| Инд. авторы: | Dobretsov N.L., Simonov V.A., Koulakov I.Y., Kotlyarov A.V. |
| Заглавие: | Migration of fluids and melts in subduction zones and general aspects of thermophysical modeling in geology |
| Библ. ссылка: | Dobretsov N.L., Simonov V.A., Koulakov I.Y., Kotlyarov A.V. Migration of fluids and melts in subduction zones and general aspects of thermophysical modeling in geology // Russian Geology and Geophysics. - 2017. - Vol.58. - Iss. 5. - P.571-585. - ISSN 1068-7971. - EISSN 1878-030X. |
| Внешние системы: | DOI: 10.1016/j.rgg.2016.09.028; SCOPUS: 2-s2.0-85019257785; WoS: 000402445300003; |
| Реферат: | eng: Modeling of fluid-magmatic systems in a suprasubduction mantle wedge is considered for the case of Kamchatka with reference to data on peridotites from other known subduction and oceanic rock complexes. This modeling has to take account of magma storage in several intermediate reservoirs at different depths, up to six such reservoirs, as in the case of Avacha Volcano. Comparison of available data on melt inclusions in spinels indicates crystallization of the Avacha peridotites in magmatic systems progressively decreasing in temperature (> 1200 °C → 1100 °C → 900 °C) and pressure (from 13.8 to 4.5 kbar) in intermediate reservoirs at depths of 30-40 and 15-20 km. The Avacha harzburgites do not belong to primary oceanic mantle as they lack both signatures of high-temperature plastic flow and effects of mantle melts known for sheared mantle peridotites from ophiolite suites. The VP/VS ratio estimated from jointly analyzed P- and S-wave velocities (vP and vs, respectively), an important indicator for seismic tomographic reconstructions of subduction zones, allows discriminating between regions saturated mainly with liquid (melts) and gas phases beneath volcanoes. Only specially tested tomographic data can provide reliable reference for modeling of mantle wedge processes. © 2017
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| Ключевые слова: | Kamchatka; Avacha Volcano; subduction zone; seismic wave; seismic tomography; seismic migration; peridotite; melt inclusion; mantle structure; magma chamber; hydrothermal fluid; subduction zone; seismic tomography; peridotite; melt inclusion; melt; mantle wedge; magma reservoir; Kamchatka; fluid; Avacha Volcano; Russian Federation; |
| Издано: | 2017 |
| Физ. характеристика: | с.571-585 |