International audienceThe Žulová Composite Pluton located at the north-eastern margin of the Bohemian Massif exposes undeformed coexistingmafic–felsic association typical of post-orogenic magmatism. The bulk of the pluton is made of biotite granite andgranodiorites along with subordinate quartz monzodiorite. New LA-ICP-MS U–Pb zircon dating revealed a synchronousemplacement of the biotite granite (291 ± 5 Ma), granodiorite and quartz monzodiorite (292 ± 4 Ma). The whole-rockgeochemistry and the Sr–Nd isotopic data indicate that a plausible source for the biotite granite and the granodiorite couldhave been a lithologically inhomogeneous pile of Devonian arc-derived, immature metagreywackes interbedded withvolcaniclastics. Melting of this crustal material was probably triggered by the rise of hot basic (quartz monzodioritic)magma which could have been an enriched mantle-derived melt contaminated by the underlying Cadomian basement.The Žulová Composite Pluton is a part of a Late Carboniferous–Early Permian Sudetic Granite Belt, including in additionthree large plutonic complexes distributed along major terrane boundaries: the Krkonoše–Jizera, the Strzegom–Sobótkaand the Strzelin massifs. The genesis of this magmatic belt was likely induced by the rise of hot mantle-derived magmain the crust while their spatially and temporally discrete emplacement at shallow levels was probably related to the(extensional) reactivation of lithospheric discontinuities at terrane boundaries. Former orogenic wedges, resulting fromthe inversion of youthful plate margins, represent a feasible fertile source for such post-orogenic granitoids

Laser ablation multi-collector inductively coupled plasma mass spectrometry (LA MC ICP-MS) and secondary ion mass spectrometry (SIMS) were used to determine the boron isotopic compositions of several natural tourmaline group minerals (elbaite, schorl and dravite). This study reports on the effects of instrument parameters of LA MC ICP-MS and the composition of sample matrix on data accuracy, reproducibility and repeatability. We demonstrate that the tourmaline matrix has a significant effect on the obtained δ¹¹B values and impacts on data accuracy, with a bias of up to ca. 2.5‰ if a non matrix-matched reference material is used to calibrate the measurements. In the case of a matrix-matched calibration, the boron isotopic data obtained by LA MC ICP-MS are comparable to the reference TIMS values, with typical repeatability for δ¹¹B results between 0.2 and 0.5‰ (1s). This is somewhat better compared to the repeatability of 0.8–1.3‰ (1s) for small format single collector SIMS.