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Suoi Be Formation

Suoi Be Fm

Period: 
Permian

Age Interval: 
Late Permian, (8)


Province: 
West Bac Bo

Type Locality and Naming

Volcanics chiefly in the northeastern margin of the Song Da – Tu LeBasin; but with a composition differing from the volcanics of the Cam Thuy Fm and Vien Nam Fm.

Synonym:


Lithology and Thickness

Volcano-sedimentary beds of mainly mafic composition. Characteristic section in Suoi Be area is 1150-1250 m of: (1) Tufffaceous conglomerate, sandstone and siltstone, interbedded with some lenses of aphyric basalt. (2) Dark green-gray plagio-basalt, andesite-basalt and trachyto-basalt interbedded with tuffs and tuffaceous shale.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

Not yet observed. Next older regional unit is the carbonate platform of the Bac Son Fm (Carboniferous-early Permian).

Upper contact

Possibly it has a tectonic contact with the Tu Le Fm.

Regional extent

Distributed in a large band from the Phu Yen District through the Bac Yen one and westwards, binding the southeastern end of the Tu Le Basin (in Yen Bai Province). There is another band of this basin in Muong La District (Son La Province) and extending to the basin center.


GeoJSON

null

Fossils


Age 

Intruded by the Ngoi Thia Complex Fm dated by SHRIMP as 256 ±4 Ma, therefore attributed to Changhsingian (same age as Cam Thuy Fm and Vien Nam Fm). [For graphic purposes, because it is overlain? by the late-Wuchiapingian-age Tu Le Fm volcanics, then displayed here as middle Wuchiapingian.]

Age Span: 

    Beginning stage: 
Wuchiapingian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
257.43

    Ending stage: 
Wuchiapingian

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
255.83

Depositional setting


Depositional pattern:  

Additional Information


Compiler:  

Tran Van Tri and Vu Khuc (Editors; Geology and Earth Resources of Viet Nam, General Dept. of Geology and Minerals of Viet Nam; completed in Dec., 2011), with additional details from Tong-Dzuy Thanh and Vu Khuc (Editors; Stratigraphic Units of Viet Nam, 2nd edition; 2011; English edited by A. Boucot).