New Paleomagnetic Results from Accretionary Complexes of the Taigonos Peninsula and Their Paleotectonic Implications

摘要

Paleomagnetic data for various accretionary complexes of the Taigonos Peninsula, including (1) volcanic fragments of the Late Jurassic ensimatic island arc (Povorotnyi Peninsula), (2) fragments of the sedimentary cover of paleoceanic crust dated at the Late Triassic (Povorotnyi Peninsula), and (3) the forearc sedimentary complex (Hauterivian, Yelistratov Peninsula), are analyzed. It is established that (1) Hauterivian elastics in the Yelistratov Peninsula were remagnetized and then deformed, (2) Triassic oceanic cherts were deposited at 2.3 ± 3.2° N, and (3) Late Jurassic island-arc volcanic rocks were formed at 28.6 ± 7.8° N. On the basis of paleomagnetic and geologic data, various hypotheses on the initial location of the island arc and its relationship to the known paleo-Pacific plates are tested.