2. Forvaði

Forvaði. Photo Ingibjörg Kaldal.Forvaði is just north of Húsavíkurhöfði. Here a low rocky point juts out from the beach. It is composed of highly fractured, reddish basalt which contains vein fillings of zeolites such as scolecite, stilbite and mordenite in addition to quartz. The fractures have a polished, striated surface (slickenside). The basalt formation is tilted by 30° to the northwest. An observer might almost think that the rocks had been through a giant stone grinder and were subsequently cemented together forming a sort of dislocation breccia. Faults striking northwest-southeast are seen to the south of Forvaði. Hot springs well up from them, visible in the beach rock at low tide. The faults enter the Laugardalur valley and run parallel to Mt. Húsavíkurfjall in the south. Vertical displacement is greater than the height of the mountain, but horizontal movement is about 100 km. The rock formations at Forvaði have not only been crushed but also rotated approximately 90° clockwise. Strikes of dikes in the Forvaði formation were originally north-south but are now striking east-west and the dikes are crushed and deformed. This deformation occurred during a 6-7 million year period as the Tjörnes peninsula was dragged to the east along the fault zone.Forvaði