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Sa Pa Gr

Sa Pa Gr

Period: 
Ediacaran

Age Interval: 
Late Ediacaran, NP, (7, 8, 10)


Province: 
West Bac Bo

Type Locality and Naming

Upper formation of the Cha Pa Gr. The type section is located in 25 km southwest of Lao Cai Town (N = 22 0 23', E = 103 ° 52'). It was named after the Da Dinh mountain/village by Nguyen Van Hoanh et al., 2000.

Synonym: Điệp Dá Đinh (Upper Proterozoic): Kalmykov A.F.; Trần Văn Trị 1965. Série de Sa Pa: Jacob C. 1921 (Algonkien). Série de Coc Xan (part.): Fromaget J. 1937. (Algonkien supérieur). Hệ tầng Sa Pa (Upper Proterozoic): Bùi Phú Mỹ et al. 1971. Trần Văn Trị et al. 1977. Hệ tầng Chiêm Hoá (part.): Dovjikov A.E. et al. 1965 (Proterozoic)


Lithology and Thickness

Characteristic section at Da Dinh Mt is 600 m thick: (1). Fine to medium-grained, medium-bedded tremolite-bearing sugary-texture marble, grading upwards into fine- to coarse-grained dolomitic marble and white, medium-bedded to massive dolomite; 250 m thick. (2). White, medium-grained, thick-bedded to massive dolomitic marble interbedded with banded marble containing tremolite, muscovite and scapolite; 350 m thick.


Lithology Pattern: 
Dolomite


Relationships and Distribution

Lower contact

Conformably upon the Cha Pa Fm.

Upper contact

Unconformably beneath conglomerate of the Lower Cambrian Cam Duong Fm.

Regional extent

Bands and small massifs of limestone mountains scattered from Lao Cai Province to Yen Bai Province.

Correlative with the Dongying Fm limestone in Yunnan of Sinian age.


GeoJSON

null

Fossils

No fossils.


Age 

Late Neoproterozoic according to conformably below the Cam Duong Fm that is assigned as Early Cambrian. Assumed to only be upper Ediacaran here, because there no indication of Cryogenian glacial deposits in the underlying Cha Pa Fm.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
586.90

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
538.80

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).