40Ar-39Ar ages of scandinavian impact structures: I Mien and Siljan

✍ Scribed by R. J. Bottomley; D. York; R. A. F. Grieve

• Publisher: Springer
• Year: 1978
• Tongue: English
• Weight: 818 KB
• Volume: 68
• Category: Article
• ISSN: 0010-7999
• DOI: 10.1007/bf00375448

✦ Synopsis

4~

ages have been obtained on samples of impact melt from the Lake Mien and Siljan hypervelocity impact structures in Sweden. Two samples of "rhyolite'" from Lake Mien yield a plateau age of 118.7 + 2.3 m.y., which is consistent with earlier conventional K-Ar results. Two melt samples from a dikelet in the central granite of Si|jan have an integrated age of 361.9_+ 1.1 m~y.