Linking the Palaeoproterozoic Nagssugtoqidian and Rinkian orogens through the Disko Bugt region of West Greenland
James N. Connelly
Kristine Thrane
Adam W. Krawiec
Adam A. Garde
10.6084/m9.figshare.3454316.v1
https://geolsoc.figshare.com/articles/dataset/Linking_the_Palaeoproterozoic_Nagssugtoqidian_and_Rinkian_orogens_through_the_Disko_Bugt_region_of_West_Greenland/3454316
<p>The parallel Trans-Hudson-aged Nagssugtoqidian Orogen and Rinkian Fold Belt of West Greenland have long been considered distinct
orogenic belts separated by a zone of low or no Palaeoproterozoic strain in the intervening Disko Bugt region. New U–Pb geochronology
confirms the continuity of Palaeoproterozoic deformation and metamorphism through this region, thereby directly linking the
Nagssugtoqidian Orogen and Rinkian Fold Belt. Furthermore, two newly identified Archaean blocks in this region are interpreted
to represent the southern and northern extensions of the Rae and North Atlantic cratons, respectively. Their boundary comprises
a 15 km wide belt of distributed, NW-vergent ductile thrusts that deform ultramafic pods and is interpreted to represent the
main collisional suture of a single, variably exhumed, >1100 km wide Nagssugtoqidian–Rinkian orogenic system. We conclude
that Palaeoproterozoic convergence of a northern Archaean craton carried a south-facing passive margin sedimentary sequence
(Karrat Group) towards a south-dipping subduction zone along the North Atlantic Craton. Terminal collision created a high-grade
core centred on the magmatic arc of the central Nagssugtoqidian Orogen and a NW-vergent fold and thrust belt in the Rinkian
Fold Belt.
</p>
2016-06-21 12:02:51
Disko Bugt region
Archaean
deform ultramafic pods
Rinkian
thrust
North Atlantic Craton
West Greenland
North Atlantic cratons
orogenic
Palaeoproterozoic
Nagssugtoqidian Orogen
km
Geology