TY - JOUR

T1 - An integrate model of subduction

T2 - Contributions from geology, experimental petrology, and seismic tomography

AU - Dobretsov, N. L.

AU - Koulakov, I. Yu

AU - Litasov, K. D.

AU - Kukarina, E. V.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - We summarize the available knowledge of subduction gained from geology, petrology, and seismology and consider the advantages and drawbacks of each method. Regional and local seismic tomography reveals complex systems of fluid and melt migration at different depths above subducting slabs. The physicochemical evolution of the magma storage system maintaining active volcanism is modeled with reference to a wealth of geological and geophysical data. Subduction-related processes are discussed by examples of active (Kamchatka and Japan arcs) and ancient (Kokchetav metamorphic complex) subduction zones. Comprehensive geological and geophysical studies in Kamchatka and Japan prove valid the leading role of andesite magma in subduction of oceanic crust and, on the other hand, show that modeling independent migration paths of melts and fluids is problematic. The case study of Kamchatka provides more insights into melting in intermediate magma reservoirs at the depths about 50-80 and 30. km and highlights the significance of shallow magma sources at the pre-eruption stage. The Kokchetav metamorphics, which are exhumed suprasubduction rocks, offer an exceptional opportunity to estimate directly the compositions and ages of subduction-related melts.

AB - We summarize the available knowledge of subduction gained from geology, petrology, and seismology and consider the advantages and drawbacks of each method. Regional and local seismic tomography reveals complex systems of fluid and melt migration at different depths above subducting slabs. The physicochemical evolution of the magma storage system maintaining active volcanism is modeled with reference to a wealth of geological and geophysical data. Subduction-related processes are discussed by examples of active (Kamchatka and Japan arcs) and ancient (Kokchetav metamorphic complex) subduction zones. Comprehensive geological and geophysical studies in Kamchatka and Japan prove valid the leading role of andesite magma in subduction of oceanic crust and, on the other hand, show that modeling independent migration paths of melts and fluids is problematic. The case study of Kamchatka provides more insights into melting in intermediate magma reservoirs at the depths about 50-80 and 30. km and highlights the significance of shallow magma sources at the pre-eruption stage. The Kokchetav metamorphics, which are exhumed suprasubduction rocks, offer an exceptional opportunity to estimate directly the compositions and ages of subduction-related melts.

KW - Dehydration

KW - Kamchatka

KW - Kokchetav

KW - Lava composition

KW - Migration of melts and fluids

KW - Phase change

KW - Seismicity

KW - Subduction

KW - Volcano

UR - http://www.scopus.com/inward/record.url?scp=84925326927&partnerID=8YFLogxK

U2 - 10.1016/j.rgg.2015.01.002

DO - 10.1016/j.rgg.2015.01.002

M3 - Article

AN - SCOPUS:84925326927

VL - 56

SP - 13

EP - 38

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 1-2

ER -