TY - JOUR

T1 - Simulation of nonisothermal metasomatism of peridotite from mantle wedge beneath the Avacha group of volcanoes (Kamchatka)

AU - Sharapov, V. N.

AU - Kuznetsov, G. V.

AU - Timina, T. Yu

AU - Tomilenko, A. A.

AU - Chudnenko, K. V.

PY - 2017/5/1

Y1 - 2017/5/1

N2 - Comprehensive studies of mineralogy, fluid and melt inclusions, and gas phase in minerals from a representative collection of peridotite xenoliths that underwent metasomatism and convective partial melting in the mantle wedge beneath Avacha Volcano were used to simulate interactions between mantle wedge material and magmatic fluids of constant and variable compositions at different depths, as well as metasomatic effects of fluids derived from subduction slabs. The obtained virtual dynamic patterns of metasomatic zoning across the mantle wedge show how composition variations of fluids and PT conditions at their sources influence the facies of metasomatized mantle wedge harzburgite. The compositions of the Avacha xenoliths and crustal rodingite from Kamchatka compared with results of physicochemical modeling suggest that eruptions of Avacha Volcano brought metasomatized material of the upper mantle wedge to the surface. The rocks underwent multistage metasomatism along cracks in a relatively narrow temperature range. Such processes are apparently common to seismically deformed permeable lithosphere above magma reservoirs. However, the mineralogical zoning of the Kamchatka crustal rhodingites differs from that in cracked metasomatic peridotite above the sources of magmatic fluids in the mantle wedge beneath the Kamchatka arc.

AB - Comprehensive studies of mineralogy, fluid and melt inclusions, and gas phase in minerals from a representative collection of peridotite xenoliths that underwent metasomatism and convective partial melting in the mantle wedge beneath Avacha Volcano were used to simulate interactions between mantle wedge material and magmatic fluids of constant and variable compositions at different depths, as well as metasomatic effects of fluids derived from subduction slabs. The obtained virtual dynamic patterns of metasomatic zoning across the mantle wedge show how composition variations of fluids and PT conditions at their sources influence the facies of metasomatized mantle wedge harzburgite. The compositions of the Avacha xenoliths and crustal rodingite from Kamchatka compared with results of physicochemical modeling suggest that eruptions of Avacha Volcano brought metasomatized material of the upper mantle wedge to the surface. The rocks underwent multistage metasomatism along cracks in a relatively narrow temperature range. Such processes are apparently common to seismically deformed permeable lithosphere above magma reservoirs. However, the mineralogical zoning of the Kamchatka crustal rhodingites differs from that in cracked metasomatic peridotite above the sources of magmatic fluids in the mantle wedge beneath the Kamchatka arc.

KW - dynamics

KW - infiltration metasomatism

KW - mantle wedge

KW - zoning

KW - ORE-MAGMATIC SYSTEMS

KW - THERMODYNAMIC PROPERTIES

KW - HYDROCARBONS

KW - INCLUSIONS

KW - XENOLITHS

KW - PHYSICOCHEMICAL DYNAMICS

KW - SIBERIAN PLATFORM

KW - ARC

KW - EVOLUTION

KW - FLUID

UR - http://www.scopus.com/inward/record.url?scp=85019218997&partnerID=8YFLogxK

U2 - 10.1016/j.rgg.2016.07.003

DO - 10.1016/j.rgg.2016.07.003

M3 - Article

AN - SCOPUS:85019218997

VL - 58

SP - 551

EP - 570

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 5

ER -