Geological Consequences

• Main Author: Shrimp Dating (sredinnyi Range
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1995
• Subjects: Key words; Eocene; zircon; U/Pb SHRIMP; Baraba Formation; Sredinnyi Range; Kamchatka
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.424.8233; http://earth.geology.yale.edu/~brandon/Eprints/Soloviev_etal2004BarabaAges.pdf

Abstract—The Baraba Formation exposed in the Sredinnyi Range (Kamchatka), where it is composed of terrestrial conglomerates, was considered for a long time as the late Campanian–lower Maastrichtian in age based on the fossil flora evidence. Zircons from the tuff layer in the lower part of the formation are dated at 50.5 ± 1.2 Ma using the U/Pb (SHRIMP) method, i.e., the accumulation of their host deposits commenced in the terminal early Eocene. The Baraba Formation overlies unconformably schists and phyllites of the Malka Group, which were metamorphosed during the pre-middle Eocene time, and the Irunei marginal-sea sediments thrust over metamorphic complexes and thus suggesting the pre-middle Eocene thrusting stage.