Eocene Granitoids of the Okhotsk Granodiorite Complex (South Sakhalin)


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Аннотация

As a result of U–Pb dating by LA-ICP-MS, the age of zircons from granitoids was determined to be 42.1–44.3 Ma for the rocks of first phase and 42.4–42.7 Ma for rhyolites from dikes of the second phase. On the basis of the geochemical studies of rocks, it was found for the first time that granodiorites of the Okhotsk massif (first phase) refer to A2-type granitoids. The most likely explanation of petrogenesis for A2-type granitoids of the Okhotsk complex is the gradual cessation of subduction as a result of deceleration of the Pacific Plate and the transition of the Ozerskii terrane to transform northward motion along the Merei suture zone with a certain role of syn-shear extension. Thus, the data obtained on the age and geochemistry of the Okhotsk complex granitoids suggest the possible time of geodynamic regime change in this area as about 43 Ma ago.

Авторлар туралы

I. Alexandrov

Far East Geological Institute, Far East Branch,
Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: alexandrov@fegi.ru
Ресей, Vladivostok, 690022

J.-P. Liao

Department of Geosciences, National Taiwan University

Email: alexandrov@fegi.ru
Қытай республикасы, Taipei, 10617

B.-M. Jahn

Department of Geosciences, National Taiwan University

Email: alexandrov@fegi.ru
Қытай республикасы, Taipei, 10617

V. Golozoubov

Far East Geological Institute, Far East Branch,
Russian Academy of Sciences

Email: alexandrov@fegi.ru
Ресей, Vladivostok, 690022

V. Ivin

Far East Geological Institute, Far East Branch,
Russian Academy of Sciences

Email: alexandrov@fegi.ru
Ресей, Vladivostok, 690022

Yu. Stepnova

Far East Geological Institute, Far East Branch,
Russian Academy of Sciences

Email: alexandrov@fegi.ru
Ресей, Vladivostok, 690022

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