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Mesoproterozoic

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Quanji Gr

Quanji Gr

Period: 
Mesoproterozoic

Age Interval: 
Changchengian-early Xishanian (Statherian- early Ectasian) Ch-Xs (12a)


Province: 
Qinghai

Type Locality and Naming

North-central Qinghai. The Quanji Gr was named by the No. 632 Team of Petroleum Reconnaissance Survey of Qinghai Bureau of Geology in 1956 and formally published by Wang Yunshan in 1980. The typical section is situated in Quanji Mountain in northern fringe of Qaidam Basin (Daqaidam), Qinghai Province.

Synonym: （全吉群）


Lithology and Thickness

Lower part is composed of conglomerate and pebbly sandstone (Mahuanggou Fm), followed by rhythmic sandstone (Kubaimu Fm), shale, quartzite and basalt (Shiyingliang Fm) and carbonate rock bearing stromatolites and algae (Hongzaoshan Fm). The thickness varies from 778.6 to 2830.2 m. See individual formations for details.

[Figure: The Quanji Group in the Quanji Mts in Qinghai Province (section and field photos by Kuang Hongwei)]


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

The lower part rests unconformably on the Mesoproterozoic Dakendaban Gr (Ch).

Upper contact

The upper part is conformably overlain by the "Lower Cambrian" Heitupo Fm (Xiaogaolu Gr) – which is now considered a mid-Mesoproterozoic (middle Ectasian)

Regional extent

North-central Qinghai. The Quanji Gr is mainly distributed in Olongbluk Mountain, Shihuigou, Quanji Mountain and Datouyang valley in northern fringe of Qaidam Basin, Qinghai Province


GeoJSON

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Fossils


Age 

Schematic stratigraphic column shows it as Changchengian (Statherian), but put here as Changchengian to Xishanian (Statherian to early Ectasian; because it is conformably below Heitupo Fm of middle Ectasian)

Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,800.00

    Ending stage: 
Ectasian

    Fraction up in the ending stage: 
0.3

    Ending date (Ma):  
1,340.00

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.