Geochemistry of vent fluid particles formed during initial hydrothermal fluid–seawater mixing along the Mid‐Atlantic Ridge
Geochemistry of vent fluid particles formed during initial hydrothermal fluid–seawater mixing along the Mid‐Atlantic Ridge
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沿大西洋中脊初始热液海水混合过程中形成的喷口流体颗粒的地球化学
DOI：
10.1029/2011gc003704
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发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
Petersen S
中科院分区：
文献类型：
--
作者：
Klevenz V;Bach W;Schmidt K;Hentscher M;Koschinsky A;Petersen S
我们提供了从海水稀释度为0-99%的热液流体中过滤出来的黑烟颗粒的地球化学数据。结果表明，在大西洋中脊不同热液地点采集的所有样品中，硫化物矿物(铁、铜和锌硫化物)占主导地位。Logatchev I热液场和5°S热液场颗粒地球化学的显著差异可归因于流体化学的差异。与Logatchev I相比，较低的金属/硫比(Me/H_2S<；1)导致每升流体中沉淀出更多的颗粒，并且在5°S时出现元素硫，而在Logatchev I中，Fe氧化物的出现数量更多。流体稀释度的系统趋势包括在低稀释度时析出大量的硫化铜，并随着稀释度的增加而显著下降。此外，铁(硫化物或氧化物)的沉淀随着海水对喷口流体的稀释而增加。热液-海水混合和传导冷却的地球化学反应路径模拟表明，Logatchev I和5°S的铜硫化物形成主要发生在高温和海水对热液的低稀释条件下。较高的流体稀释度促进了铁的析出，在5°S和Logatchev I处形成的不同数量的矿物受热力学控制。与冷却路径相比，混合路径中的矿物总量和硫化物沉淀量更大。模型和现场观测之间确实存在差异，这可归因于闭合系统建模、动力学影响以及可能是模型未考虑的热液有机成分。
We present geochemical data of black smoker particulates filtered from hydrothermal fluids with seawater‐dilutions ranging from 0–99%. Results indicate the dominance of sulphide minerals (Fe, Cu, and Zn sulphides) in all samples taken at different hydrothermal sites on the Mid‐Atlantic Ridge. Pronounced differences in the geochemistry of the particles between Logatchev I and 5°S hydrothermal fields could be attributed to differences in fluid chemistry. Lower metal/sulphur ratios (Me/H2S < 1) compared to Logatchev I result in a larger amount of particles precipitated per liter fluid and the occurrence of elemental sulphur at 5°S, while at Logatchev I Fe oxides occur in larger amounts. Systematic trends with dilution degree of the fluid include the precipitation of large amounts of Cu sulphides at a low dilution and a pronounced drop with increasing dilution. Moreover, Fe (sulphides or oxides) precipitation increases with dilution of the vent fluid by seawater. Geochemical reaction path modeling of hydrothermal fluid–seawater mixing and conductive cooling indicates that Cu sulphide formation at Logatchev I and 5°S mainly occurs at high temperatures and low dilution of the hydrothermal fluid by seawater. Iron precipitation is enhanced at higher fluid dilution, and the different amounts of minerals forming at 5°S and Logatchev I are thermodynamically controlled. Larger total amounts of minerals and larger amounts of sulphide precipitate during the mixing path when compared to the cooling path. Differences between model and field observations do occur and are attributable to closed system modeling, to kinetic influences and possibly to organic constituents of the hydrothermal fluids not accounted for by the model.
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影响因子：
3.5
作者：
S. Petersen;K. Kuhn;T. Kuhn;N. Augustin;R. Hékinian;L. Franz;C. Borowski
通讯作者：
S. Petersen;K. Kuhn;T. Kuhn;N. Augustin;R. Hékinian;L. Franz;C. Borowski
北纬 8°40′ 至 11°50′ 沿东太平洋海隆的热液羽流：颗粒分布和成分
影响因子：
5.3
作者：
R. Feely;J. Gendron;E. Baker;G. Lebon
通讯作者：
G. Lebon
影响因子：
5.8
作者：
Koschinsky, Andrea;Garbe-Schoenberg, Dieter;Strauss, Harald
通讯作者：
Strauss, Harald
Tag Mound 内的流体混合和硬石膏沉淀
DOI：
--
发表时间：
1997
期刊：
影响因子：
--
作者：
R. Mills;D. Teagle;M. Tivey
通讯作者：
M. Tivey
影响因子：
4.4
作者：
JOHNSON, JW;OELKERS, EH;HELGESON, HC
通讯作者：
HELGESON, HC