Impact of Timanian faults on Arctic Tectonics

Descrizione del progetto

In che modo le faglie timanidi influenzano la tettonica nell’Artico

Il progetto ArcTec, finanziato dall’UE, si concentrerà sulle faglie WNW-ESE recentemente identificate nelle isole Svalbard e nel Mare di Barents settentrionale, combinando set di dati geofisici, lavoro sul campo strutturale e sedimentologico e analisi petrologiche e geocronologiche. Ricercatori provenienti da Canada, Germania e Norvegia studieranno l’estensione verso ovest, la cinematica e i tempi della formazione, nonché la riattivazione-overprinting delle faglie timanidi (vale a dire risalenti a circa 600 milioni di anni fa) avvenute durante eventi tettonici successivi nell’Artico. Queste faglie saranno aggiunte a un modello dettagliato di evoluzione tettonica per le Svalbard, il Mare di Barents nord-occidentale e lo stretto di Fram.

Obiettivo

ArcTec proposes to study (1) the westward extent, kinematics and timing of formation, and (2) reactivation–overprint of Timanian (i.e. ca. 600 million years old) faults during subsequent tectonic events in the Arctic, and to (3) insert these faults into a detailed tectonic evolution model for Svalbard, the northwestern Barents Sea and the Fram Strait. The project involves a collaboration between four researchers at UiO (Dr. Koehl and Dr. Anell), McGill University (Canada; Prof. Halverson), and BGR (Germany; Dr. Klitzke).
Thus far, remnants of Timanian metamorphism and basement were identified in southwestern (Majka et al., 2008) and northwestern Spitsbergen (Dallmeyer et al., 1990), and a regional (Torrelian) unconformity between Proterozoic and (latest Neoproterozoic–) lower Paleozoic metasedimentary rocks in southwestern and northeastern Spitsbergen, Bjørnøya and Nordaustlandet coeval with Timanian metamorphism suggests major tectonic reorganization occurred in the late Neoproterozoic (Horn and Orvin, 1928; Harland et al., 1992).
ArcTec will focus on newly identified WNW–ESE faults and basement heterogeneities in Svalbard and the northern Barents Sea, and combine geophysical (magnetic, gravimetric, bathymetric, seismic) datasets, structural and sedimentological fieldwork, and petrological and geochronological analyses to address the targeted objectives. ArcTec will investigate the impact of WNW–ESE faults on the exhumation–burial history of Svalbard and the northwestern Barents Sea margin, and their relationship with amphibolite facies metamorphism of Timanian age, with the Torrelian unconformity in southwestern and northeastern Spitsbergen and western Nordaustlandet, and with older (e.g. Grenvillian) and younger (e.g. Caledonian and Eurekan) structures and fabrics, such as crosscutting and controlling–controlled relationships (inheritance).