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Nannong Formation

Nannong Fm

Period: 
Mesoproterozoic

Age Interval: 
Xishanian (Ectasian) Xs (40)


Province: 
Zhejiang, Fujian

Type Locality and Naming

SW Zhejiang. The Nannong Fm was named by Hu Xiongjian, Xu Jinkun et al. in 1991, The type section is in Zhukeng, Longquan City, Zhejiang Province. It is the uppermost formation in Longquan Gr.

Synonym: （南弄组）


Lithology and Thickness

The Nannong Fm is composed of a metamorphosed basic volcaniclastic rock and carbonate rock series. The lower part is dominated by garnet-bearing biotite leptite [=obsolete term for a fine-grained banded, gneissic rock; often interpreted as metamorphosed volcanics]; the middle part is epidote amphibolite intercalated with marble; the upper part consists of garnet two-mica quartz schist sandwiched with two-mica leptite. It is recorded as over 750 m in its exposed thickness.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

It is in conformable contact with underlying Qingkeng Fm.

Upper contact

Top of the formation is not seen, owing to direct overlap by effusive volcanic rock of Fenping Fm of Upper Jurassic.

Regional extent

SW Zhejiang – N. Fujian. The formation is distributed in Yinchang, Nannong, and Caokeng in Longquan County, Zhejiang Province.


GeoJSON

null

Fossils


Age 

Amphibolite sampled from the formation was dated by Sm-Nd whole-rock at 1376.5±82.1 Ma and 1389.2±47.2 Ma. Based on these radioisotopic dates, the formation is roughly attributed to Jixian Period of the Mesoproterozoic Erathem. But schematic stratigraphic column shows spanning late Xishanian (late Ectasian).

Age Span: 

    Beginning stage: 
Ectasian

    Fraction up in beginning stage: 
0.65

    Beginning date (Ma): 
1,270.00

    Ending stage: 
Ectasian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1,200.00

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.