Heat Flow as an Indicator of the Dynamics of Deep Processes Occurring in Marginal Seas and Island Arcs of the Northwestern Pacific

  • P. M. Sychev
  • V. V. Soinov
  • O. V. Veselov
Part of the Exploration of the Deep Continental Crust book series (EXPLORATION)

Abstract

High heat flow is characteristic of most back-arc basins and island arc volcanic fronts. Numerical calculations and comparisons with other geophysical and geochemical data show that the excess heat sources are distributed at depths of about 20–40 km, where there are layers characterized by high electrical conductivity and low velocities of seismic waves. A discussion of the available data leads to the conclusion that such layers contain melts of ultrabasic composition, the temperature of which reaches 1500 ± 100° C. Injection of high-temperature melts (magmas) from depths of 350–400 km into the uppermost mantle is suggested as the most realistic mechanism for providing rapid heat transport and thus formation of the zones or layers of melted material. By this scenario of deep processes, rising high-temperature melts create pressure that originates from the difference between their density and the density of the surrounding medium, and, as a result, extension failures are produced. These failure zones, in turn, become channels for rising of melts. At the levels where the density of melts is comparable to the density of the host medium, the melts intrude in mainly lateral directions according to a hydrofracture mechanism and megasills form.

Keywords

Crystallization Migration Convection Petroleum Geochemistry 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • P. M. Sychev
  • V. V. Soinov
  • O. V. Veselov
    • 1
  1. 1.Institute of Marine Geology and GeophysicsFar Eastern Branch of the USSR Academy of SciencesYuzhno-SakhalinskUSSR

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