Partition geochemistry of hydrothermal precipitates from submarine hydrothermal fields in the Hellenic Volcanic Island Arc
Partition geochemistry of hydrothermal precipitates from submarine hydrothermal fields in the Hellenic Volcanic Island Arc
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希腊火山岛弧海底热液田热液沉淀物的分区地球化学
DOI：
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发表时间：
2014
影响因子：
0.8
通讯作者：
P. Megalovasilis
中科院分区：
文献类型：
--
作者：
P. Megalovasilis
对沿着火山弧不同浅部热液区（Methana、Milos、科斯和Yali）5个沉积岩芯的地球化学研究表明，不同地区的岩石热液蚀变程度不同，并受热液喷出流体的物理和地球化学性质以及基底岩石类型的影响。爱琴海中部的海底热液场与希腊火山弧相连，并在当地海洋沉积物中留下了热液影响的印记。热液喷口流体在pH值、温度、气体和金属元素含量、气体和水通量强度方面各不相同，而岩石基底在海洋沉积物和矿床的厚度和化学性质方面也各不相同。分析结果表明，Fe的最低值是在Palaeochori湾（0.72%），最高值是在Bros Thermi（2.72%）。锰浓度最高的是Bros Thermi（407 ppm），最低的是Yali（29 ppm）。Cu和Pb浓度最高的是Bros Thermi（21 ppm）和Thibalan Bay（16 ppm），最低的是Yali（1 ppm）。锌的最高值出现在Bros Thermi（56 ppm），最低值出现在Keburs Bay（10 ppm）。最后，观察到的Ca和Mg最丰富的层分别为7.5%和0.98%，最低的层为米洛斯（0.01%的Ca）和鸭梨（0.12%的Mg）。热液活动随地质年代的变化而变化，热液喷口喷出的悬浮颗粒物也对沉积物地球化学产生影响。以甲烷为例，SPM中高浓度的Cu和Zn导致沉积物中高水平的Cu和Zn。
The geochemical study of 5 sediment cores obtained from different shallow hydrothermal fields along the volcanic arc (Methana, Milos, Kos and Yali), revealed that the degree of rock hydrothermal alteration from one area to another is different and is influenced by the physical and geochemical properties of the hydrothermal venting fluids and the type of the rocks in the substrate. The submarine hydrothermal fields in the central Aegean Sea are linked with the Hellenic Volcanic Arc and imprint their hydrothermal influence on the local marine sediments. Hydrothermal venting fluids differ in pH, temperature, gas and metallic element content, intensity of gas and water flux, while rock substrate is variable in terms of thickness and chemistry of the marine sediments and the mineral deposits. The analytical results showed that the lowest values of Fe are observed in Palaeochori Bay (0.72%) and the highest values are found in Bros Thermi (2.72%). The highest Mn concentrations are found in Bros Thermi (407 ppm) and the lowest are found in Yali (29 ppm). Cu and Pb highest concentrations are found in Bros Thermi (21 ppm) and Thiafi Bay (16 ppm), and the lowest in Yali (1 ppm). Zn highest values are found in Bros Thermi (56 ppm) and the lowest values in Kephalos Bay (10 ppm). Finally, the Ca and Mg-richest layers are observed in Kephalos 7.5 and 0.98% respectively and the lowest are observed in Milos (0.01% for Ca) and Yali (0.12% for Mg). The hydrothermal activity presented variations with geological time and hydrothermal suspended particulate matter coming out from the vent outlets also influence the sediment geochemistry. As an example in Methana, high concentrations of Cu and Zn in SPM result in high levels of Cu and Zn in the sediments.
影响因子：
5
作者：
S. Poulton;D. Canfield
通讯作者：
S. Poulton;D. Canfield