Research output: Contribution to journal › Article › peer-review
Migration of fluids and melts in subduction zones and general aspects of thermophysical modeling in geology. / Dobretsov, N. L.; Simonov, V. A.; Koulakov, I. Yu et al.
In: Russian Geology and Geophysics, Vol. 58, No. 5, 01.05.2017, p. 571-585.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Migration of fluids and melts in subduction zones and general aspects of thermophysical modeling in geology
AU - Dobretsov, N. L.
AU - Simonov, V. A.
AU - Koulakov, I. Yu
AU - Kotlyarov, A. V.
PY - 2017/5/1
Y1 - 2017/5/1
N2 - 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.
AB - 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.
KW - Avacha Volcano
KW - fluid
KW - Kamchatka
KW - magma reservoir
KW - mantle wedge
KW - melt
KW - melt inclusion
KW - peridotite
KW - seismic tomography
KW - subduction zone
KW - KAMCHATKA
KW - FRACTIONATING BASALTIC MAGMA
KW - PERIDOTITE XENOLITHS
KW - MANTLE WEDGE BENEATH
KW - AVACHA VOLCANO
KW - KLYUCHEVSKOY GROUP
KW - ULTRAMAFIC ROCK
KW - ARC
KW - SEISMIC TOMOGRAPHY
KW - METASOMATISM
UR - http://www.scopus.com/inward/record.url?scp=85019257785&partnerID=8YFLogxK
U2 - 10.1016/j.rgg.2016.09.028
DO - 10.1016/j.rgg.2016.09.028
M3 - Article
AN - SCOPUS:85019257785
VL - 58
SP - 571
EP - 585
JO - Russian Geology and Geophysics
JF - Russian Geology and Geophysics
SN - 1068-7971
IS - 5
ER -
ID: 10191972