The Early Paleozoic Tectonic Evolution of the West Kunlun Mountains: New Constraint from the North Kiida Pluton

P5; Systematic geochemical studies have been conducted on the North Küda Pluton,Pluton is a potassium-rich (K2O＞5.4wt%) I-type granitic pluton and does not contain any alkaline ferromagnesian mineral. Its relatively high REE, LILE (e. g. Rb, Cs, U and Th) and HFSE (e. g. Nb, Zr) contents make it ver...

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Published in:中国地球化学学报(英文版) 2001, Vol.20 (1), p.12-19
Format: Article
Language:English
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Summary:P5; Systematic geochemical studies have been conducted on the North Küda Pluton,Pluton is a potassium-rich (K2O＞5.4wt%) I-type granitic pluton and does not contain any alkaline ferromagnesian mineral. Its relatively high REE, LILE (e. g. Rb, Cs, U and Th) and HFSE (e. g. Nb, Zr) contents make it very akin to the A-type granites. Its heterogeneous Sr (87Sr/86Sri= 0. 7049～0. 7098) and Nd (εNdT = - 1.05～ - 4.04) isotope compositions preclude the possibility of a pure sedimentary or igneous source. Instead, its geochemical compositions suggest that it may be derived from partial melting of a complex source, which consists of igneous and sedimentary rocks. Its intraplate characteristics, together with coeval mafic dykes,indicate an extensional environment at the end of Caledonian. The recognition of the extensional event does not support a continuous subduction-accretion model for the Paleozoic tectonic evolution of the West Kunlun Mountains. On the contrary, it provides new evidence for the twostage island-arc model.
ISSN:1000-9426