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Rigongla Formation

Rigongla Fm

Period: 
Paleogene

Age Interval: 
Oligocene, (9a)


Province: 
Xizang (Tibet)

Type Locality and Naming

The naming section is located at Mangxiang-Gaza, Wuyu, near Rigongla Mount, ~60 km due east of Namling County, Tibet. Named by Wu Yimen et al. of the Third Geological Survey Party, Tibet, in 1973.


Lithology and Thickness

It consists of alternating beds or non-isopachous alternating beds of purplish red, continental coarse sandstone, fine sandstone, siltstone, pebbly sandstone, conglomerate and acid tuff, occasionally intercalated with minor alkaline lavas.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

A sequence of intermontane basin deposits unconformably overlying volcanic rocks of the Paleogene Linzizong Gr.

Upper contact

A sequence of intermontane basin deposits unconformably underlying coal-bearing clastic rocks of the Neogene Mangxiang Fm.

Regional extent

The formation is distributed in the Wuyu basin and Qingdu basin of Namling and the Lunggar area of Zhongba County, with a thickness of 60–4220 m.


GeoJSON

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Fossils

The contained sporopollen fossils belong to the Pteris-Quercus assemblage.


Age 

The K-Ar age is 31.4 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: 
Priabonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
37.71

    Ending stage: 
Chattian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
23.04

Depositional setting

A sequence of intermontane basin deposits.


Depositional pattern:  


Additional Information


Compiler:  

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