Retro‐Foredeep Basin Evolution in Taiwan: Zircon U‐Pb and Hf Isotope Constraints From the Coastal Range

The evolution of the Taiwan orogen, an active arc–continent collision zone between North Luzon Arc (NLA) and Eurasian continent, is recorded in arc volcanic sedimentary rocks from Taiyuan retro-foredeep basin Coastal Range, eastern Taiwan. volcanism northern NLA experienced a magmatic culmination at 9–7 Ma cessation 5.3–4.3 Ma, based on new U-Pb zircon ages. Young ages (1.74, 1.58, <1.2 Ma) low Hf isotope signatures also indicate that three biotite-bearing lapilli tuff layers deposited are associated with eruptions Lutao volcano southern NLA. terminated progressively ∼5.3 to response southward-propagating followed uplift orogenic wedge by <3 myr. detrital age spectra suggest no significant shift provenance during Plio-Pleistocene period synorogenic sediments Basin were mainly derived Yuli Belt, Miocene accretionary complex orogen. accumulation rate deposits varies 0.53 5.14 km/myr, abrupt increase ∼2 Ma. This higher than previously proposed rates pro-foreland west, suggesting asymmetric rapid