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Mesoproterozoic

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Muzisayi Formation

Muzisayi Fm

Period: 
Mesoproterozoic

Age Interval: 
Jixianian (Calymmian) Jx (9)


Province: 
Xinjiang

Type Locality and Naming

SE Tarim Basin. The Muzisayi Fm was named by Feng Mingdao, Li Tiande et al. in 1981.The type section is in the Muzisayi Village, Ruoqiang County, Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region). The Muzisayi Fm is the lower formation in the Taxidaban Gr.

Synonym: （木孜萨依组）


Lithology and Thickness

The Muzisayi Fm is composed of dark-grey, grey-green carbonate rock and clastic rock, which have diverse microplants. Lower part is phyllite with quartz schist. Middle part consists mainly of quartzite and siltstone, intercalated with calcareous fine-grained sandstone and dolomitic limestone Upper part is limestone and dolomitic limestone. The formation is about 500 - 3600 m thick.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

The base is an unconformable contact onto the underlying the Beiketan Fm of the Baxkorgan Gr.

Upper contact

The top is conformably overlain by the Jinyanshan Fm

Regional extent

SE Tarim Basin. It is distributed at Altun Mts., the juncture zone between Qinghai Province. and Xinjiang Province


GeoJSON

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Fossils

The phyllite has palaeornicroplants Trachysphaeridium. Leiopso phosphaera, Nucello- sphaeridium, Asperatopsophosphaera, Lophosphaeridium, Leiominuscula, Leiofusa, Glottimorpha etc.


Age 

Schematic stratigraphic column assigns it to early Jixianian (early Calymmian).

Age Span: 

    Beginning stage: 
Calymmian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,600.00

    Ending stage: 
Calymmian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
1,500.00

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.