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Danzhou Gr

Danzhou Gr

Period: 
Neoproterozoic

Age Interval: 
Late Qingbaikouan (late Tonian), Qb （57）


Province: 
Guangxi

Type Locality and Naming

Northernmost Guangxi. The name Danzhou Gr derived from the Danzhou Schist named by Zhao Jinke and Wu Yansheng in 1941, which was renamed as the Danzhou Group. The typical section is located in Danzhou, Sanjiang County, Guangxi Zhuangzhu Zizhiqu (Guangxi Zhuang Autonomous Region).

Synonym: （丹州群）


Lithology and Thickness

The Danzhou Gr consists of three formations, which is the Baizhu Fm (白竹组), Hetong Fm (合桐组) and Gongdong Fm (拱洞组) from bottom to top. [See individual formations for details.] It is mainly composed of metamorphic sandy mudstone intercalated with minor carbonate rock. It is also intercalated with spilite, pyroclastic rock and a lot of lenticular or basic to ultrabasic rock in Sanmen area of Longsheng County. The total thickness varies from 968 to 4780 m. See the individual formations for more details.

[Figure: The Danzhou Group of the Qingbaikouan System in Guangxi Province]


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

The Danzhou Gr rests unconformably on the underlying Sipu Gr (Sibap Gr) (Yuxi Fm)

Upper contact

Underlies unconformably the overlying Chang’an Fm (glacial)

Regional extent

Northernmost Guangxi. The Danzhou Gr is dominantly distributed in Jiuwan Mt. to Yuecheng Mt. area in the north of Guangxi.


GeoJSON

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Fossils


Age 

SHRIMP U-Pb date of 801±3 Ma in the Hetong Formation (middle formation of the Danzhou Gr) (Gao Linzhi et al., 2010) and SHRIMP U-Pb dates of 799.8±4.7 Ma in lower part and 787±6 Ma in the top of the Gongdong Formation (upper formation of the Danzhou Gr) (Gao Linzhi et al., 2013). Late Qingbaikouan (late Tonian).

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
888.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
776.00

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.