Nature and tectonic implications of Mesozoic magmatic rocks in Zhangguangcai Ling(Mts.),Northeast China
During Late Paleozoic to Early Mesozoic,it was found that the tectonic evolutionary history of the Zhangguangcai Ling(Mts.)in Northeast China can be divided into 3 stages:① Late Permian-Middle Triassic(266-234 Ma),the westward subduction of Heilongjiang Ocean formed Ⅰ-type grantic rocks;② Late Triassic-Early Jurassic(224-194 Ma),the Jiamusi-Khanka Block and the Songliao Block collided after the closure of Hei-longjiang Ocean,forming Ⅰ-type with a few A-type granitic rocks;③ Early-Middle Jurassic(194-163 Ma),A2-type and Ⅰ-type granites were developed under the complex influence of the extensional environment after the colli-sion of the two blocks and the westward subduction of the Paleo-Pacific Ocean.Combined with new evolution on the Heilongjiang Complex and the Nadanhada Terrane,the authors consider that the transition between the Paleo-Asian Ocean and the Paleo-Pacific Ocean in eastern Eurasia occurred in the Late Triassic-Early Jurassic,and the Heilongjiang Ocean was an important hinge linking up the tectonic transition between these two domains.
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