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Chagannouer Formation
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Chagannouer Fm base reconstruction

Chagannouer Fm

Period: 
Jurassic

Age Interval: 
Callovian-Oxfordian, (Cret17d, TJ6b)


Province: 
Inner Mongolia

Type Locality and Naming

Erlian Basin. Lower formation in this regional version of the Xinganling Gr.

Synonym: Qagan Nur Fm


Lithology and Thickness

Mainly consists of drab-red to purplish-red tuffs, greyish-green lavas, rhyolites, siltstones and grits (Kosenko et al., 2021)


Lithology Pattern: 
Volcanic ash


Relationships and Distribution

Lower contact

Disconformable on the early Bathonian Qiha Fm (lacustrine claystone; without volcanic ash) [Alantanhei Gr].

Upper contact

Disconformably overlain by the Daotenouer Fm.

Regional extent


GeoJSON

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Fossils

Plant fossils and Arguniella [=Ferganoconcha]


Age 

Guo et al. (2019; Fig. 2; based on Guo et al., 2019) suggest entire Xinganling Gr spans 163 to 153 Ma, based on U-Pb (LA-ICP-MS) dates; which they assign as Oxfordian to early Kimmeridgian. Using GTS2020, the span of this Group would be mid-Callovian through earliest-Kimmeridgian. However, the entire Xinganling Gr is placed into only the Barremian (and perhaps extending downward further into lower Cretaceous) by Kosenko et al. (2021), who did not reference Guo et al.'s study. Therefore, until this conflict is resolved, the age model for the Erlian Basin stratigraphy by Guo et al. (2019) is used here.Arbitary allocating each of the three formations in this Gr to sub-equal durations; therefore:

Age Span: 

    Beginning stage: 
Callovian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
163.41

    Ending stage: 
Oxfordian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
160.18

Depositional setting

Lacustrine with volcanic ash beds


Depositional pattern:  


Additional Information


Compiler:  

Guo, Z.X. et al. (2019, Early Cretaceous tectonostratigraphic evolution of the Erlian Basin, NE China, Marine and Petroleumm Geology, 110: 539-564)

Enhanced with Igor N. Kosenko, Jingeng Sha and Boris N. Shurygin (2021). Upper Mesozoic stratigraphy of Sikhote-Alin (Russian Far East) and northeastern China: Non-marine and marine correlations. Part 1: Upper Jurassic-Hauterivian AND 2. Barremian-Aptian. Cretaceous Research, 124: articles 104811 (https://doi.org/10.1016/j.cretres.2021.104811) AND 104812 (https://doi.org/10.1016/j.cretres.2021.104812)