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Mawgyi Andesites Formation
Click to display on map of the Ancient World at:
Mawgyi Andesites Fm base reconstruction

Mawgyi Andesites Fm

Period: 
Cretaceous

Age Interval: 
Mid-cretaceous


Province: 
Myanmar Central Basins

Type Locality and Naming

Central Volcanic Line (Upper Irrawaddy Province), in the Banmauk segment of the Upper Irrawaddy Province, andesitic rocks termed the Mawgyi Andesites (Mitchell 1993) [Original Publication: Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 143–167]

[Figure: Map showing location of sub-basins of the Central Myanmar Basin (after Myint Thein and M. Maung 2017)]


Lithology and Thickness

Intruded by granodiorite batholiths.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

Conformable with Khanza Chaung Granodiorite

Upper contact

This is the youngest unit in Upper Irrawaddy Province

Regional extent

It is developed in Upper Irrawaddy Province

[Figure: a) Composite stratigraphic correlation of Myanmar Central Basins (after Than et al., 2017)]


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[97.36,26.84],[95.62,26.11],[94.83,24.64],[94.19,22.39],[94.3,20.38],[95.11,17.51],[96.41,17.81],[95.95,20.52],[95.51,22.18],[96.28,24.52],[96.96,24.26],[97.82,25.42],[97.36,26.84]]]]}}

Fossils


Age 

Based on K–Ar dating the age of the granodiorites is 93.7 ± 3.4 Ma (Mid-Cretaceous) (Mitchell 1993).

Age Span: 

    Beginning stage: 
Turonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
93.90

    Ending stage: 
Turonian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
91.65

Depositional setting

Marine


Depositional pattern:  


Additional Information


Compiler:  

Naing Maw Than, Kyi Khin and Myint Thein (Than et al., Cretaceous geology of Myanmar and Cenozoic geology in the Central Myanmar Basin, Chapter 7 in Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 143–167)