Fragments of the Olyutor island arc formed in the Pacific during the Late Cretaceous–Paleogene [1, 8]. At the time they were located far away (about 2000 km) from the Eurasian continental margin [2, 3]; at present, this is a part of the Olyutor–Kamchatka fold region. In the modern structure, Cretace...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.567.1710 http://earth.geology.yale.edu/~brandon/Eprints/Soloviev_etal1998.pdf |
| Summary: | Fragments of the Olyutor island arc formed in the Pacific during the Late Cretaceous–Paleogene [1, 8]. At the time they were located far away (about 2000 km) from the Eurasian continental margin [2, 3]; at present, this is a part of the Olyutor–Kamchatka fold region. In the modern structure, Cretaceous marginal-sea and island-arc rock complexes are thrusted along the Vatyna–Vyvenka–Lesnaya suture zone upon Creta-ceous–Paleogene terrigenous deposits of the Ukelayat trough and Western Kamchatka, which were formed along the continental slope of Eurasia [1, 5, 8–10] (Fig-ure). This work is devoted to the kinematics of the Vatyna–Vyvenka–Lesnaya suture and the timing of collision of the Olyutor island arc with the continental margin. Kinematics of the Vatyna–Vyvenka–Lesnaya suture zone. Investigation of suture zone kinematics is based on studies of mesostructural kinematic indicators such as asymmetric folds, Riedel composite structures, and thrust cutoffs [4, 11]. Structural observations were car-ried out in the Vatyna–Vyvenka suture in the Olyutor zone, namely the Il’Pi and Matysken river district (area I) and the Tapel’vayam River basin (area II) [5], and in the Lesnaya suture (area III) (Fig. 1). Kinematic indicators show that allochthonous nappes composed of marginal-sea and Olyutor arc-related deposits were thrusted in the northeastern direction. The reconstructed direction displays similar orientation in all the areas situated at a significant distance from each other. A different direc-tion of the tectonic movement was registered for the Tapel’vayam River district on the western slope of the Gal’moenan massif) (area II); however, the reliability of this estimate is very low, because it is characterized by a high confidence angle ( |
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