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Qomolangma Gr
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Qomolangma Gr base reconstruction

Qomolangma Gr

Period: 
Neoproterozoic

Age Interval: 
mid-Qingbaikouan through Sinian (mid-Tonian through Ediacaran) Qb-Nh-Z (34)


Province: 
Xizang (Tibet)

Type Locality and Naming

Nyalam, Tibet Himalaya. The Qomolangma Gr was named by Mu Enzhi (1973) after Mount Qomolangma (Mt. Everest). The type section is located in Zhumulangma-Nyalam-Jiala Mountains, Tibet.

Synonym: （珠穆朗玛群）


Lithology and Thickness

The Qomolangma Gr consists of (from bottom to top): (1) Youyiqiao Fm of kyanite, staurolite, biotite schist, two-mica schist, sillimanite biotite schist and biotite quartz schist, interbedded with minor gneiss and diopside marble in the middle part; (2) Dingrenbuqiao Fm of biotite schist, biotite quartz schist and quartz schist with gneiss; (3) Kengshanqiao Fm of garnet quartz schist, biotite quartz schist, biotite and two-mica gneiss, interbedded with diopside marble and phlogopite marble in the middle part and migmatite in the bottom; (4) Jiaquqiao Fm of mainly schist and gneiss. The thickness of the Qomolangma Group is over 17,000 m.


Lithology Pattern: 
Gneiss


Relationships and Distribution

Lower contact

The next older unit is the metavolcanics of the Nyalam Gr (Jiangdong Fm).

Upper contact

Next younger unit is early Paleozoic (no details given).

Regional extent

Zhumulangma-Nyalam-Jiala Mountains, Tibet. Westwards to Ngari area, Neoproterozoic is named as the Namunani Group, which consists mainly of various gneisses and black and white alternations of chert and fine-grained quartzite.


GeoJSON

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Fossils


Age 

Entire mid-Qingbaikouan through Sinian (mid-Tonian through Ediacaran) span given on schematic stratigraphic column – dotted.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
888.00

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
538.80

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.