Computer reconstruction of the physicochemical conditions of sulfide formation for the Krasnov and Ashadze hydrothermal systems (Mid-Atlantic Ridge) |
| |
| Institution: | 1. Instituto D. Luiz, Departamento de Geociências ECT, Universidade de Évora, Colégio Luís António Verney, Rua Romão Ramalho, 59, 7002-554 Évora, Portugal;2. Centro de Geofísica de Évora, Departamento de Geociências ECT, Universidade de Évora, Colégio Luís António Verney, Rua Romão Ramalho, 59, 7002-554 Évora, Portugal;3. Centro de Investigação em Ciência e Engenharia Geológica, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;4. Senckenberg Naturhistorische Sammlungen Dresden, Museum für Mineralogie und Geologie, Königsbrücker Landstr. 159, D-01109 Dresden, Germany;1. Fachbereich Geowissenschaften, Mineralogisch-Petrographisches Institut, Universität Hamburg, 20146 Hamburg, Germany;2. Deutsches GeoForschungsZentrum GFZ, Telegrafenberg, 14473, Potsdam, Germany;3. Institut für Geowissenschaften, Abteilung Geologie, Universität Kiel, Ludewig-Meyn-Strasse 10, 24118 Kiel, Germany;4. Institut für Mineralogie, Universität Münster, Corrensstrasse 24, 48149 Münster, Germany;1. IUCA-Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain;2. Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Polígono Río San Pedro, 11510 Puerto Real, Spain;1. Key Laboratory of Metallogenic Dynamics, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;4. Xinjiang Bureau of Geology and Mineral Resources Exploration and Development, Urumqi 830000, China;5. Guangdong Provincial Key Lab of Geological Processes and Mineral Resource Survey, Sun Yat-sen University, Guangzhou 510275, China |
| |
| Abstract: | Computer-based reconstruction of the physicochemical conditions of formation of the Krasnov (16° N) and Ashadze (13° N) submarine systems in the Mid-Atlantic Ridge (MAR) has been performed using the equilibrium-thermodynamic approach to study samples from these sites. In the first case, a sphalerite-pyrite-barite association was considered, and in the second case, a sphalerite-pyrite association. In the modeling conducted, the composition of the sphalerite solid solution corresponding to the nonideal mixing of ZnS and FeS was used as a correlation parameter with the total composition of the Fe-Zn-Ba-S-H2O-NaCl-HCl hydrothermal system depending on temperature (200-300 °C) and a given pressure of 100 bar. The calculation results predict that at an iron content of 0.17-0.36 wt.% in sphalerite, the minimum formation temperatures of the equilibrium sphalerite-pyrite-barite association should correspond to the interval of 280-300 °C (Krasnov site). As the iron content in sphalerite increases to 4.15-13.28 wt.%, the occurrence of barite in the systems studied becomes impossible and the formation temperatures of the sphalerite-pyrite association become equal to or higher than 300 °C (Ashadze site). |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
