Diachronous burial and exhumation of a single tectonic unit during collisional orogenesis (Sulitjelma, Arctic Scandinavian Caledonides)

Boyle, A.P.; Burton, Kevin W.; Westhead, R. Keith. 1994 Diachronous burial and exhumation of a single tectonic unit during collisional orogenesis (Sulitjelma, Arctic Scandinavian Caledonides). Geology, 22 (11). 1043-1046. 10.1130/0091-7613(1994)022<1043:DBAEOA>2.3.CO;2

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Abstract/Summary

The Sulitjelma fold nappe represents part of a Caledonian marginal basin obducted during the closure of the Iapetus Ocean and collision between Laurentia and Baltica. Metamorphic pressure-temperature (P-T) paths indicate that various parts of the Sulitjelma fold nappe followed characteristic clockwise P-T paths involving prograde burial followed by prograde exhumation and then near-isothermal exhumation prior to cooling. Geochronological results indicate that foreland rocks followed this general P-T path before more hinterlandward rocks, such that foreland rocks underwent exhumation while hinterlandward rocks were still being buried. This is consistent with the fold nappe passing through a collisional orogen; burial and ultimately prograde metamorphism were terminated sequentially by exhumation as a given part of the fold nappe came into contact with the lower plate, basement ramp (Baltica) and was driven upward. Burial, heating, exhumation, and cooling were thus diachronous within a single tectonic unit.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1130/0091-7613(1994)022<1043:DBAEOA>2.3.CO;2
Programmes:	BGS Programmes > Other
ISSN:	1435-9529
NORA Subject Terms:	Earth Sciences
Related URLs:	Publisher
Date made live:	19 Jan 2010 13:26 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/9079

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