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首页> 外文期刊>Journal of Asian earth sciences >Authigenesis of vivianite as influenced by methane-induced sulfidization in cold-seep sediments off southwestern Taiwan
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Authigenesis of vivianite as influenced by methane-induced sulfidization in cold-seep sediments off southwestern Taiwan

机译：台湾西南部冷深沉积物中甲烷诱导的硫化作用影响的堇青石的成因

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Authigenesis of iron-rich phosphate nodules occurs in iron-rich cold-seep sediments (MD052911 core) at Yung-An Ridge offshore southwestern Taiwan. Raman, FTIR, and quantitative X-ray energy-dispersive spectroscopic analyses indicate that the phosphate mineral is vivianite (or baricite) and shows Fe/Mg molar ratios spanning from ca. 0.6 to 4.0 and a general down core trend of increasing Fe/Mg ratios. The formation of vivianite is limited to a depth interval of 13-17 mbsf (meters below seafloor) and is most prominent at ～16 mbsf in association with high dissolved iron concentrations and depleted dissolved sulfide below a peak sulfidization zone (enriched in mackinawite and greigite). Alternate growths of vivianite and iron monosulfides and compositional zoning with Mg enriched towards the peripheries of individual nodules occur in the transition from the zone of vivianite mineralization to the sulfidization zone. The crystallization of vivianite below the sulfidization front could have been favored by scavenging of downward diffusive dissolved sulfide from pore waters in the sulfidization zone. Alternate growths and overlapping of the zones of iron monosulfides and vivianite can be attributed to fluctuations of the sulfidization front and methane flux. The discovery of vivianite in the Yung-An Ridge sediments implies that authigenic vivianite can be an important sink for phosphorus burial in cold-seep sediments that have high reactive-iron contents and high sedimentation rates.
机译：富含铁的磷酸盐结核的成因发生在台湾西南沿海永安岭的富含铁的冷深沉积物（MD052911岩心）中。拉曼光谱，傅立叶变换红外光谱和X射线能谱定量分析表明，磷酸盐矿物为堇青石（或重晶石），并且显示Fe / Mg摩尔比范围约为。 0.6 / 4.0以及铁/镁比增加的总体下降趋势。维维石的形成被限制在13-17 mbsf（海床以下的米）的深度范围内，并且在〜16 mbsf时最突出，这与高溶解铁浓度和峰值硫化区以下的贫化溶解硫化物有关（富含马基金矿和辉绿岩）。 ）。在从Vivianite矿化区到硫化区的过渡过程中，Vivianite和单硫化铁交替生长，并向单个结核周围富集了Mg的成分区带。从硫化区孔隙水中清除向下扩散的溶解性硫化物可能有利于在硫化前沿以下的堇青石结晶。单硫化铁和堇青石区域的交替生长和重叠可以归因于硫化前沿和甲烷通量的波动。在永安岭沉积物中发现了云母石，这表明自生云母可能是活性铁含量高和沉积速率高的冷深沉积物中磷埋藏的重要汇。

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