Fission track studies on hornblende, biotite and phlogopite from Sweden

• Published in: Bulletin of the Geological Society of Finland
• Main Authors: E. Welin, I. Lundström, G. Åberg
• Format: Article in Journal/Newspaper
• Language: English
• Published: Geological Society of Finland 1972
• Subjects: Geology; QE1-996.5; Malmberget
• Online Access: https://doi.org/10.17741/bgsf/44.1.005; https://doaj.org/article/36fd66072f7f44808ddcffca6194c1d0

Fission track studies and K-Ar dating on three silicate minerals from Sweden have given the following results: Fission track age K—Ar age RM 07249 hornblende, Malmberget, Fragment 1 1255 m.y. 1875 m.y. » 2 450 » RM 620569 biotite, Ingelsbo Fragment 1 305 » 975 » » 2 520 » » 3 355 » » 4 410 » RM 640448-640451 phlogopite,Ainön,Fragment 1 230 » 555 » » 2 240 » It is concluded from this investigation that due to inhomogeneous uranium distribution, recent uranium movement and sensitivity for annealing, the fission track dating technique is suitable only for the study of the last thermal event in areas which have undergone a complex geological evolution.