Caledonian metamorphic patterns in Greenland

A plate tectonic scenario for the Iapetus and Rheic oceans

“…This subduction later culminated in the Scandian collision between Baltica and Laurentia, in which northeast Greenland and northeast Svalbard were marked by west-vergent folding and thrusting, regional metamorphism, and magmatism. The timing of deformation, metamorphism, and magmatism indicates that collision began in the early to midSilurian (~435-430 Ma), but deformation continued, at least locally, beyond 400 Ma (Gee and Teben'kov, 2004;Gilotti et al, 2008;Gasser, 2013). In the latest Silurian to early Middle Devonian, HP metamorphism affected the northeast Greenland eclogite province (NGEP) and Liverpool Land (Gilotti et al, 2008;Augland et al, 2011).…”

“…The timing of deformation, metamorphism, and magmatism indicates that collision began in the early to midSilurian (~435-430 Ma), but deformation continued, at least locally, beyond 400 Ma (Gee and Teben'kov, 2004;Gilotti et al, 2008;Gasser, 2013). In the latest Silurian to early Middle Devonian, HP metamorphism affected the northeast Greenland eclogite province (NGEP) and Liverpool Land (Gilotti et al, 2008;Augland et al, 2011). That metamorphism was undoubtedly related to the Scandian collision, but its current location on what was then the upper plate reflects complexities in the collision process that are still not fully understood.…”

“…That metamorphism was undoubtedly related to the Scandian collision, but its current location on what was then the upper plate reflects complexities in the collision process that are still not fully understood. Still more perplexing is the Late Devonian to early Carboniferous UHP metamorphic event recognized in the NGEP, which is enigmatic both in its location and timing (Gilotti et al, 2008).…”

Partial melting due to breakdown of an epidote‐group mineral during exhumation of ultrahigh‐pressure eclogite: An example from the North‐East Greenland Caledonides

“…The North‐East Greenland Eclogite Province (NEGEP) is located on the northeast margin of Laurentia, which was the overriding plate during the Caledonian collision with Baltica (Gilotti & McClelland, ). The NEGEP (Figure ) covers an area of ~50,000 km 2 from latitude 76° to 80°30′N and constitutes the uppermost thrust sheet in the North‐East Greenland Caledonides (Gilotti, Jones, & Elvevold, ). Vast areas of quartzofeldspathic gneiss with eclogitic blocks and rare metapelite (Gilotti, ) are exposed in the NEGEP.…”

“…Vast areas of quartzofeldspathic gneiss with eclogitic blocks and rare metapelite (Gilotti, ) are exposed in the NEGEP. The eclogitic rocks include eclogites senso stricto , garnet clinopyroxenites, garnet websterites, websterites, and coronitic metagabbros (Gilotti et al., ). Protoliths of the gneisses are Paleoproterozoic granodioritic rocks derived from 2.0 to 1.8 Ga calcalkaline batholiths that were intruded by anorogenic granites at 1.75 Ga (Kalsbeek et al., ).…”