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Mangxiang Formation

Mangxiang Fm

Period: 
Neogene

Age Interval: 
Early Miocene (Aquitanian), 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 characterized by grey, greyish-yellow, and brown lacustrine sandy shales, oil shales, and laminar coal seams. It contains abundant fossil plants, ostracods, charophytes, and sporopollens. Its thickness is in range of 166~900 m.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

In the type section, the Mangxiang Fm unconformably contacts with the underlying Rigongla Fm.

Upper contact

In the type section, the Mangxiang Fm unconformably contacts with the overlying Wuyu Gr.

Regional extent

The formation is distributed to the area of Namling, Coqen, Zhongba, Gegyai, and the Lunpola Basin.


GeoJSON

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Fossils

Sporopollens: Quercus, Populus latior, Betula parautilis, Carpinus wulongensis.


Age 

According to BGMRXTAR (1993) and Zheng et al. (1999), the tuff layers of the Mangxiang Fm in Gegyai area have isotope dating with 23.1 Ma± 0.3 Ma and 19 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: 
Aquitanian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
23.04

    Ending stage: 
Serravallian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
11.63

Depositional setting

It is interpreted as a series of coal-bearing clastic and volcaniclastic rocks.


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