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Chu Prong Formation

Chu Prong Fm

Period: 
Permian

Age Interval: 
Changhsingian, P3-T1cp, (22, 24)


Province: 
Middle Trung Bo, South Trung Bo

Type Locality and Naming

An Khe and Da Lat basins. Holostratotype. Chu Prong area, sw Pleiku Town (E = 13°15,30"; E = 107°58’30"). The Chu Prong Fm occurs in the Chu Prong, Dak Nao, Tieu Teo, Chu A Mung, Chu Ket, Chu Klin, Pleiklang areas, Kon Turn and Gia Lai Provinces

Synonym: Hệ tầng Chư Prong: Nguyễn Kinh Quốc 1988 (Permi), Trần Tính et al. i 994 (Permi); Tống Duy Thanh et ứ/. 1995 (Permi muộn - Trias sớm); Trần Tính et al. 1998 (Permi muộn - Trias sớm). Hệ tầng Dăk Lin (part.): Nguyễn Xuân Bao et al. l978 (Carbon muộn - Permi sớm)


Lithology and Thickness

Volcanics: Tuffaceous conglomerate, Dacite, Rhyolite. Chu Prong area: (1). Tuffaceous conglomerate, conglomerate, brcccia- conglomerate, gravel-stone, gritstone and tuffaceous lava. Boulders and pebbles are of old metamorphic rock, granitoid, andesite, quartz; cements are from volcanic ash of metadacite, and mctarhyolitc. 200 m thick. (2). Dacite, rhyodacite and their tuffs, thin interbeds or lenses of banded agglomerate, felsite, 200 – 250 m thick. (3). Rhyolite, felsic and their tuffs, 180-200 m thick. The total thickness of the formation in this section is about 580 – 620 m.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

Unconformably on the Dak Lin Fm.

Upper contact

Unconformably below the Dray Linh Fm of early Jurassic. Regionally, the next younger unit is the Mang Yang Fm volcanics of late Anisian (which contains andesite xenoliths of the Chu Prong Fm).

Regional extent

The Chu Prong Fm occurs in the Chu Prong, Dak Nao, Tieu Teo, Chu A Mung, Chu Ket, Chu Klin, Pleiklang areas, Kon Tum and Gia Lai Provinces. In the An Khe and Da Lat basins, the Chu Prong Fm is the only formation of the Upper Permian-Lower Triassic Sequence, with a supposed age of late Changhsingian


GeoJSON

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Fossils


Age 

Stratigraphic constraints and intrusion by dated granitoids of the Ben Giang – Que Son Fm indicate a dating of Late Permian, possibly Changhsingian.

Age Span: 

    Beginning stage: 
Changhsingian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
254.24

    Ending stage: 
Changhsingian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
251.90

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).