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Wuyu Gr

Wuyu Gr

Period: 
Neogene

Age Interval: 
Late Miocene (Messinian), N1 , (9a)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located at the Mangxiang-Gazha section (E89°44′, N29°39′), Wuyu town, Namling County, Xizang (Tibet) Autonomous Region (BGMRXTAR, 1997). BGMRXTAR (1993) formally published this formation.


Lithology and Thickness

It is divided into two parts: Lower part is formed by intermediate-felsic volcanic rocks (andesite, rhyolite, volcanic conglomerate, and tuff) containing conglomerates and oil shales. Upper part is characterized by coal-bearing clastic rocks (shale, sandstone, gravel, conglomerate) containing tuffacous sanstones and oil shale. It contains abundant fossil plants and sporopollens. Its thickness is in range of 1000~3545 m.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

The Wuyu Gr unconformably contacts with the underlying Mangxiang Fm.

Upper contact

In the type section, no overlying deposit could be seen.

Regional extent

The formation is mainly distributed to Xainza and Namling area. In Zhongba area, the Wuyu Gr is characterized by tuff, rhyolite, and volcanic debris, while in east Bomi and Baxoi area, this formation is mainly formed by motley volcaniclastic rocks.


GeoJSON

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Fossils

Plants: Carpinus wulongensis, Betula parutilis, Quercus, Rhododendron, Thermopsis. (Li and Guo, 1976) Sporopollens: Piceaepollenites, Cefripites, Tsugaepollenites, Laricoidites, Abiespollenites, Eptiodripites, Chenopodium, Typha, Ranuculaceae, Polygonaeae.


Age 

Spicer et al. (2003) conducted 40Ar-39Ar dating in the volcanogenic sediments in the Wuyu Gr that the age of key plant bed is 15.10±0.49 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: 
Tortonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
11.63

    Ending stage: 
Gelasian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1.80

Depositional setting

It is interpreted as an intermontane basin environment.


Depositional pattern:  

Additional Information


Compiler:  

Tao Deng, Sukuan Hou, J.Z. Qigao, Q. Li, Q.Q. Shi, B.Y. Sun, S.Q. Wang, F.X. Wu