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Mesoproterozoic

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Huodiya Gr

Huodiya Gr

Period: 
Mesoproterozoic

Age Interval: 
Jixianian-Yuxian (Calymmian-Stenian), Jx – Yx (26)


Province: 
Sichuan, Shaanxi

Type Locality and Naming

Northeast Sichuan-Southwest Shaanxi. The Huodiya Gr was named by Hou Defeng (Hou, T. F.) and Wang Xianyan in 1939. The named section is situated in Mawozi Village, Nanjiang County, Sichuan Province.

Synonym: （火地垭群）


Lithology and Thickness

The Huodiya Gr is composed of metamorphosed clastic rock and carbonate rock in the Lower part (Mawozi Fm), which bears stromatolites. Upper part (Shangliang Fm) consists of metamorphosed volcanic rock, metamorphosed clastic rock, and marble. [For details, please see the descriptions for formations.] The Huodiya Gr is 5000 m thick.


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

The formation contacts unconformably with the underlying Houhe Gr.

Upper contact

The top is unconformably overlain by the Tiechuanshan Fm (late Neoproterozoic)

Regional extent

Northeast Sichuan-Southwest Shaanxi. The group is mainly distributed in Wangcang and Nanjiang counties, Sichuan Province. The Mawozi Fm is exposed also in Nanzheng and other places, Shaanxi Province.


GeoJSON

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Fossils


Age 

An olivine-hornblende pyroxenite intruded into the group is dated at 1065 Ma (K-Ar) and the quartz diorite is dated at 956 Ma (U-Pb). Based on these dates, the group is attributed to the Mesoproterozoic Erathem. Schematic stratigraphic section suggests span of Jixian through Yuxian (Calymmian through Stenian).

Age Span: 

    Beginning stage: 
Calymmian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,600.00

    Ending stage: 
Stenian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1,000.00

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.