Episodic volcanic eruption and arid climate during the Triassic-Jurassic transition in the Qiangtang Basin, eastern Tethys: A possible linkage with the end-Triassic biotic crises

•The Late Triassic volcanic event in the Qiangtang Basin was episodic, not continuous.•About four volcanic eruption phases were recorded during the Tr-J transition in the Qiangtang Basin.•A significant paleoenvironment shift occurred during the Tr-J transition in the eastern Tethys.•An extreme arid climate and ocean acidification may lead to the end-Triassic biotic crises.