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Cu Brei Formation
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Cu Brei Fm base reconstruction

Cu Brei Fm


Period: 
Devonian

Age Interval: 
Early Devonian C1cb (22)


Province: 
Middle Trung Bo

Type Locality and Naming

Holostratotype. The South Cu Brei section, exposed in a NE - SW band on the southeastern margin of Cu Brei Mountain, Yaly Commune, Sa Thay District, Kon Tum Province (E = 14°16’25”, E = 107°39’45”; (Deo Go sheet, D-48-72-A of the 1: 50 000 map). Hypostratotype: The section in NW - SE direction, northwest of the Cu Brei Mountain margin (E = 14°17’40”; E = 107°39’ 15”). The Cu Brei Fm was first described by Than Due Duyen (2003) consisting of terrigenous- carbonate sediments, with distribution only known in the Cu Brei Mountain area, Yaly Commune, Sa Thay District, Kon Tum Province.

Synonym:


Lithology and Thickness

Sandstone, gritstone, limestone: Lower part with a 176 m thickness, consists of terrigenous sediments. Upper part consists of terrigenous and intercalated carbonate sediments (33 m thick). Total thickness of the South Cu Brei Section is 209 m.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

The basal conglomerate of the Cu Brei Fm rests unconformably on the biotitc-hornblende granitoid Dien Binh Complex Fm (dated as ca. 400 +/- 20 Ma by K/Ar methods).

Upper contact

In its distribution area the Cu Brei Fm is covered by Quaternary sediments. Next younger regional units are the volcanics of the Permian Dak Lin Fm and Triassic Chu Prong Fm and Mang Yang Fm.

Regional extent

In its distribution area the Cu Brei Fm occurs along a small streambed in a narrow band of 6 km length, 3 km width in a synclinal structure with the northwest - southeast axis, and 40 - 70° on the inclined flank. The formation is divided by latitudinal and meridianal fault systems into two exposed areas - the North and the South Cu Brei areas. The sequence of each area is presented below. At present the formation has only been observed in a small area of Kon Turn Province, but it is possible that a wider distribution of the Cu Brei Fm will be found in the Kon Tum terrane.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[107.2,14.82],[107.36,15.09],[107.65,15.06],[108.05,14.79],[107.95,14.5],[107.76,14.41],[107.45,14.41],[107.3,14.56],[107.2,14.82]]]]}}

Fossils


Age 

The coral and stromatoporoid assemblage and its unconformable contact with Late Silurian-age granites, indicates the Early Devonian age, and it enables one to correlate’the Cu Brei Fm with the Mia Le, Ban Nguon formations, Pragian in age of North Viet Nam.

Age Span: 

    Beginning stage: 
Lochkovian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
419.00

    Ending stage: 
Pragian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
410.51

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).