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Hanmushan Gr
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Hanmushan Gr base reconstruction

Hanmushan Gr

Period: 
Neoproterozoic

Age Interval: 
Z (15)


Province: 
Gansu, Inner Mongolia

Type Locality and Naming

Longshou Mts. (border central Gansu to Inner Mongolia). The Hanmushan Gr was named by the No. 1 Party of Regional Geological Survey, Gansu Bureau of Geology in 1968 and formally published on the Regional Stratigraphical Scale of Gansu Province in 1980. The typical section is situated at Hanmushan to Dunzigou (Longshou Mountain) in Yongchang County of Gansu Province.

Synonym: （韩母山群）


Lithology and Thickness

According to lithology and ore content, the Hanmushan Gr was subdivided into two formations. The lower formation, the Shaohuotonggou Fm, consists of pebbly phyllite (pebbly claystone) and brecciola in the base, of greenish gray, dark gray phyllite intercalated with pelitic limestone, meta-sandstone and meta-sandy phosphate rock in its lower part, and dark gray pelitic limestone, limestone and phyllite in its upper part. The upper formation, the Caodaban Fm, is composed of gray, light red limestone intercalated with pelitic banded, edgewise limestone and pseudo-oolitic limestone, with a thickness of 191 to 7805 m. It is a total thickness of 995 to 1079 m.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

The Hanmushan Gr rests disconformably or unconformably on the underlying Dunzigou Gr of the Changcheng- Jixian systems

Upper contact

The top is incomplete. Middle Devonian is indicated on the stratigraphic column.

Regional extent

Longshou Mts. (border central Gansu to Inner Mongolia). The Gr is restricted to Longshou Mountain in Alxa area with a NW strike and distributed in Hanmushan, Caodaban and Dunzigou in Yongchang County, Gansu Province and in Huanghelangdagou, Shaohuotonggou in Alxa Zuoqi of Inner Mongolia.


GeoJSON

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Fossils


Age 

Nanhuan-Sinian (Cryogenian-Ediacaran) span on schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Cryogenian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
720.00

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
538.80

Depositional setting

The Hanmushan Gr was considered to be a glacial deposit and a littoral to shallow-sea facies.


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.