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Tamulangou Formation

Tamulangou Fm

Period: 
Jurassic

Age Interval: 
Late Jurassic, J3 (TJ7, TJ8).


Province: 
Inner Mongolia, Heilongjiang

Type Locality and Naming

It was named by the No. 2 Regional Survey Party under the Geological Bureau of Heilongjiang Province in 1981. The naming section is located at Tamulan Gully southwest of Zuo’er Town, Yakeshi City, Hulunber League, Inner Mongolia. Lowermost formation in Xing'anlin Gr.

Synonym: （塔木兰沟组）


Lithology and Thickness

Tamulangou Fm. is composed largely of grey-green amygdaloidal oligoclase basalt, dense massive oligoclase basalt and their breccias, as well as oligoclase trachyandesite, intercalated with thin layers of grey-black silty mudstone, with a thickness of over 609 m.


Lithology Pattern: 
Lava


Relationships and Distribution

Lower contact

It overlies disconformably the Nanping Fm. However, in Heilongjiang, it is underlain by the Kaikukang Fm (uppermost Emurhe Gr)

Upper contact

It is overlain conformably by the Jixiangfeng Fm

Regional extent

The formation is distributed essentially at the major peak of the Greater Khingan Mts, as well as within the territory of the Hulunber League west of the former and in the area of the Mountain Road Maintenance Squad of the Highway of Heihe City, Heilongjiang Province; in the area of Xifeng Mts; in the area north of the No. 23 Station of a highway maintenance squad and east of the Nenmuo Highway, and in the area north of the No. 21 Station of a highway maintenance squad and of Waluli.


GeoJSON

null

Fossils


Age 

Its whole-rock K-Ar age is of 152-158 Ma, K-Ar isochron age is of 144.5 Ma, and Rb-Sr whole-rock isochron age is of 145.1 Ma (Bureau of Geology and Mineral Resources of the Inner Mongolian Autonomous Region, 1991).So the age of the formation should be assigned to the Late Jurassic Epoch. Schematic stratigraphic column suggests a late-Oxfordian age.

Age Span: 

    Beginning stage: 
Oxfordian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
161.53

    Ending stage: 
Oxfordian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
158.16

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Jingeng Sha (coordinator)