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Luojiamen Formation
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Luojiamen Fm base reconstruction

Luojiamen Fm

Period: 
Neoproterozoic

Age Interval: 
early-Late Qingbaikouan (middle Tonian), Qb (61)


Province: 
Zhejiang

Type Locality and Naming

North Zhejiang. The Luojiamen Fm was named by the Zhejiang Party of Regional Geological Survey in 1975 (Guidebook of 1: 200 000 Scale of Geological Map of Zhuji Sheet). The typical section is situated in Luojiamen village of Fuyang County, Zhejiang Province.

Coordinate: N29°53.407´；E120°02.438´

[Figure: The section the Luojiamen Fm in Fuyang County, Zhejiang Province. a- Sampling of a pebble in the conglomerate of the Luojiamen Fm; b- Sampling locality of a tuff bed in the lower part of the Luojiamen Fm.]

Synonym: （骆家门组）


Lithology and Thickness

Lowermost Luojiamen Fm is composed of greenish gray massive conglomerate. Lower part consists of sandy conglomerate, pebbly medium-to coarse- grained sandstone and banded medium grained sandstone intercalated with acidic volcanic rock. Middle part is flysch rhythmites composed of gray silty mudstone, mudstone and siliceous mudstone. Upper part is flysch rhythmites composed of fine sandstone to siltstone and mudstone. Southward to Pujiang, it is intercalated with volcanic rocks like basic pyroclastic rock, spilite, etc. The total thickness is 1920 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

The Luojiamen Fm rests unconformably on the underlying Shuangxiwu Gr (Zhangcun Fm)

Upper contact

It is disconformably overlain by the greywacke of the Hongchicun Fm

Regional extent

North Zhejiang.


GeoJSON

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Fossils

The siltstone yields microplants Pseudozonosphaeridium sp., Nucellosphaeridium sp., Margominuscula rugosa, Turuchania sp., Granomarginata prima etc.


Age 

SHRIMP U-Pb dates of 832-791 Ma (Gao Linzhi et al., 2014). early-Late Qingbaikouan (middle Tonian) on schematic stratigraphic column.

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: 
0.6

    Ending date (Ma):  
832.00

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.