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Formation and origin of Fe–Si oxyhydroxide deposits at the ultra-slow spreading Southwest Indian Ridge
Deep Sea Research Part I: Oceanographic Research Papers ( IF 2.4 ) Pub Date : 2021-02-18 , DOI: 10.1016/j.dsr.2021.103491
Kaiwen Ta , Zijun Wu , Xiaotong Peng , Zhaofu Luan , Shun Chen

Low-temperature hydrothermal systems are generally dominated by Fe–Si oxyhydroxide deposits. However, the formation process and mechanism of modern hydrothermal Fe–Si oxyhydroxides at ultra-slow spreading centers remain poorly understood. This study focused on six Fe–Si oxyhydroxide deposits collected from different sites at a typical ultra-slow spreading center, the Southwest Indian Ridge (SWIR). The mineralogical and geochemical evidence showed significant characteristics of a low-temperature hydrothermal origin. Sr and Nd isotope compositions of Fe–Si oxyhydroxide deposits at the SWIR probably reflected a combined signature of the hydrothermal fluids and seawater. Pb in the Fe–Si oxyhydroxides exhibited a close association with the substrate rocks and seawater. The Mössbauer spectra and iron speciation data further provided insights into iron-bearing phases in all deposits. Two different types of biomineralized forms were also discovered in these deposits by scanning electron microscopy (SEM) analysis. Energy-dispersive X-ray spectroscopy (EDS) and nanoscale secondary ion mass spectrometry (nanoSIMS) revealed that distinct biogenic structures were mainly composed of Fe, Si, and O, together with some trace elements. Based on these findings, we propose that microbial activity plays a significant role in the formation of Fe–Si oxyhydroxides at the ultra-slow spreading SWIR.



中文翻译:

Fe-Si羟基氢氧化物沉积物的形成和成因,分布于印度西南部超慢蔓延的山脊上

低温热液系统通常以Fe-Si羟基氧化物沉积为主。然而,对现代水热Fe-Si羟基氧化物在超慢扩散中心的形成过程和机理仍知之甚少。这项研究的重点是从典型的超慢扩散中心西南印第安岭(SWIR)的不同地点收集的六种Fe-Si羟基氧化铁矿床。矿物学和地球化学证据显示出低温热液成因的显着特征。SWIR处Fe-Si羟基氧化物的Sr和Nd同位素组成可能反映了热液和海水的综合特征。Fe-Si羟基氧化物中的Pb与基底岩石和海水密切相关。Mössbauer光谱和铁形态数据进一步提供了对所有矿床含铁相的见解。通过扫描电子显微镜(SEM)分析,在这些矿床中还发现了两种不同类型的生物矿化形式。能量色散X射线能谱(EDS)和纳米级二次离子质谱(nanoSIMS)表明,独特的生物结构主要由Fe,Si和O以及一些微量元素组成。根据这些发现,我们认为微生物活性在超慢扩散SWIR的Fe-Si羟基氧化铁的形成中起着重要作用。能量色散X射线能谱(EDS)和纳米级二次离子质谱(nanoSIMS)表明,独特的生物结构主要由Fe,Si和O以及一些微量元素组成。根据这些发现,我们认为微生物活性在超慢扩散SWIR的Fe-Si羟基氧化铁的形成中起着重要作用。能量色散X射线光谱(EDS)和纳米级二次离子质谱(nanoSIMS)表明,不同的生物结构主要由Fe,Si和O以及一些微量元素组成。基于这些发现,我们认为微生物活性在超慢扩散SWIR的Fe-Si羟基氧化铁的形成中起着重要作用。

更新日期:2021-03-26
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