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Mesoproterozoic

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Quxiang Formation

Quxiang Fm

Period: 
Mesoproterozoic

Age Interval: 
Changchengian-Jixianian (Calymmian) Jx (23)


Province: 
Xizang (Tibet)

Type Locality and Naming

South Tibet next to Nepal. The Quxiang Fm was named by MaoYanshi in 1985. The type section is in Youyiqiao-Rouqie Village, Nyalam County, Tibet. Lower formation in Nyalam Gr.

Synonym: （曲乡组）


Lithology and Thickness

Lower part of Nyalam Gr (Quxiang Fm) is dominated by different gneisses of mostly metamorphosed greywacke and mudstone. The Quxiang Fm is subdivided into lower and upper parts. Lower part is composed of kyanite biotite schist, garnet-bearing biotite-quartz schist intercalated with garnet-biotite-plagioclase leptite , two-mica quartz schist. Upper part is garnet-bearing two-mica quartz schist, with quartzite and biotite plagioclase leptite. The thickness varies from 2400 m to over 5970 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Bottom is not seen.

Upper contact

It is in conformable contact with the overlying Jiangdong Fm.

Regional extent

South Tibet next to Nepal. The formation spreads in Nyalam County and Dashiqi of Zhaxian County.


GeoJSON

null

Fossils


Age 

Multiple groups of chronological datings are obtained for the protoliths of the formation (generally from 1100 Ma to 2300 Ma). It is inferred that the principal part of the formation is attributed to Mesoproterozoic Era, but part of isotopic data may reflect the age of older massifs. Schematic stratigraphic section suggests span of late Changchengian through Jixian (late Statherian through Calymmian).

Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
1,640.00

    Ending stage: 
Calymmian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1,400.00

Depositional setting

From mindat.org: classic leptite has been interpreted as tectonized quartzo-feldspathic volcanic rocks


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.