MID-CRETACEOUS EPISODIC MAGMATISM AND TIN MINERALIZATION IN KHINGAN-OKHOTSK VOLCANO-PLUTONIC BELT, FAR EAST RUSSIA

Abstract

Age of magmatism and tin mineralization in the Khingan-Okhotsk volcano–plutonic belt, including the Khingan, Badzhal and Komsomolsk tin fields, were reviewed in terms of tectonic history of the continental margin of East Asia. This belt consists mainly of felsic volcanic rocks and granitoids of the reduced type, being free of remarkable geomagnetic anomaly, in contrast with the northern Sikhote-Alin volcano–plutonic belt dominated by oxidized-type rocks and gold mineralization. The northern end of the Khingan-Okhotsk belt near the Sea of Okhotsk, accompanied by positive geomagnetic anomalies, may have been overprinted by magmatism of the Sikhote-Alin belt.