西南太平洋劳盆地东北部火山岛弧热液区羽流中Zn形态分布特征

P736; 海底热液流体富含多种金属元素,可能是海洋中金属元素的重要来源之一.对西南太平洋劳盆地东北部火山岛弧两种不同类型热液系统(水岩反应形成的高温热液系统和受岩浆挥发份影响的低温热液系统)羽流中Zn元素的形态进行了分析,包括颗粒态(pZn)、溶解态(dZn)和胶体态Zn(cZn).结果表明由于水岩反应形成的高温热液流体中H2S浓度较高,导致热液羽流中含有较高浓度的pZn,其最高浓度可达 16.9 nM,受岩浆挥发份影响的低温热液流体中H2S浓度较低,羽流中pZn浓度亦相对较低,但仍然高于背景海水,即使在扩散至距West Mata海山喷口 5 千米以外的羽流中,pZn浓度仍然可达3.1 nM...

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Published in海洋地质与第四纪地质 Vol. 45; no. 1; pp. 122 - 135
Main Authors 宋江, 王文朋, 王虎
Format Journal Article
LanguageChinese
Published 同济大学海洋地质国家重点实验室,上海 200092 01.02.2025
Subjects
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ISSN0256-1492
DOI10.16562/j.cnki.0256-1492.2024062001

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Abstract P736; 海底热液流体富含多种金属元素,可能是海洋中金属元素的重要来源之一.对西南太平洋劳盆地东北部火山岛弧两种不同类型热液系统(水岩反应形成的高温热液系统和受岩浆挥发份影响的低温热液系统)羽流中Zn元素的形态进行了分析,包括颗粒态(pZn)、溶解态(dZn)和胶体态Zn(cZn).结果表明由于水岩反应形成的高温热液流体中H2S浓度较高,导致热液羽流中含有较高浓度的pZn,其最高浓度可达 16.9 nM,受岩浆挥发份影响的低温热液流体中H2S浓度较低,羽流中pZn浓度亦相对较低,但仍然高于背景海水,即使在扩散至距West Mata海山喷口 5 千米以外的羽流中,pZn浓度仍然可达3.1 nM,表明热液喷发的pZn并没有快速沉淀,而是可以随羽流在海洋中扩散,海底热液系统可能是海洋中pZn的重要来源.羽流中dZn的分析结果表明,两种不同类型的热液区羽流中dZn浓度并无显著差别,且由于热液的输入导致部分羽流样品中dZn浓度高于背景海水,同时由于颗粒态铁的吸附作用,亦导致部分羽流样品中dZn浓度低于背景海水,因此热液羽流可能是海洋中dZn的源或汇.扫描电镜和能谱分析结果表明火山喷发可能是羽流中cZn的重要来源.
AbstractList P736; 海底热液流体富含多种金属元素,可能是海洋中金属元素的重要来源之一.对西南太平洋劳盆地东北部火山岛弧两种不同类型热液系统(水岩反应形成的高温热液系统和受岩浆挥发份影响的低温热液系统)羽流中Zn元素的形态进行了分析,包括颗粒态(pZn)、溶解态(dZn)和胶体态Zn(cZn).结果表明由于水岩反应形成的高温热液流体中H2S浓度较高,导致热液羽流中含有较高浓度的pZn,其最高浓度可达 16.9 nM,受岩浆挥发份影响的低温热液流体中H2S浓度较低,羽流中pZn浓度亦相对较低,但仍然高于背景海水,即使在扩散至距West Mata海山喷口 5 千米以外的羽流中,pZn浓度仍然可达3.1 nM,表明热液喷发的pZn并没有快速沉淀,而是可以随羽流在海洋中扩散,海底热液系统可能是海洋中pZn的重要来源.羽流中dZn的分析结果表明,两种不同类型的热液区羽流中dZn浓度并无显著差别,且由于热液的输入导致部分羽流样品中dZn浓度高于背景海水,同时由于颗粒态铁的吸附作用,亦导致部分羽流样品中dZn浓度低于背景海水,因此热液羽流可能是海洋中dZn的源或汇.扫描电镜和能谱分析结果表明火山喷发可能是羽流中cZn的重要来源.
Abstract_FL Seafloor hydrothermal fluids are rich in various metal elements and could be one of the important sources of metals in the ocean.We investigated Zn species in hydrothermal plumes in different types of hydrothermal systems(water-rock and magmatic-hydrothermal systems)in the northeastern Lau Basin,Southwest Pacific,including particulate Zn(pZn),dissolved Zn(dZn),and colloidal Zn(cZn).Results show that the plumes contained higher pZn concentrations than background seawater(typically<0.5 nM)in maximum of 16.9 nM.In plumes from low-temperature magmatic-hydrothermal systems,pZn concentrations were comparatively low,but still higher than that in background seawater.Even in the plumes that originated from low-temperature venting at West Mata that had dispersed off to over 5 km,the pZn concentration could still reach 3.1 nM,which indicates that pZn did not precipitate rapidly but dispersed in the ocean with the plumes,and the seafloor hydrothermal systems could be one of the sources of pZn in the ocean.The analyses of dZn in the plumes revealed no significant difference in dZn concentration between the two types of hydrothermal systems.Although the input of hydrothermal fluids resulted in higher dZn concentrations in some plume samples compared to background seawater,the adsorption by particulate Fe led to lower dZn concentrations in other plume samples.Therefore,hydrothermal plumes could act as either a source or a sink of dZn in the ocean.Observations in scanning electron microscopy and energy-dispersive X-ray spectroscopy suggest that the cZn in plumes could be from volcanic eruption.
Author 王文朋
王虎
宋江
AuthorAffiliation 同济大学海洋地质国家重点实验室,上海 200092
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WANG Hu
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DocumentTitle_FL The characteristics of Zn species in hydrothermal plumes above arc volcanoes in the Northeast of Lau Basin,Southwest Pacific Ocean
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Keywords 火山岛弧
Zn形态
arc volcano
hydrothermal plume
劳盆地
Zn species
热液羽流
Lau Basin
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PublicationTitle 海洋地质与第四纪地质
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Snippet P736; 海底热液流体富含多种金属元素,可能是海洋中金属元素的重要来源之一.对西南太平洋劳盆地东北部火山岛弧两种不同类型热液系统(水岩反应形成的高温热液系统和受岩浆挥...
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Title 西南太平洋劳盆地东北部火山岛弧热液区羽流中Zn形态分布特征
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