The research progress and problem of the Sumdo Paleo-Tethys Ocean, Tibet

The evolution process of the Paleo-Tethys tectonic domain on the Qinghai-Tibet plateau has always been a frontier and hotspot of geological research. In order to better understand the tectonic evolution history of the Paleo-Tethys ocean on the Qinghai-Tibet plateau, based on the previous studies, this paper systematically summarized the latest research progress made in recent years in the 1:50,000 regional geological survey, and preliminarily discussed the material composition and the age of subduction and actinic complex zone in the Tangjia-Sundo area. The results show that relatively complete mélange closely related to the evolution of the Paleo-Tethys ocean and the transition of ocean and land are preserved in the Tangjia-Sumdo area in central Gangdise, Tibet, which is an ideal target area for recovery and inversion of the evolution of the Paleo-Tethys ocean. The geological records of the Sumdo Paleo-Tethys crust and its extinction mainly include the late Paleozoic Tangjia-Sumdo ophiolite mélange belt, middle Permian ocean island fragments, high pressure metamorphic belt, late Triassic-early Jurassic magmatism and late Triassic-early Jurassic molassite formation. On the basis of the above work, the evolution process of the Sumdo Paleo-Tethys is preliminarily discussed. These geological records are of great significance to the recovery and inversion of the Paleo-Tethys tectonic evolution on the Qinghai-Tibet plateau.