التفاصيل البيبلوغرافية
| العنوان: |
Hydrothermal Mineral Assemblages at 71° N of the Mid-Atlantic Ridge (First Results). |
| المؤلفون: |
Kravchishina, M. D.1 (AUTHOR) kravchishina@ocean.ru, Lein, A. Yu.1 (AUTHOR) lein@ocean.ru, Boev, A. G.1 (AUTHOR), Prokofiev, V. Yu.2 (AUTHOR), Starodymova, D. P.1 (AUTHOR), Dara, O. M.1 (AUTHOR), Novigatsky, A. N.1 (AUTHOR), Lisitzin, A. P.1 (AUTHOR) |
| المصدر: |
Oceanology (00014370). Nov2019, Vol. 59 Issue 6, p941-959. 19p. |
| مصطلحات موضوعية: |
*HYDROTHERMAL vents, *SULFIDE minerals, *HYDROTHERMAL deposits, *WATER distribution, *FLUID inclusions, *PARTICULATE matter, *STRONTIUM, *MOLYBDENUM |
| مصطلحات جغرافية: |
MID-Atlantic Ridge, AZORES |
| مستخلص: |
The article discusses the preliminary results of plume and bottom sediment studies of the Trollveggen hydrothermal vent field based on data from cruise 68 of the R/V Akademik Mstislav Keldysh. The hydrothermal vent field is located east of the axial zone of the slow-spreading Mohn Ridge near the Jan Mayen hotspot at a depth of about 550 m (71°18′ N, Norwegian–Greenland Basin). The hydrothermal vent field plume was characterized by a weak distribution in the water column; temperature, density, and salinity anomalies; a moderate methane concentration; and a low concentration of suspended particulate matter near the bottom. The enrichment of bottom sediments in barium, strontium, and some sulfide-forming elements (zinc, lead, copper, and molybdenum) was shown. Two mineral assemblages of hydrothermally modified bottom sediments were revealed: pyrite and barite–marcasite. The temperature of hydrothermal fluids was established by thermal and cryometric studies of gas–liquid fluid inclusions in barite (128–260°С); the FeS–ZnS equilibrium diagram of sulfide minerals was also used (130–290°С). Our data were close to direct fluid temperature measurement data [28]. We compared the hydrothermal mineralization of the Trollveggen vent field and earlier studied fields of the Mid-Atlantic Ridge located near the Azores hotspot. As a result, we confirmed the influence of ocean depth and PT conditions on the formation of hydrothermal deposits. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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