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Role of the Red River shear zone, Yunnan and Vietnam, in the continental extrusion of SE Asia
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Role of the Red River shear zone, Yunnan and Vietnam, in the continental extrusion of SE Asia
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Journal Article
Role of the Red River shear zone, Yunnan and Vietnam, in the continental extrusion of SE Asia
2006
Overview
The 1000 km long NW-SE-striking, left-lateral Ailao Shan-Red River shear zone runs from the southeastern corner of Tibet to the Gulf of Tonkin and the South China Sea. It has been used as the prime example of a lithospheric-scale strike-slip fault that has accommodated between 500 and 1000 km of southeastwards extrusion of Indo-China away from the Indian plate indentor. Central to the model of continental extrusion is that such faults cut through the entire lithosphere, that shear heating resulted in high-grade metamorphism and local anatexis, and that the ages of sheared granites along the fault also date the timing of strike-slip shearing. However, structural data from the Red River shear zone clearly show that vertical strike-slip faulting post-dated metamorphism and granite emplacement. Most granites along the shear zone are mantle-related granodiorites or within-plate alkali granites formed prior to shearing along the Red River shear zone. Left-lateral kinematic indicators are ubiquitous within the Red River mylonites, but they are always lower-temperature fabrics, formed after peak sillimanite metamorphism and after granite crystallization. It is suggested that left-lateral strike-slip shearing along the Red River shear zone started after 21 Ma, not at 35 Ma as previously thought, and the fault was purely a crustal structure. None of the geological features used to propose the 500-1000 km offsets are robust, and the total finite offset remains unknown.
Publisher
Geological Society of London,The Geological Society of London,Geological Society,Geological Society Publishing House
Subject
/ anatexis
/ Asia
/ Cenozoic
/ China
/ Day Nui Con Voi metamorphic complex
/ Exact sciences and technology
/ fabric
/ Far East
/ faults
/ Geology
/ Granite
/ granites
/ igneous and metamorphic rocks
/ Igneous and metamorphic rocks petrology, volcanic processes, magmas
/ Miocene
/ Neogene
/ Rivers
/ Rocks
/ Tertiary
/ Vietnam
