NEW DATA ON THE TIME OF COLLISION OF ISLAND ARC WITH THE CONTINENT ON KAMCHATKA
M. N. Shapiro, A. V. Solov'ev, E. A. Shcherbinina, I. R. Kravchenko-Berezhnoi, and J. I. Garver
Pages: 841-852
Abstract
It is established that the upper part of the Lesnovsky terrigenous series on Northern Kamchatka, which is the autochthon of the Lesnovsky thrust, contains nanoplankton assemblages pertaining to the Lower Paleogene through the Middle Eocene. According to track dating, the youngest population of zircon particles in the sandstones of this series also belongs to the Lower Paleogene (uppermost Paleocene-Middle Eocene). Since the lower part of the neoautochthon of this thrust dates from the Lutetian Stage, the thrusting, as a result of the collision of the Cretaceous-Paleocene island arc with Northeastern Asia, occurred in the middle Lutetian, about 45 Ma ago.
|
