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 ... -
Metallogenic model of the Lykling ophiolite-hosted lode Au deposit, Scandinavian Caledonides: Insight from fluid inclusions, mineral chemistry and stable isotope geochemistry
Strmic Palinkas, Sabina; Forsberg, Frida; Pedersen, Rolf B.; Stubseid, Håvard Hallås; McClenaghan, Seán H.; Spangenberg, Jorge E. (Journal article; Peer reviewed, 2024)The Lykling lode Au deposit represents a unique example of gold mineralization in the Upper Allochthone of the Scandinavian Caledonides. The mineralization is hosted by the Early Ordovician Lykling Ophiolite Complex and ... -
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 ... -
Trace Element and Sulfur Isotope Signatures of Volcanogenic Massive Sulfide (VMS) Mineralization: A Case Study from the Sunnhordland Area in SW Norway
Strmic Palinkas, Sabina; Fjellet, Trond; Stubseid, Håvard Hallås; Liu, Xuan; Spangenberg, Jorge E.; Čobić, Andrea; Pedersen, Rolf B. (Journal article; Peer reviewed, 2024-04-07)The Sunnhordland area in SW Norway hosts more than 100 known mineral occurrences, mostly of volcanogenic massive sulfide (VMS) and orogeny Au types. The VMS mineralization is hosted by plutonic, volcanic and sedimentary ... -
Volcanic activity and temporal evolution of ultraslow-spreading ridges
Stubseid, Håvard Hallås (Doctoral thesis, 2024-09-05)Det overordnede målet med denne studien har vært å øke vår forståelse av vulkansk aktivitet langs jordens ultrasakte sprederygger. Avhandlingen består av tre deler som sikter mot å: (I) Forstå den romlige og tidsmessige ... -
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 ...