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Kadabeng Formation
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Kadabeng Fm base reconstruction

Kadabeng Fm

Period: 
Permian

Age Interval: 
P2 (59), latest Cisuralian to earliest Guadalupian epochs (latest-Early to earliest-Middle Permian)


Province: 
Yunnan

Type Locality and Naming

The type section is located at Kadabeng 72 km to the southeast of Deqin County Town, Yunnan Province. It was named by the 1st Regional Geological Survey Party of Yunna Province in 1985, and was cited publicly by the Yunnan Bureau of Geology and Mineral Resources (1990).


Lithology and Thickness

Limestone and Volcanics. Composed of light-grey micrite limestone and grey-green basalt, intercalated with sandy slate and marble. Its basal part consisting of light-grey and grey medium- and thick-bedded detrital limestones is different from the light-grey massive silty micrite occurring on the top of the underlying Upper Carboniferous Series. Thickness of 2413 m


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Uncertain contact with the underlying strata. The Lexicon column 59 suggests an unconformity onto Upper Carboniferous silty micrite of Xianggu Fm (not in Carb. Lexicon set).

Upper contact

Conformable(?) contact with the overlying Laluobu Fm. The top part of the formation is marked by the occurrence of yellow-green and grey-green altered basic volcanic rocks at the base of the overlying strata known as the Laluobu Fm.

Regional extent

Distributed in the Jiangda area of Tibet, Daqin-Weixi area of Yunnan Province, with a thickness of 1218-2913 m.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[98.63,28.21],[98.8,28.45],[98.7,28.72],[98.66,29.06],[98.87,29.06],[99.03,28.96],[99.07,28.84],[99.15,28.62],[99.28,28.2],[99.44,27.75],[99.55,27.43],[99.71,27.19],[99.85,27.03],[99.92,26.95],[99.76,26.87],[99.36,26.85],[99.16,26.84],[99.03,26.83],[98.84,27.02],[98.79,27.6],[98.63,28.21]]]]}}

Fossils

Fusulinida represented by Nankinella orbicularia, Misellina sp., etc., whose stratigraphic horizon is corresponding to the Qixia Fm


Age 

Xiangboan Stage of the Yangsingian Epoch = latest Cisuralian to earliest Guadalupian epochs (latest-Early to earliest-Middle Permian)

Age Span: 

    Beginning stage: 
Kungurian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
278.84

    Ending stage: 
Kungurian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
274.37

Depositional setting

It is interpreted as deep-water basic lava and flysch deposits.


Depositional pattern:  


Additional Information


Compiler:  

Shang Qinghua, Fei Shuying

GeoJSON estimate by Runan Yong, Suxiao Li and Wen Li (Chengdu Univ. Tech. students)