印支地块晚古生代以来运动历史的古地磁学重建：进展与展望
摘要
<p indent="0mm">To reconstruct the movement history of continental blocks is crucial for understanding the Earth’s system evolution and its dynamic mechanism. The amalgamation of the East Asian blocks is characterized by the closure of the Paleo-Asian Ocean and Tethyan oceans, as a part of the assembly of the Pangea Supercontinent. The Indochina Block is one of the main continental blocks/terranes in East Asia, and it is believed to have rifted and drifted from the northern margin of Gondwana since the Late Paleozoic. Its northward movement and collision with the Eurasia mainland have been paleomagnetically reconstructed over these years. The newly obtained paleomagnetic data from the Indochina Block are thoroughly summarized and analyzed, depicting a step-wisely drifting history of the Indochina Block from the South to the North hemisphere since the Late Paleozoic. It was located at the mid-low latitude area in the South hemisphere during late Carboniferous to middle Permian, which is consistent with the warm-water bio-fossils and fossil-rich limestone; it drifted across the Paleo-equator during the Late Permian and collided with the mainland Eurasia at ca. 30°N by early Late Triassic. The Indochina-mainland Eurasia convergence rate reached a peak at late Permian to early Triassic, indicating an acceleration of the Paleo-Tethys Ocean subduction. This agrees well with the peak age of the subduction-related magmatic rocks that erupted at the Jinshajiang-Ailaoshan suture and Changning-Menglian suture. Interestingly, the well-constrained drifting history of Indochina is coincident with that of the North Qiangtang, suggesting a synchronous northward movement process and indicating a close paleogeographic affinity during at least early Permian to Late Triassic. In contrast, the South Qiangtang and the Sibumasu blocks show markedly different rifting-drifting history. This distinct history is reflected in the Longmu Co-Shuanghu-Changning-Menglian suture belt, which represe