Zircon inheritance in an igneous rock suite from the southern Adamello batholith (Italian Alps)

U-Th-Pb and 230Th/238U disequilibrium isotope systematics: Precise accessory mineral chronology and melt evolution tracing in the Alpine Bergell intrusion

“…This, however, can result in substantial underestimation of the saturation temperature, because for the same bulk composition, a residual melt fraction in the presence of plagioclase and hornblende crystals would have (Hansmann and Oberli, 1991). Conversely, overestimation of dissolved Zr due to the occurrence of inherited xenocrysts (e.g., sample z7) would lead to an overestimation of the saturation temperature.…”

Magmatic lobes as "snapshots" of magma chamber growth and evolution in large, composite batholiths: An example from the Tuolumne intrusion, Sierra Nevada, California

“…Continuous northward growth is also suggested by the lithodeme distribution pattern of the John Muir and Mount Whitney intrusive suites (Kistler and Fleck, 1994), and migration of magma loci has been observed in many other batholiths around the world, such as, for example, the San Jose tonalite pluton in Baja California (Johnson et al, 2003), the Mt. Stuart batholith in the Cascades (Matzel et al, 2006a), and the Adamello batholith in Italy (e.g., Hansmann and Oberli, 1991). The controls of such magma pathway migration are unclear, but potential causes may be related to tectonic processes or processes in the magma source.…”

The Northern Giudicarie and the Meran-Mauls fault (Alps, Northern Italy) in the light of new paleomagnetic and geochronological data from boudinaged Eo-/Oligocene tonalites

“…The mafic rocks are mostly concentrated on the boundaries of the batholith (Bianchi et al 1970). Middle Eocene ages are also found in the Corno Alto trondhjemites of the south-eastern Adamello (43 ± 1 Ma U/Pb concordia age on zircon, calculated after Mayer et al 2003), as well as in the Re di Castello unit (*40 Ma U/Pb discordia age on zircon, Hansmann and Oberli 1991).…”

“…Only the largest intrusive body, the Adamello batholith, which intruded over a much longer time span than the other plutons (Del Moro et al 1983;Hansmann and Oberli 1991;Stipp et al 2004), deviates from the simple concept of a synkinematic intrusion along the preferentially E-W trending segments of the PAL. Intrusion of the Adamello batholith starts in the south, spatially and temporally independent of the TL.…”