The Götemar granite — isotopic and geochemical evidence for a complex history of an anorogenic granite

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Abstract
The Götemar massif, located in south-eastern Sweden, consists mainly of a coarse-grained homogeneous alkali feldspar granite with subordinate fine-grained varieties. A multi-radiometric dating approach gives a variety of discordant data depending on method and material. The coarse-grained Götemar granite is believed to have intruded and crystallized between 1400 and 1350 Ma ago. The isotopic data, together with Ti, Zr, Y and Nb ratios, strongly resemble those of the Jungfrun granite which represents another anorogenic intrusion in the area. This suggests a common origin for these two granites. Rb-Sr dating of the fine-grained aplitic varieties of the Götemar granite gives an age of 1255 Ma. It is not clear whether these represent late differentiates, or if their age is lowered by late-stage hydrothermal activity.

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