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Luobadui Formation
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Luobadui Fm base reconstruction

Luobadui Fm

Period: 
Permian

Age Interval: 
P (49), middle to late Guadalupian Epoch (mid- to late Middle Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the vicinity of the Luobadui Reservoir of the Linzhou County, Lhasa Region, Tibet. It was named by Li Pu in 1955.


Lithology and Thickness

Limestone. The Majula Member is composed of grey and light-purplish-red massive cherty nodule-bearing limestone, with a thickness of 4692 m. The Luobadui Reservoir Member is composed of dark-grey limestone, intercalated with intermediate-basic volcanic rocks and sandstone, with a thickness of about 180 m.


Lithology Pattern: 
Siliceous limestone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Wululong Fm

Upper contact

Regionally, next higher unit is the Lielonggou Fm (Changhsingian)

Regional extent

Distributed in the areas of Linzhou, Mozugongka and Namuco of the Lhasa Region.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[89.67,29.19],[89.48,29.16],[89.55,29.28],[89.71,29.42],[89.63,29.79],[89.78,30.07],[89.72,30.38],[89.92,30.58],[89.79,31],[89.91,31.22],[89.87,31.66],[89.95,31.98],[90.2,31.99],[90.75,32.01],[91.15,31.94],[91.72,31.82],[92.22,31.77],[92.64,31.81],[93.15,31.9],[93.62,31.93],[94.47,31.86],[94.87,31.76],[95.61,31.45],[95.66,31.24],[95.57,31.08],[95.65,30.84],[95.46,30.7],[95.53,30.46],[95.35,30.16],[95.38,29.95],[95.15,29.78],[94.9,29.6],[94.6,29.37],[94.18,29.12],[93.8,28.97],[93.33,28.96],[92.87,29.02],[92.33,29.14],[91.69,29.25],[91.17,29.3],[90.7,29.34],[90.36,29.27],[89.67,29.19]]]]}}

Fossils

Majula Member yields abundant animal fossils, including Fusulinida represented by Neoschwagerina, Verbeekina, Yangchienia, Dunbarula, Lantschichites, Rugososchwagerina, etc.; Corals such as Iranophyllum, Ipciphyllum, Wentzelellites, Parawentzella, etc.,

Luobadui Reservoir Member yields Fusulinida represented by Yabeina, Neoschwagerina, etc.,


Age 

Majula Member is Kufengian Stage of the Yangsingian Epoch = mid-Guadalupian Epoch (mid-Middle Permian). Luobadui Reservoir Member is Lengwuan Stage of the Yangsingian Epoch = Capitanian Stage (late Guadalupian Epoch; late-Middle Permian)

Age Span: 

    Beginning stage: 
Roadian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
274.37

    Ending stage: 
Capitanian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
259.55

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

GeoJSON estimate by Longgang Ye and Yuyin Li (Chengdu Univ. Tech. students)