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Dongxilek Formation

Dongxilek Fm

Period: 
Ordovician

Age Interval: 
Katian, (1)


Province: 
Xinjiang

Type Locality and Naming

The type section is at area northeast of Baihaba (86°50′15″E, 48°43′55″N), measured by the No.6 Team of the Xinjiang Party of Regional Geological Survey in 1980. The Dongxilek Formation was named by Xinjiang Team of Regional Geological Survey in 1978-1979 during the process of 1∶200 000 scale geological survey in Habahe-Halas, and was published by Xiao Bing(1990). The name is derived from Dongxilek Village in Burqin County, Northern Xinjiang.

Synonym: (东锡勒克组), Dongxileke Fm (spelling)


Lithology and Thickness

The Dongxilek Formation consists of grayish purple and grayish green intermediate-acid volcanic rock. In the type section the formation records thickness of 928 m.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

It rests unconformably on the Haba Gr (Cambrian) or on the Habahe Gr (middle Ordovician)

Upper contact

It is conformably overlain by the Baihaba Fm

Regional extent

The Dongxilek Formation is exposed only in Baihaba.


GeoJSON

null

Fossils


Age 

Katian. The strata equivalent to the Dongxilek Formation were taken as Lower-Middle Devonian by No.13 Party of Ministry of Geology and Mineral Resources in 1955-1956. Wang Guangyao et al. (1978) separated it from the Lower-middle Devonian, and gave the name, which was followed by Xiao Bing (1990). Wang Baoyu (1985) assigned this set of strata to the Kanas Group, while Yan Yongkui et al. (1989) believed that this set of strata should be assigned to the Early Silurian. Li Tiande et al. (2001) classified this strata into the Ordovician System. Zhu Yanfei et al. (2018) confirmed its later Ordovician period by Zircon U-Pb age of 445.4±3.1 Ma and 445.7±3.7 Ma from a layered mylonitic dacite.

Age Span: 

    Beginning stage: 
Katian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
449.73

    Ending stage: 
Katian

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
447.47

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Jianpo Wang and Xiaofeng Wang