Strontium isotope composition of the Bindal Batholith, Central Norwegian Caledonides

• Main Authors: Nordgulen, Øystein, Sundvoll, Bjørn
• Format: Article in Journal/Newspaper
• Language: Norwegian
• Published: 1992
• Subjects: KALEDONSKE FJELLKJEDE; DATERING; ISOTOP; GRANITT; Bindal; Nordland
• Online Access: https://hdl.handle.net/11250/2674116

Forkortet: A strontium isotope study of the Bindal Batholith has been carried out. The data generally do not permit precise and accurate age calculations; however, good estimates for initial Sr ratios are commonly obtained. Low initial ratios (c. 0.704-0.705) with little internal variation are present in granitoids in the southeastern part of the batholith. Rocks with intermediate initial ratios (0.705-0.710) predominate and are present throughout most of the batholith, whereas very high ratios (>0.715) are found in tourmaline granites and anatec- tic granitoids in the west. Considering a subduction related setting for the plutonism, the geographical distribution of Sr initial ratios would be consis- tent with a westward-dipping subduction zone. 35713