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Panei Formation

Panei Fm

Period: 
Paleogene

Age Interval: 
Early to Middle Eocene, (9a)


Province: 
Xizang (Tibet)

Type Locality and Naming

The naming section is located to the north of Nianbo Village ~37 km southwest of Linzhou County, Tibet. Named by the Tibet Regional Survey Party in 1991.


Lithology and Thickness

A suite of acid pyroclastic rocks with lavas, consisting dominantly of rhyolitic tuff with volcanic breccia, rhyolite and dacite. The suite is intercalated with the greywacke and conglomerate association in Lhasa in the east and is almost all composed of acid pyroclastic rocks with lavas in the Ngari area in the west. The formation is thin in the east and thick in the west, ranging in thickness from 1800 to 4500 m.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

It is in unconformable contact with the underlying Eocene Nianpo Fm.

Upper contact

It is in unconformable contact with the overlying Oligocene Rigongla Fm.

Regional extent


GeoJSON

null

Fossils


Age 

The volcanic rocks have K-Ar ages of 44.4±0.8, 42 and 39.5 Ma.Liu and Li (2016) suggested that the Cenozoic sediments in Wuyu Basin should be divided into four units (from bottom to top): the Rigongla Fm (Oligocene), the Mangxiang Fm (late Early Miocene to early Middle Miocene, ~18-15 Ma), the Laiqing Fm (late Middle Miocene to early Late Miocene, ~15-8Ma), and the Wuyu Gr (Late Miocene to Pliocene, ~8-2.5 Ma).

Age Span: 

    Beginning stage: 
Lutetian

    Fraction up in beginning stage: 
0.75

    Beginning date (Ma): 
42.79

    Ending stage: 
Bartonian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
37.71

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Tao Deng, Yuanqing Wang, Qian Li, et al.