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- W3048598944 abstract "New 40 Ar/ 39 Ar thermochronological and deformation temperature analyses in the Scandian ( c. 435–420 Ma) orogenic retrowedge of northern Scotland demonstrate accelerated cooling during late syn- to post-orogenic exhumation of the high-grade orogenic core. Initial cooling rates of 10–30°C myr −1 immediately following peak orogenesis transitioned to rapid rates of 45–90°C myr −1 during final exhumation of the Naver thrust sheet in the orogenic core. The flanking ductile thrust sheets exhibit a similar, albeit less pronounced, acceleration of cooling, with rates increasing by c . 150–300% following peak orogenesis. Closer to the foreland, the Moine thrust sheet did not experience increased cooling rates. Calculated unroofing rates of 3.75 mm a −1 in the high-grade Naver thrust sheet suggest increasing, rapid exhumation in the orogenic core during a presumed collapse phase of orogenesis. This is contrary to the expectation of decreasing erosional efficiency as topography is diminished and is interpreted to suggest that unroofing of the Scottish Caledonides may have been partially enhanced by upper crustal extensional deformation during ductile flow of the infrastructure of the orogenic core. Similar processes have been interpreted in the East Greenland Caledonides, which form the northern extension of the Scandian retrowedge. Supplementary material: 40 Ar/ 39 Ar analytical data for muscovite (Supplementary Data Table 1), 40 Ar/ 39 Ar analytical data for amphibole (Supplementary Data Table 2), and electron microprobe analytical data for amphibole samples (Supplementary Data Table 3) is available at: https://doi.org/10.6084/m9.figshare.c.5087057" @default.
- W3048598944 created "2020-08-18" @default.
- W3048598944 creator A5007738567 @default.
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- W3048598944 date "2020-09-23" @default.
- W3048598944 modified "2023-10-16" @default.
- W3048598944 title "Rapid cooling during late-stage orogenesis and implications for the collapse of the Scandian retrowedge, northern Scotland" @default.
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