Cobuza Fm
Period:
Carboniferous
Age Interval:
C21−C2 (62), late Early Carboniferous to Late Carboniferous
Province:
Xizang (Tibet)
Type Locality and Naming
The type section is located at Cobuza, about 70 km south of Bangkog, Tibet. It was named by Han Tonglin in 1983.
Lithology and Thickness
Volcanics. Dark purple and dark-gray altered andesites with a porphyritic texture. The phenocrysts are mainly feldspar and dark-colored minerals, generally 1−2 mm in diameter, and the larger ones may reach 10 mm. They show an unapparent directional arrangement at places, also with an amygdaloidal structure. Thickness is over 400 m
Lithology Pattern:
Volcanics
Relationships and Distribution
Lower contact
Unknown: bottom boundary is not seen
Upper contact
Unknown: top is contacted with the Dalakongma Fm by a fault
Regional extent
Distributed around Dalakongma and Cubuza west of Nam Co
GeoJSON
null
Fossils
Age
late Early Carboniferous to Late Carboniferous
Age Span:
Beginning stage:
Visean
Fraction up in beginning stage:
0.0
Beginning date (Ma):
346.73
Ending stage:
Moscovian
Fraction up in the ending stage:
0.15
Ending date (Ma):
313.93
Depositional setting
It is interpreted as a volcanic eruptive facies
Depositional pattern:
Additional Information
Compiler:
Fan Yingnian