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Zonal Metamorphic Complex in the Tongulack Mountain Ridge, Altai, Russia, and Explanation ofIts Origin with the Help of Thermal modelling

引用

Acta Geologica Sinica(English Edition) 1998年第1期72卷 51-64页

作者： G.G.Lepezin V.V.Reverdatto United Institute of Geology Geophysics and MineralogySiberian Branch of Russion Academy of SciencesAcademician Koptyug prospect3 Novosibirsk 630090Russia

A moderate pressure/high temperature zonal metamorphic complex in the Tongulack Mountain Ridge, Altai, Russia, is described, and the applicability of the models of magmatic intrusion and fluid flow to explanation of its origin discussed. The Precambrian complex was formed at 500–700°C and 3.0–5.5 kbars; it is a linear, 25–30 km wide, thermal anticline with a curved axis showing symmetric metamorphic zoning. The metamorphism was isochemical by its nature, as is corroborated by the chemical compositions of the rocks. Four zones can be recognized within the metamorphic complex: chloritic (on the peripheries), cordieritic, sillimanitic and staurolite-out (in the centre). The zones are separated by successive isograds: cordierite, staurolite-in or sillimanite and staurolite-out. It is argued that the origin of the metamorphic zoning can be explained best by a combined fluid-magmatic model; conductive heat flow from the intrusion predominated considerably over the fluid flux in heat transfer: the fluid flow rate was estimated as about 3 ? 10?9 g/cm2, ? s. The modern position of the axial region of the metamorphic belt is predicted to be lying roughly about 1.5 km above the roof of the intrusive body.

关键词： Tongulack complex Altai Russia moderate pressure/high temperature zonal metamorphism heat transfer modelling

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