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Kupukuziman Formation

Kupukuziman Fm

Period: 
Permian

Age Interval: 
P (23), early-Middle Permian


Province: 
Xinjiang

Type Locality and Naming

The type section is located in the southwest of the Yingan Village of the Keping County, Xinjiang. It was named by the Compiling Group for the Regional Stratigraphic Chart of the Xinjiang Uygur Autonomous Region in 1981.


Lithology and Thickness

Clastics and Volcanics. It is divisible into two subformations. Lower subformation is composed of grey-green, grey-purple, purplish red and light-grey siltstone, fine-grained lithoclastic-rich sandstones, intercalated with thin-bedded limestone, with a thickness of 131 m. Its base consisting of variegated clastic rocks. Upper subformation is composed of brown-black olivine-basalt and tuff, with its lower part being intercalated with amygdaloidal basalt, limestone lenses, and with the tuff in its top part being intercalated with grey-green sandstone and clayey siltstone, with a thickness of 123 m. Upper subformation is part of the Tarim Large Igneous Province (LIP).


Lithology Pattern: 
Lava


Relationships and Distribution

Lower contact

Conformable contact with the limestone of the underlying Kangkelin Fm

Upper contact

Conformable contact with the sandstone of the overlying Kaipaizileik Fm

Regional extent

Distributed to the east of the Yingan Mt. in the form of an E-W-trending belt. In the area of the Surbulak Mt. extending from the Yigan Mt. to the Sishichang area of the Shajingzi region the component part of volcaniclastic rocks is increasing remarkably, and the grains of clastics are getting finer than those in the western part. Up to the Sishichang area of the Shajingzi region the formation tends to be intercalated with poor-quality coal seams, and at the same time its thickness tends to be increasing from west to east to reach as great as 258 m.


GeoJSON

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Fossils

Its base yields Plant fossils (phytolites) represented by Lepidodendron sp., Pecopteris sp., Autunia sp. and Cordaites sp.; the base of the Upper subformation yields brachiopods such as Liraplecta aspera, etc., corresponding to the Baliqliq Fm in the eastern segment of Kepingtag (Zhang Zhimin et al., 1991).


Age 

WAS assigned (Permian lexicon version 2017) as mid-Middle Permian. However, 40Ar/39Ar plateau ages obtained from nearby sites are much older: 287.3 ± 2.0 and 287.9 ± 3.1 Ma (Wei et al. 2014) for the basalts of this formation and of the basalts in the overlying Kaipaizileik Fm; which would imply a middle-Early Permian age. But, now is MUCH older –middle Early Permian (ca. mid-Sakmarian to ca. 25% up in Artinskian) ccording to Shuzhong Shen et al. (2019, Permian integrated stratigraphy and timescale of China)!

Age Span: 

    Beginning stage: 
Sakmarian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
292.62

    Ending stage: 
Artinskian

    Fraction up in the ending stage: 
0.25

    Ending date (Ma):  
288.71

Depositional setting

The Lower subformation is interpreted as fluvial to littoral- and lake-swamp-facies deposits. Upper subformation is part of the Tarim Large Igneous Province (LIP).


Depositional pattern:  


Additional Information


Compiler:  

Hou Jingpeng, Zhu Zili