Geological Consequences

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 format...

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Bibliographic Details
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
Description
Summary: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.

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