The new precise SHRIMP zircon dates obtained in this study indicate that the Wutaishan-Hengshan greenstone belt formed at 2500 Ma ago, immediately after its formation the Wutaishan-Hengshan greenstones had amalgamated with the older Fuping block. Therefore, there was intense tectonic, volcanic, plutonic, and metamorphic activities just before 2500 Ma, which was thought to be related to the major episode of plate tectonic activity in the area. There was also another obvious tectono-thermal event at about 1800 Ma ago, during that time there was some big scale of thrusts occurred, along the thrusts some deep level of rock units was thrust up then juxtaposed with some high level of rock units. This paper has also stressed some key problems on the famous Tiebao unconformity and the stratigraphic division of the lower part of the Wutai Group, and presenting some new idea on both.
|Number of pages||10|
|Journal||Scientia Geologica Sinica|
|Publication status||Published - 1 Jan 2000|
- Late Archaean-Early Proterozoic
- Plate tectonics
- Single zircon SHRIMP dates
- Wutaishan-Hengshan area