;J. Hook;
通讯作者：
C. Paull;B. Hecker;R. Commeau;R. P. Freeman-Lynde;C. Neumann;W. Corso;S. Golubić;J. Hook;
影响因子：
1.7
作者：
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通讯作者：
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影响因子：
3.7
作者：
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通讯作者：
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影响因子：
2.9
作者：
H. Sato;Ken‐ichiro Hayashi;Y. Ogawa;K. Kawamura
通讯作者：
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影响因子：
0.8
作者：
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通讯作者：
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