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Majiahe Formation

Majiahe Fm

Period: 
Mesoproterozoic

Age Interval: 
Changchengian (Statherian) Ch (20,21)


Province: 
Henan, Shaanxi, Shanxi

Type Locality and Naming

Northeast Shanxi. The Majiahe Fm was named by the Party of Regional Geological Survey, Henan Bureau of Geology in 1965. The type section is in Wujiazhuang-Shandingcun west of Majiahe, Yuanqu County, Shanxi Province. Uppermost formation in Xiong'er Gr.

Synonym: （马家河组） , Upper Andesite Porphyrite Fm, Upper Andesite Porphyrite Member, Upper Xiong'er Gr., Upper Xiong'er Fm, Poqianjie Fm, Xishandi Bed, Longbo Fm and Yanyaozhai Fm. are different names for the same Majiahe Fm.


Lithology and Thickness

The Majiahe Fm consists of andesite, basalt-andesite, augite-andesite, sandwiched with rhyolite, dacite, volcanic clastic rock.sandstone, shale and limestone. It is characterized by numerous thick interbeds of sedimentary rocks, and numerous occurrences of andesite in lower part. It is 1750 m to 3910 m thick.


Lithology Pattern: 
Lava


Relationships and Distribution

Lower contact

It has a conformable contact with Jidanping Fm.

Upper contact

The top part is conformably overlain by the Gaoshanhe Fm in Shannxi Province or by the Ruyang Gr (Bingmagou Fm) in Henan Province.

Regional extent

NE Shaanxi-NW Henan-S. Shanxi. The Majiahe Fm. is developed mainly in Xiong'er, Wangwu, Xiaoshan and Waifang Mountains, Henan, Shaanxi and Shanxi provinces. It is laterally stable in lithological character, but changeable in thickness, for example it is 1953 m thick in Wangwu Mt., 1590-1750 m thick in Xiaoshan Mt., and 3910 m in Xiong'er Mountain. But it is not exposed east of Songxian County.


GeoJSON

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Fossils


Age 

Schematic stratigraphic column shows as early Changchengian (early Statherian); and each of the 4 formations are given quasi-equal spans for the graphic display.

Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
1,740.00

    Ending stage: 
Statherian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
1,760.00

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.