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Xiahetu Formation
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Xiahetu Fm base reconstruction

Xiahetu Fm

Period: 
Neoproterozoic

Age Interval: 
early-Middle Qingbaikouan (early Tonian)? Qb (62)


Province: 
Zhejiang

Type Locality and Naming

North-central Zhejiang. The Xiahetu Fm was named by Kong Xiangsheng et al. in 1989 and published in 1995. The naming section is in Xiahetu, Chencai Town, Zhuji City, Zhejiang Province. Lower-middle formation of the Chencai Gr.

Synonym: （下河图组）


Lithology and Thickness

In the naming section, the Lower part of the formation is composed of grey, grey-white marble, dolomitic marble and quartzite sandwiched with amphibolite lenses. Middle part consists of grey-black, yellow-brown biotite quartz schist, quartz schist and leucoleptite accompanied with amphibolite. Upper part is greyish milk-white dolomitic marble, marble intercalated with amphibolite. The thickness varies from 360 m to 1400 m.


Lithology Pattern: 
Dolomitic limestone


Relationships and Distribution

Lower contact

It is in conformable contact with the underlying Daojiuwan Fm

Upper contact

It is in conformable contact with the overlying Xiawuzhai Fm

Regional extent

The formation is mainly exposed around Zhuji, Longquan and Qingyuan counties.


GeoJSON

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Fossils


Age 

The overlying Xiawuzhai Fm yields SHRIMP U-Pb dates of 848±5 Ma and 845±5 Ma (Gao Linzhi et al., 2014). early-Middle Qingbaikouan (early Tonian)?

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
916.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
888.00

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.