Abstract:Paleomagnetism played key roles in understanding the onset of India—Eurasia collision. However, the quality of the existing paleomagnetic data varies tremendously, such as due to inclination- shallowing, paleosecular variation and remagnetization issues, etc., yielding controversial India—Eurasia collision time ranging from 65 to 20 Ma. In this paper, we carried out strict reliability assessments on the available Late Cretaceous—Paleogene paleomagnetic data from the Lhasa Block and Tethyan—Himalaya and obtained 10 pieces of reliable paleomagnetic data. The results suggested that: ① the Lhasa Block has been stabilized at ~10°to 16°N during Late Cretaceous and was located at ~21.8+2.5/-2.3°N in the late Eocene—early Oligocene; ②the Tethyan—Himalaya was located at ~34.2+4.4/-5.0°S during the middle Late Cretaceous, similar to that of the India Plate, indicating that the Tethyan—Himalaya might have belonged to the northern part of the India Plate at least during between the Early Cretaceous and middle Late Cretaceous; ③the present late Late Cretaceous—early Oligocene paleomagnetic data can only be regarded as references and are not qualified enough to constrain India—Asia collision before the inclination shallowing, paleosecular variation and remagnetization issues have been fully addressed. It is urgent to carry out further comprehensive magnetic and non- magnetic researches on the disputed rock units to check and validate the above factors and to acquire more reliable paleomagnetic data (especially the late Late Cretaceous—Paleogene) from wider areas around the Lhasa Block and Tethyan—Himalaya (especially the middle and western parts). Additionally, given the huge E—W trending long and narrow shape of the two blocks, slight rotation might cause significant difference in paleolatitudes between the east and west parts, future paleomagnetic analyses should be carried out on both the east and west parts of the region.