The Closure of Paleogene Basins of East-Central Tibet in Response to Tectonic, Sedimentation, Magmatism and Paleoclimate
摘要
In east-central Tibet, many Paleogene elongate basins with medium-mini-type are distributed along the large-scale arc-shaped strike-slip and thrust belt of the Nangqian-Yushu and Batang-Lijiang. Detailed mapping, structural-sedimentologic, biostratigraphic, geochemical, and 40Ar/39Ar chronologic data from five Pleogene basins (Dongba, Shanglaxiu, Nangqian, Gongjue, and Mangkang) in the Nangqian-Yushu and Batang region of east-central Tibet indicate that the strata in basin margin developed a large-scale of tilting to form high-steep dip and extrusing syncline, fold and deformation, filled amaranth clastics interbeded with volcanoclastic rock, carbonite and gypsum in basins, and incised by late magmatite.
