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The PTst Evolution of Metamorphism and Development Mechanism of the Thermal ‐ Structural ‐ Gneiss Domes in the Chinese Altaides 1
Author(s) -
Yuxun Zhuang
Publication year - 1994
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.1994.mp7003003.x
Subject(s) - metamorphism , gneiss , geology , sillimanite , andalusite , metamorphic rock , migmatite , geochemistry , kyanite , orogeny , petrology , biotite , geomorphology , paleontology , quartz , structural basin
A series of thermal‐structural‐gneiss domes (briefly TSG domes) are developed in the Chinese Altaides. Sericite‐chlorite zone, biotite zone, garnet zone, staurolite zone, kyanite (andalusite) zone, sillimanite ‐ cordierite (sillimanite ‐ garnet) zone, migmatite zone and migmatic granite ‐ gneiss field are developed from the low‐grade metamorphic area to the centre of the TSG domes. The succession of the formation and evolution of the progressive metamorphic zone, migmatite zone and migmatic granite‐gneiss corresponds to the spatial sequence from the outer part to the centre of the TSG domes. The peak temperature of the metamorphism and granitization increases progressively from 400 °C to 800 °C while the pressure decreases progressively from 1.05 GPa to 0.10 GPa from the biotite zone to the migmatic granite‐gneiss field. The metamorphism of the orogenic belt may be described by the pressure‐temperature‐space‐time model (PTst). In the main episode of orogeny, the deep heat flow and structural flow upsurged along a series of the centres of the regional thermodynamic anomalies, giving rise to the progressive metamorphism, granitization, and the differential uplift and the formation of TSG domes.