Trace metal and sulfur cycling in a hydrothermally active arc volcano: deep-sea drilling of the Brothers volcano, Kermadec arc, New Zealand
Trace metal and sulfur cycling in a hydrothermally active arc volcano: deep-sea drilling of the Brothers volcano, Kermadec arc, New Zealand
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热液活跃弧火山中的痕量金属和硫循环：新西兰克马德克弧兄弟火山的深海钻探
DOI：
10.1007/s00126-022-01135-x
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发表时间：
2022
影响因子：
4.8
通讯作者：
Martin A
中科院分区：
文献类型：
--
作者：
Martin A
兄弟火山位于新西兰北部的Kermadec弧上，拥有两个地球化学性质不同的热液系统。西北破火山口和上锥热液田表现出不同的流体成分，显着影响海水和岩浆挥发物，分别。在这项研究中，我们提出了微量金属化学和硫同位素组成的黄铁矿内热液蚀变火山岩从钻芯中回收的深度高达429米以下的海底收集在国际海洋发现计划的远征376。岩浆挥发物影响的蚀变导致叶蜡石±钠明矾石组合发生在上锥和西北火山口低于189米。在西北部的破火山口，后来的海水热液流体叠加在岩浆挥发性蚀变上，形成富绿泥石蚀变。上锥的黄铁矿为细粒自形，富含Cu、As、Sb、Pb和Pt，平均δ 34 S成分为− 5.5 ± 2.9‰（1σ，n= 32）。相比之下，在较老的西北火山口遗址，与叶蜡石富集蚀变有关的黄铁矿颗粒较粗，呈半形，Co、Se、Te和Bi含量较高，但δ 34 S平均值为-4.8 ± 5.5‰（1σ，n= 26）。在西北火山口和上锥站点的叶蜡石±钠明矾石组合的黄铁矿之间的微量金属含量的差异表明，随着热液系统的年龄，黄铁矿的微量金属富集特征发生变化。相对于所有受岩浆挥发物影响的黄铁矿，富绿泥石蚀变（西北火山口）中的黄铁矿贫Cu、Te和Bi，但具有相似的平均δ 34 S组成，为− 4.6 ± 3.5‰（1σ，n=20）。黄铁矿的微量金属富集特征和平均δ 34 S组成的相似性（不考虑伴生的蚀变矿物组合）表明，在流体叠加过程中，黄铁矿的原始岩浆挥发性微量金属特征和硫同位素组成得以保留。富含绿泥石蚀变的黄铁矿中Cu、Te和Bi的含量较低，证实了海水热液流体在海底金属活化和随后形成热液沉淀物方面的重要性。
Brothers volcano, located on the Kermadec arc north of New Zealand, hosts two geochemically distinct hydrothermal systems. The NW Caldera and Upper Cone hydrothermal fields exhibit distinct fluid compositions that are significantly influenced by seawater and magmatic volatiles, respectively. In this study, we present trace metal chemistry and sulfur isotope compositions of pyrite within hydrothermally altered volcanic rocks recovered from drill cores at depths of up to 429 m below the seafloor collected during the International Ocean Discovery Program’s Expedition 376. Magmatic volatile-influenced alteration resulting in pyrophyllite ± natroalunite assemblages occurs at the Upper Cone and at the NW Caldera below 189 m. At the NW Caldera, a later seawater-derived hydrothermal fluid overprints magmatic volatile alteration forming chlorite-rich alteration. Pyrite at the Upper Cone is fine-grained, euhedral and enriched in Cu, As, Sb, Pb and Pt and has an average δ34S composition of − 5.5 ± 2.9‰ (1σ,n= 32). In contrast, pyrite associated with pyrophyllite-rich alteration at the older NW Caldera site is coarse-grained, subhedral and has higher Co, Se, Te, and Bi contents but a comparable average δ34S value of -4.8 ± 5.5‰ (1σ,n= 26). The difference in trace metal content between pyrite from pyrophyllite ± natroalunite assemblages at the NW Caldera and Upper Cone site indicates a change in the trace metal enrichment signature of pyrite with the age of the hydrothermal system. Pyrite from chlorite-rich alteration (NW Caldera) is depleted in Cu, Te and Bi relative to all magmatic volatile-influenced pyrite but has a similar average δ34S composition of − 4.6 ± 3.5‰ (1σ,n=20). The similarity in trace metal enrichment signature and average δ34S composition of pyrite, regardless of associated alteration mineral assemblage shows that the initial magmatic volatile trace metal signature and sulfur isotope composition of pyrite is preserved during fluid overprinting. The lower content of Cu, Te, and Bi in pyrite from chlorite-rich alteration confirms the importance of seawater-derived hydrothermal fluids in metal mobilization and consequent formation of hydrothermal precipitates at the seafloor.
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热流和近海底磁异常凸显了新西兰南克马德克弧兄弟火山口的热液循环
影响因子：
5.2
作者：
F. Caratori Tontini;M. Tivey;C. D. Ronde;S. Humphris
通讯作者：
S. Humphris
新西兰克马德克弧兄弟海底弧火山内的热液蚀变
影响因子：
5.8
作者：
Martin A
通讯作者：
Martin A
海洋钻探计划会议记录，158 份初步报告
DOI：
--
发表时间：
1996
期刊：
影响因子：
--
作者：
S. Humphris;P. Herzig;D. Miller
通讯作者：
D. Miller
DOI：
--
发表时间：
1996
期刊：
影响因子：
--
作者：
S. Humphris;P. Herzig;D. Miller
通讯作者：
D. Miller
影响因子：
3.9
作者：
Andrew J. Martin;I. McDonald;Gawen R. T. Jenkin;K. McFall;A. Boyce;J. Jamieson;C. MacLeod
通讯作者：
Andrew J. Martin;I. McDonald;Gawen R. T. Jenkin;K. McFall;A. Boyce;J. Jamieson;C. MacLeod