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Huayu, the only non-basalt islet in the Penghu Islands, consists mainly of andesite lavas intruded by some intermediate (dacite/granodiorite) and felsic (rhyolite/granite) dikes. The LA-ICPMS U–Pb zircon age determination yields 437±13Ma (n=16, MSWD=6.9) for the andesite lava and 63.3±1.5Ma (n=7; MSWD=2.9) for its potassic altered zone, and 58.7±0.8Ma (n=14; MSWD=2.5) for one rhyolite dike. The old...
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