Magma chamber-related transition from magmatic to solid-state fabrics within the Late Triassic granitic Dushan pluton (North China)

SUMMARY Penetrative petro-fabrics in plutons, particularly late-stage solid-state fabrics, are usually considered to record regional tectonism. However, these fabrics fundamentally ambiguous correlate with magma-chamber processes or tectonics. Understanding the of fabric formation requires a proper understanding pluton and emplacement mechanism. In this paper, we provide case study transition from magma chamber-related magmatic within Late Triassic granitic Dushan (North China) based on multidisciplinary investigation its mechanism, including structural geology, isotope chronology, AMS data measurement, gravity modeling. The varies southwest direction megascopically isotropic monzogranite northeast an arc-shaped gneissic locally mylonitic zones along margin. compatible outward dipping mesoscopic magnetic susceptibility foliations define dome-like roof NE-SW long axis. Considering absence similar penetrative country rocks, continuum variations pluton, conditions, probably formed during emplacement. Gravity modeling suggests that has trending tongue-like shape positioned root. We propose model which was emplaced through feeder zone, beginning as sill then evolving by inflation via several batches. Later batches inflated rocks form final pluton. Magma deformed former semi-solid magma, forming curved foliation margin Several studies show North China Craton (NCC) experienced crustal extension attending Both could be more related process rather than tectonics, implying such plutons need used caution for inferring