Blar i Bergen Open Research Archive på forfatter "Stubseid, Håvard Hallås"
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Geological evolution and stratigraphic relationships of the ophiolitic terrane in the outer Hardangerfjord area: evidence from geochronology and geochemistry
Stubseid, Håvard Hallås (Master thesis, 2017-10-13)Field relations, geochemistry and U-Pb single zircon ages have provided new information about the rocks of the outer Hardangerfjord area that represent a part of the Upper Ordovician ophiolitic terrane of south-western ... -
A Highly Depleted and Subduction-Modified Mantle Beneath the Slow-Spreading Mohns Ridge
Bjerga, Anders; Stubseid, Håvard Hallås; Pedersen, Leif-Erik Rydland; Beinlich, Andreas Michael; Pedersen, Rolf B. (Journal article; Peer reviewed, 2022)The Mohns Ridge is a very slow-spreading ridge that, together with the Knipovich Ridge, marks the boundary between the North American and Eurasian plates in the Norwegian-Greenland Sea. In this study, we report the major ... -
Radiation damage allows identification of truly inherited zircon
Bjerga, Anders; Stubseid, Håvard Hallås; Pedersen, Leif-Erik Rydland; Pedersen, Rolf B. (Journal article; Peer reviewed, 2022)Many studies have reported U-Pb dates of zircon that are older than the igneous rocks that contain them, and they are therefore thought to be inherited from older rock complexes. Their presence has profound geodynamic ... -
Volcanic evolution of an ultraslow-spreading ridge
Stubseid, Håvard Hallås; Bjerga, Anders; Haflidason, Haflidi; Pedersen, Leif-Erik Rydland; Pedersen, Rolf B. (Journal article; Peer reviewed, 2023)Nearly 30% of ocean crust forms at mid-ocean ridges where the spreading rate is less than 20 mm per year. According to the seafloor spreading paradigm, oceanic crust forms along a narrow axial zone and is transported away ...