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Langba Formation

Langba Fm

Period: 
Carboniferous

Age Interval: 
C12 (68), Visean (middle Early Carboniferous)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is lies from Shaogang Village to Manze of Kangmar County, Tibet. It was named by Liang Dingyi and Wang Weiping in 1983.


Lithology and Thickness

Metamorphosed Claystone and Limestone. A suite of metamorphic rocks. Lower member is formed by coarse-grained schists, consisting of two-mica quartz schist, quartz schist and garnet quartz schist, intercalated with marble, amphibole-schist, etc., with occurrence of staurolite, kyanite, garnet and mica schist near the granite body. Intruded by granite in the basal part, but the bottom is unexposed, thickness >500 m. Upper part is the marble member, formed by banded sandy marble, 4−60 m thick.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

Unknown: The bottom is unexposed

Upper contact

Conformable contact with the overlying Guzi Fm

Regional extent


GeoJSON

null

Fossils


Age 

Assigned as Visean (middle Early Carboniferous)

Age Span: 

    Beginning stage: 
Visean

    Fraction up in beginning stage: 
0.1

    Beginning date (Ma): 
345.09

    Ending stage: 
Bashkirian

    Fraction up in the ending stage: 
0.05

    Ending date (Ma):  
322.99

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Fan Yingnian