显生宙全球古板块再造及构造演化

基于前人对全球古板块构造演化的研究成果、最新的古地磁数据库和ArcGIS方法,辅以洋壳扩张、俯冲带以及区域构造等研究成果,完成了对显生宙以来全球古板块的再造及构造演化探讨。相比前人研究,本系列图件采用了最新数据,加强了高质量数据在板块再造中的权重,并通过"幔源法"对部分板块的古经度进行了校正,同时细化了对中国3大陆块的研究。全球显生宙以来的构造演化涉及到潘诺提大陆、冈瓦纳大陆、劳俄大陆、泛大陆的聚合和裂解旋回及多个大洋盆地的扩张和闭合。中生代一新生代以来不同构造域的发育与消亡在时空上具有此消彼长的关系,造成洋陆格局的变迁和大陆面积的持续增加。不同板块的聚合过程常伴随长距离漂移、大幅度旋转运动以及聚合后的减速。新、老超大陆之间以翻夹模式裂解和聚合,即随着超大陆内部裂解、扩张,外侧聚敛、旋转,逐渐发生内、外板块边界的转折。泛大陆构造格局具有动态变化的特征,二叠纪规模最大,其形态不完整,有扇状洋盆缺口(古特提斯洋)持续扩张以及板内走滑运动调整。泛大陆聚合过程中至少出现4种板块汇聚碰撞方式:追尾式碰撞、侧向式碰撞、错车武碰撞和拥堵式碰撞。

Discussion on global tectonics evolution from plate reconstruction in Phanerozoic

In this study, we compile Phanerozoic global plate reconstruction maps and discuss relevant tectonic evolution based on previous research findings, the latest paleomagnetic database and ArcGIS method, and research achievements regarding oceanic crustal spreading, subduction belts, and regional tectonics. Compared with the existing global plate reconstruction maps, our constructed maps are superior with the latest paleomagnetic data of high quality and increased weight. Further, we correct the paleo-longtitude of specific plates by using the plume generation zone method and refine the reconstruction of three major blocks of China. Global phanerozoic tectonic evolution involves the convergence and breakup of multiple supercontinents (including Pannotia, Gondwana, Laurussia, and Pangaea) and the spreading and closing of oceanic basins. Since the Mesozoic-Cenozoic period, the development and extinction of tectonic domains had a reciprocal spatiotemporal relationship, leading to the changes in ocean-continent framework and sustainable increases in continental area. The convergence of supercontinents was commonly associated with long-distance drifting, large-scale rotation, and late deceleration. The old and new supercontinents converged and broke up in a flipping model, that is, the inter continent broke up and expanded while the outer one converged and rotated, gradually leading to the transition. The tectonic framework of Pangaea was dynamic, which maximized in the Permian with intact morphology, continuous spreading of fan-shaped gaps, and intraplate adjustment through strike-slip movement. Associated plate collision occurred in at least four patterns, including rear-end collision, lateral collision, rubbing collision, and congestion collision.