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Lengqingre Formation
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Lengqingre Fm base reconstruction

Lengqingre Fm

Period: 
Cretaceous

Age Interval: 
Cretaceous, Cenomanian- early Turonian, (12b) K2lq


Province: 
Xizang (Tibet)

Type Locality and Naming

Himalayan South Belt. The Lengqingre Formation was erected by Wan Xiaoqiao in 1985. The section for the designation is in Lengqingre on the east side of Gamba County, Xizang. The reference section is in Zongshan about 250 m southeast of the Gamba County, Xizang.

[Figure: Type section of Lengqingre Formation in Gamba, Tibet]


Lithology and Thickness

The Lengqingre Formation is dominated by dark grey and black shale with two thin-bedded nodular limestone and thin-bedded limestone. It is 214.55 m thick in the type locality.

[Figure: Cenomanian-Turonian boundary in Type section of Lengqingre Formation in Gamba, Tibet]


Lithology Pattern: 
Continental marl


Relationships and Distribution

Lower contact

Its base shows a conformable contact with yellow gray silty limestone interbedded with siltstone at the top of the underlying Chaqiela Fm.

Upper contact

It underlies conformably under the Gambacunkou Fm (XiawuchupoMember Fm)

Regional extent

The present formation occurs in the Dongshan and Zongshan areas of Gamba and in Gongzha of the Tingri County. It is persistent in lithology. It is 55.40-214.55 m thick in the Gamba-Tingre area.


GeoJSON

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Fossils

In the Gamba area, it yields abundant foraminifera Rotalipora evoluta, R. grenhornensis, R. cushmani, R. recheli, Praeglobotruncana stephani, P. turbinata, Hedbergella planispira, H. porisdownensis, Globogerinelloides eaglefordensis, G. bentonensis, Dorothia sphaeroidalis, D. conicula, D. gangbaensis, Gryoidina excerta, Lenticulina franki, Gyroidinoides primitive, G. infracretacea, Anomalina solis, etc.; ammonites Acanthoceras sp., Calycoceras newboldi, etc.


Age 

The dark shale of the Lengqingre Formation is deposited in the period of Cenomanian- early Turonian. During that time, the Oceanic Anoxic Event (OAE2) occurred. This kind of organic-rich sediments can be correlated worldwide.

Age Span: 

    Beginning stage: 
Cenomanian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
100.50

    Ending stage: 
Turonian

    Fraction up in the ending stage: 
0.1

    Ending date (Ma):  
93.45

Depositional setting

It is of normal neritic deposition. The formation was deposited on outer shelf position under the anoxic condition.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao