Petrogenesis and tectonic implications of the high-K Alamas calc-alkaline granitoids at the northwestern margin of the Tibetan Plateau: Geochemical and Sr-Nd-Hf-O isotope constraints
SIMS zircon U–Pb dating shows that the Alamas granitoids crystallized at ∼446 Ma.
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The granitic rocks were derived from partial melting of the mafic lower crust, with a component of mantle-derived magma.
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The Alamas pluton was the product of early stage post-collisional magmatism.
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The NKT and the SKT may be amalgamated prior to ca. 446 Ma along the Kudi-Qimanyute suture zone.
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