The relationship between systematic metamorphic patterns and collisional processes along the Qinling–Sulu–Odesan collisional belt between the North and South China Cratons
Published:April 17, 2019
Chang Whan Oh, Byung Choon Lee, 2019. "The relationship between systematic metamorphic patterns and collisional processes along the Qinling–Sulu–Odesan collisional belt between the North and South China Cratons", Metamorphic Geology: Microscale to Mountain Belts, Silvio Ferrero, Pierre Lanari, Philippe Goncalves, Eugene G. Grosch
Download citation file:
Along the Qinling–Sulu–Odesan collisional belt, the peak metamorphic conditions reflect systematically changing metamorphic regimes from east to west: ultra-high temperature (UHT) granulite-facies metamorphism in the Odesan area; high pressure (HP) eclogite-facies metamorphism in the Hongseong area; ultra-high pressure (UHP) eclogite-facies metamorphism in the Sulu, Dabie and Hong'an areas; HP eclogite-facies metamorphism in the Tonbai area; epidote–amphibolite- and blueschist facies metamorphism in the Wudang area; and HP granulite-facies metamorphism in the western Qinling area. Additionally, the Triassic post-collisional igneous rocks regionally intruded at both ends of the collision belt, in the west Qinling and Hongseong–Odesan areas. These observations indicate that the following collisional processes occurred along the Qinling–Dabie–Odesan collisional belt. The North China Craton and South China Craton first collided at their eastern margins (the Odesan area) with an angle of approximately 60° between their long axes. Consequently, the amount of oceanic slab subducted before the collision increased from the Odesan area to the Sulu area, resulting in an increase in the depth of slab break-off. After slab break-off occurred in the Sulu area, the lateral tearing force strengthened, decreasing the depth of slab break-off from the Sulu area to the western Qinling area as collision propagated westward.
Figures & Tables
Metamorphic Geology: Microscale to Mountain Belts
CONTAINS OPEN ACCESS
In Earth evolution, mountain belts are the loci of crustal growth, reworking and recycling. These crustal-scale processes are unravelled through microscale investigations of textures and mineral assemblages of metamorphic rocks. Multiple episodes of metamorphism, re-equilibration and deformation, however, generally produce a complex and tightly interwoven pattern of microstructures and assemblages. Over the last two decades, the combination of advanced computing and technological capabilities with new concepts has provided a vast array of novel petrological tools and high-resolution/high-sensitivity techniques for microanalysis and imaging. Such novel approaches are proving fundamental to untangling the enigma represented by metamorphism with an unprecedented level of detail and confidence. As a result, the first decade and a half of this century has already seen the tumultuous development of new research avenues in metamorphic petrology. This book aims to provide a timely overview of the state of the art of this field, of newly developed petrological techniques, future advancements and significant new case studies.