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Kelixi Formation
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Kelixi Fm base reconstruction

Kelixi Fm

Period: 
Neoproterozoic

Age Interval: 
Z (11)


Province: 
Xinjiang

Type Locality and Naming

Tieklik region (SW Tarim Basin). The Kelixi Fm was named by Ma Shipeng et al. in 1980 and was published by Gao Xilian in same year. The typical section is situated in Qiakmaklik and Kelixi valleys in Yecheng of Xinjiang Weiwuerzhu Zizhiqu. Middle formation of the Qiakmakelik Gr.

Synonym: （克里西组）


Lithology and Thickness

According to the data of the Jianghan Institute of Petroleum, the lower part of the Kelixi Fm is composed of conglomerate debris flows and of purple gray and greenish gray thick-bedded turbidity sandstone, changing upward into a dark gray, greenish gray pelitic chert of a deep-shelf facies. It is thickness of more than 347 m.

[Figure: Lithology of the Kelixi Fm]


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

It rests conformably on the underlying Bolong Fm tillite or it unconformably overlaps on the Aqikbaxi Fm of the Sukuluok Gr of Qingbaikouan System if the underlying horizon is absent.

Upper contact

The upper part is disconformably overlain by the tillite of the Yutang Formation.

Regional extent

Tieklik region (SW Tarim Basin). The Kelixi Fm is distributed in Yecheng on the north slope of west Kunlun Mountain to south of Pishan County.


GeoJSON

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Fossils

The shale in the lower part yields microplants dominated by Leiopsophosphaera sp., also including Pseudozonosphaera sp., Stictosphaeridium sp., Leiominuscula sp. and Laminarites sp. etc.


Age 

Late Nanhuan (late Cryogenian), for graphic purposes, assigned as the interglacial within the late Cryogenian.

Age Span: 

    Beginning stage: 
Cryogenian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
652.00

    Ending stage: 
Cryogenian

    Fraction up in the ending stage: 
0.94

    Ending date (Ma):  
640.10

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Extracts from The Neoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng.