Restoration of the external Scandinavian Caledonides
dc.contributor.author | Rice, AHN | en |
dc.contributor.author | Anderson, MW | en |
dc.date.accessioned | 2016-09-29T08:18:40Z | |
dc.date.issued | 2016-07-13 | en |
dc.identifier.issn | 0016-7568 | en |
dc.identifier.uri | http://hdl.handle.net/10026.1/5496 | |
dc.description.abstract |
Three models are evaluated for restoring basement rocks coring tectonic windows (Window-Basement) in the Scandinavian Caledonides; parautochthonous (Model I) and allochthonous (models II/III), with initial imbrication of the Window-Basement post-dating or pre-dating, respectively, that in the external imbricate zone (Lower Allochthon). In Model I, the Window-Basement comes from the eastern margin of the basin now imbricated into the Lower Allochthon, while in models II/III it comes from the western margin. In Model II, the Window-Basement formed a basement-high between Tonian and Cryogenian sediments imbricated into the Middle and Lower allochthons; in Model III deposition of the Lower Allochthon sediments commenced in Ediacaran times. Balanced cross-sections and branch-line restorations of four transects (Finnmark–Troms, Västerbotten–Nordland, Jämtland–Trøndelag, Telemark–Møre og Romsdal) show similar restored lengths for the models in two transects and longer restorations for models II/III in the other transects. Model I can result in c. 280 km wide gaps in the restored Lower Allochthon, evidence for which is not seen in the sedimentology. The presence of <3 km thick alluvial-fan deposits at the base of the Middle Allochthon indicates proximal, rapidly uplifting basement during Tonian–Cryogenian periods, taken as the origin of the Window-Basement during thrusting in models II/III. Model I requires multiple changes in thrusting-direction and predicts major thrusts or back-thrusts, currently unrecognized, separating parts of the Lower Allochthon; neither are required in models II/III. Metamorphic data are consistent with models II/III. Despite considerable along-strike structural variability in the external Scandinavian Caledonides, models II/III are preferred for the restoration of the Window-Basement. | en |
dc.format.extent | 1136 - 1165 | en |
dc.language.iso | en | en |
dc.subject | Lower Allochthon | en |
dc.subject | basement massif | en |
dc.subject | tectonic window, | en |
dc.subject | structure | en |
dc.subject | balanced cross-section | en |
dc.title | Restoration of the external Scandinavian Caledonides | en |
dc.type | Journal Article | |
plymouth.volume | 153 | en |
plymouth.journal | Geological Magazine | en |
dc.identifier.doi | 10.1017/S0016756816000340 | en |
plymouth.organisational-group | /Plymouth | |
plymouth.organisational-group | /Plymouth/00 All current users | |
plymouth.organisational-group | /Plymouth/00 All current users/Academics | |
plymouth.organisational-group | /Plymouth/00 All current users/Academics/Faculty of Science & Engineering | |
plymouth.organisational-group | /Plymouth/00 All current users/Academics/Faculty of Science & Engineering/School of Geography, Earth and Environmental Sciences | |
plymouth.organisational-group | /Plymouth/Faculty of Science & Engineering | |
plymouth.organisational-group | /Plymouth/Faculty of Science & Engineering/School of Geography, Earth and Environmental Sciences | |
plymouth.declined | 2016-09-29T09:18:40.34+0100 | |
dcterms.dateAccepted | 2016-03-30 | en |
dc.rights.embargodate | 2017-01-13 | en |
rioxxterms.versionofrecord | 10.1017/S0016756816000340 | en |
rioxxterms.licenseref.uri | http://www.rioxx.net/licenses/all-rights-reserved | en |
rioxxterms.licenseref.startdate | 2016-07-13 | en |
rioxxterms.type | Journal Article/Review | en |