From subduction to collision in the northern Tibetan plateau : evidence from the early Silurian clastic rocks, northwestern China
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The Qilian Orogen records early Paleozoic collisional suturing of the Qaidam Block and the Central Qilian Block to the North China Craton. The composition and U-Pb age of detrital zircons and the composition of Cr-spinels from the Early Silurian Lujiaogou and Angzanggou formations in the northern part of orogen indicate derivation from evolving oceanic and continental source terranes. Heavy-mineral chemistry indicates the incorporation of suprasubduction zone-type ophiolitic detritus in addition to continent-derived material. Integrating these chemical and age data with regional data on the duration of subduction-related magmatic activity, syn- and postcollisional granitic rocks, and high-pressure metamorphic rocks constrains the transformation from oceanic subduction to continental collision to 450-440 Ma. The collision resulted in a flood of detritus into the northern part of the orogen from the Central Qilian Block, which masked input from the intervening magmatic arc, implying rapid exposure of the block.
Yang , J , Du , Y , Cawood , P A & Xu , Y 2012 , ' From subduction to collision in the northern Tibetan plateau : evidence from the early Silurian clastic rocks, northwestern China ' The Journal of Geology , vol. 120 , no. 1 , pp. 49-67 . DOI: 10.1086/662717
The Journal of Geology
© 2012 The University of Chicago Press. Deposited by permission of the publisher.
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