Volcanic‐plutonic connections in a tilted nested caldera complex in Hong Kong

摘要: [1] Exceptional exposures of four, precisely dated, Middle Jurassic to Early Cretaceous, silicic volcanic centers and their plutonic equivalents in Hong Kong have provided an excellent opportunity examine close connections time space between magma chambers overlying calderas. Here, we describe a ∼14 km crustal section through collapsed caldera southeastern where the intracaldera fill suggests that magmatic discharge was supereruption scale. The main subvolcanic components link chamber with surface are revealed by well-established field relationships, supplemented high precision geochronology, whole-rock geochemistry, geophysical data. Exposures outcrop patterns reveal kilometer-scale subsidence evidence simultaneous evacuation hundreds cubic kilometers high-silica rhyolite dike-like conduits from shallow subcrustal reservoir. resultant volcanotectonic depression, within which is preserved single cooling unit massively columnar-jointed densely welded tuff (High Island tuff), interpreted form part larger tilted Cretaceous nested complex. High eruption signaled end 24 Myr-period voluminous, pulsed magmatism region characterized four discrete ignimbrite ‘flare-ups’.