This age also suggests that some of the granitic clasts incorporated into the Del Raton Formation conglomerates come from the erosion of early Carboniferous igneous rocks related to Chanic magmatism.
To the E and NE of the Precordillera, minor but widespread Devonian to early Carboniferous igneous rocks are present in the Sierras Pampeanas (Fig.
1b) there are no known early Carboniferous igneous rocks at this latitude.
The early Carboniferous [sup.40]Ar/[sup.39]Ar age of sample D1-1 clearly shows that the Baltic dolerite sills do not belong to this magmatic stage.
In terms of composition and age, the intrusions in NE Poland and the sills in the Baltic Sedimentary Basin fit the early Carboniferous magmatic activity in the northern Variscan foreland west of the Teisseyre-Tornquist Zone (TTZ; mainly Great Britain and Ireland).
Furthermore, an interbedded rhyolite has been dated in 326 [+ or -] 3 Ma (U-Pb SHRIMP, Herve et al, 2013), which allows us to assign an early Carboniferous age to the Arroyo del Torreon Formation.
(2012) point out that this unit represents passive margin deposits predating the onset of the Gondwanan accretionary prism on the Chileean coast, during the early Carboniferous and extending to the first stages of accretion in a retro-wedge position (>326 and <374 million years).
This unit, named Guarguaraz Complex, is composed by pre-Carboniferous metasedimentary and metabasic (mafic and ultramafic) rocks (Lopez de Azarevich et al., 2009; Gargiulo et al., 2011) deformed under HP (high pressure) conditions in Middle Devonian times, and later under LP (low pressure) conditions in early Carboniferous (Willner et al, 2011).
These strata could be related to synorogenic deposits of the Chanic orogeny (Heredia et al., 2012), which constitute the Angualasto Group of early Carboniferous age (Limarino y Cesari, 1992) in the rest of the Precordillera.
The Lochaber-Mulgrave area of northern mainland Nova Scotia is underlain by rocks of the Late Devonian- Early Carboniferous
Horton Group, in faulted contact with older Devonian and Silurian rocks to the south and west, and younger Carboniferous rocks to the north and east.
1) consist of Avalonian Neoproterozoic rocks, Silurian to Lower Devonian sedimentary rocks, and widespread latest Devonian to early Carboniferous plutons and their volcanic equivalents.
The Cobequid Highlands include the only thick early Carboniferous basalt succession in Atlantic Canada, overlying several kilometres of latest Devonian rhyolite.