Browsing University Museum of Bergen by Author "Fossen, Haakon"
Now showing items 1-12 of 12
-
Adamastor – an ocean that never existed?
Konopasek, Jiri; Cavalcante, Carolina; Fossen, Haakon; Janoušek, Vojtěch (Journal article; Peer reviewed, 2020)Existing models of tectonic evolution of the Neoproterozoic orogenic system rimming the shores of the South Atlantic Ocean (the Araçuaí–Ribeira–Congo and Dom Feliciano–Kaoko–Gariep belts) interpret the belts as subduction-related ... -
Brittle basement deformation during the Caledonian Orogeny observed by K-Ar geochronology of illite-bearing fault gouge in west-central Sweden
Almqvist, Bjarne; van der Lelij, Roelant; Högdahl, Karin; Lescoutre, Rodolphe; Schönenberger, Jasmin; Fossen, Haakon; Sjöström, Håkan; Juhlin, Christopher; Luth, Stefan; Grigull, Susanne; Viola, Giulio (Journal article; Peer reviewed, 2023)This study presents K-Ar ages of illite-bearing fault gouges in crystalline basement in central-western Sweden. Samples were taken from two faults that localized brittle deformation marginal to and within mafic dikes that ... -
Comment to “Neoproterozoic magmatic arc systems of the central Ribeira belt, SE-Brazil, in the context of the West-Gondwana pre-collisional history: A review”
Fossen, Haakon; Meira, Vinicius T.; Cavalcante, Carolina; Konopásek, Jiří; Janoušek, Vojtěch (Journal article; Peer reviewed, 2021) -
A critical discussion of the subduction-collision model for the Neoproterozoic Araçuaí-West Congo orogen
Fossen, Haakon; Cavalcante, Carolina; Konopásek, Jiří; Meira, Vinicius T.; Trompette, Roland; Hollanda, Maria Helena B.M.; Paes de Almeida, Renato (Journal article; Peer reviewed, 2020)The Neoproterozoic Araçuaí-West Congo orogen in Brazil and Congo represents a branch of the Brasiliano/Pan-African orogenic system that is considered to terminate northward into a confined cratonic environment defined by ... -
The dilemma of asymmetric porphyroclast systems and sense of shear
Zhang, Qing; Fossen, Haakon (Peer reviewed; Journal article, 2020-01)Asymmetric porphyroclast systems have long been used as independent shear-sense indicators based on their clast-tail asymmetry and/or stair-stepping tail geometry. Over the last two decades, advances in exploring the ... -
Disaggregation bands as an indicator for slow creep activity on blind faults
Brandes, Christian; Tanner, David C.; Fossen, Haakon; Halisch, Matthias; Müller, Katharina (Journal article; Peer reviewed, 2022)Hidden, blind faults have a strong seismic hazard potential. Consequently, there is a great demand for a robust geological indicator of neotectonic activity on such faults. Here, we conduct field measurements of disaggregation ... -
From widespread faulting to localised rifting: Evidence from K-Ar fault gouge dates from the Norwegian North Sea rift shoulder
Fossen, Haakon; Ksienzyk, Anna K.; Rotevatn, Atle; Bauck, Marit Stokke; Wemmer, Klaus (Journal article; Peer reviewed, 2021)Although seismic and stratigraphic well information put tight constraints on rift basin evolution, eroded rift shoulders commonly expose polydeformed prerift basement whose deformation history may be difficult to constrain. ... -
Late Jurassic to Late Cretaceous canyons on the Måløy Slope: Source to sink fingerprints on the northernmost North Sea rift margin, Norway
Bauck, Marit Stokke; Faleide, Jan Inge; Fossen, Haakon (Journal article; Peer reviewed, 2021)The Måløy Slope is a key area for studying the connection between onshore and offshore geology of South Norway. It has functioned as an area of bypass, erosion and deposition between the Norwegian mainland source area and ... -
A Pleistocene origin of the strandflat coastal platform in southwestern Scandinavia
Fossen, Haakon (Journal article; Peer reviewed, 2023)An impressively extensive shore platform, the strandflat, is cut 20–50 km into hard crystalline bedrock along most of the Norwegian coastline. Its age and origin have been debated for more than a century, including a model ... -
Quartz textural analysis from an anastomosing shear zone system: Implications for the tectonic evolution of the Ribeira belt, Brazil
Conte, Thailli; Cavalcante, Carolina; Lagoeiro, Leonardo Evangelista; Fossen, Haakon; Silveira, C.S. (Journal article; Peer reviewed, 2020)Strain localization and influence of grain-size reduction processes were investigated from field and microstructural observations, and from quartz textural analysis using EBSD, in rocks deformed along an anastomosing network ... -
Reviewing the puzzling intracontinental termination of the Araçuaí-West Congo orogenic belt and its implications for orogenic development
Cavalcante, Carolina; Fossen, Haakon; Almeida, Renato Paes de; Hollanda, M.H.B.M.; Egydio-Silva, Marcos (Peer reviewed; Journal article, 2019)Palinspastic reconstructions suggest that the late Proterozoic–Cambrian Brasiliano/Pan-African orogenic belt in southeast Brazil and west Congo terminated northwards into an embayment within the São Francisco-Congo cratonic ... -
TitaniQ temperatures and textural analysis as a record of the deformation history in a major continental shear zone system, Borborema Province, Brazil
Cavalcante, Carolina; de Jesus Costa, Juliana; Lagoeiro, Leonardo; Fossen, Haakon; Lee, Amicia; Archanjo, Carlos; Vizeu, Roberto (Journal article; Peer reviewed, 2022)We combine quartz textural analysis with Titanium-in-quartz (TitaniQ) geothermometry to investigate the late stages of deformation in mylonitic rocks from the Sucuru dike swarm in the Borborema Province. The wide range in ...