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Qinglongshan Formation

Qinglongshan Fm

Period: 
Mesoproterozoic

Age Interval: 
Jixianian (Calymmian) Jx (37)


Province: 
Yunnan, Sichuan

Type Locality and Naming

Central-north Yunnan (border with southernmost Sichuan). The Qinglongshan Fm was named by Wang Kenan et al. in 1963. The type locality is the Qinglong Mt., Dongchuan, Yunnan Province. The reference section is in Sanfengkou-Yinmin, Dongchuan, Yunnan Province. It is the upper formation of the Dongchuan Gr.

Synonym: （青龙山组）


Lithology and Thickness

The Qinglongshan Fm is dominated by greyish, dark-grey, medium-thick-bedded and massive dolomite, often sandwiched with siliceous sands or lumps, stromatolite-reef dolomite and slate. In Huili, the rock was highly metamorphosed, dominated by marble with schist and phyllite. The thickness varies from 1500 to 2000 m.


Lithology Pattern: 
Dolomite


Relationships and Distribution

Lower contact

It is in conformable contact with underlying Heishan Fm.

Upper contact

Disconformably overlain by the Dayingpan Fm.

Regional extent

Central-north Yunnan (border with southernmost Sichuan). Central-north Yunnan (border with southernmost Sichuan). It distributed from Yinmin, Dongchuan, eastern Yunnan to Huili, Sichuan Province.


GeoJSON

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Fossils

The stromatolites are Conophyton f., Lujiacunia wudingensis, Gymnosolen confragosum, Jacutophyton f., Pseudogymnosolen f.


Age 

The Qinglongshan Fm is dated by Pb-Pb method as 1032 Ma and 1024 Ma. But schematic stratigraphic section assigns as late Jixian (late Calymmian).

Age Span: 

    Beginning stage: 
Calymmian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
1,500.00

    Ending stage: 
Calymmian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1,400.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

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