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Devonian Paleogeography of Northeastern China
After collision of the Siberian plate with the North China plate by the end of Caledonian a Devonian sea flooded northeastern China north of the collision zone. This area is subdivided into three geographic components: Hinggan Ling, Yichun-Yuquan and Mishan-Baoqing. South of the collision zone only scattered Lower and Middle Devonian rocks have been found and the paleogeography is unclear.
Gedinnian transgression occurred only in the Hinggan Ling region. A more extensive Siegenian transgression resulted from rifting along the eastern margin of Hinggan Ling and was accompanied by extrusion of a bimodal volcanic suite including spilites and rhyolites. The Emsian sea was the most widespread. A protracted regression started in early Late Devonian and reached its climax in latest Devonian time.
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