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Porcellanite Formation
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Porcellanite Fm base reconstruction

Porcellanite Fm

Period: 
Statherian

Age Interval: 
late Statherian


Province: 
Proterozoic N.India Vindhyan Basin east

Type Locality and Naming

Middle formation (3 of 5) of Lower Vindhyan Gr in East


Lithology and Thickness

Volcanics. A thick (ca. 400 m) suite of silicified tuff, pyroclastic flows and surge deposits.


Lithology Pattern: 
Volcanic ash


Relationships and Distribution

Lower contact

Underlain by Kajrahat Limestone Member of Kajrahat Fm

Upper contact

Overlain by Koldaha Shale Member of Kheinjua Fm

Regional extent

There are possible similar porcellanite beds within the Palri Shale Fm of the Chambal Valley sector.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[78.94,23.85],[81.15,24.8],[84.23,24.42],[83.66,23.71],[79.58,22.73],[78.94,23.85]]]]}}

Fossils


Age 

A 1628 +/- 8 Ma age from upper-middle of formation. See discussion in Lower Vindhyan Gr; for graphic purposes 1640-1625 Ma.

Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
1,640.00

    Ending stage: 
Statherian

    Fraction up in the ending stage: 
0.88

    Ending date (Ma):  
1,624.00

Depositional setting

Suggests active volcanism in the near vicinity of this basin. Frequent subaerial to subaqueous transitions may either represent sea-level fluctuations and/or fluctuations in volcaniclastic output. Clays associated with the porcellanites and glauconites from adjacent formations provide geochemical evidence of felsic volcanism.


Depositional pattern:  


Additional Information


Compiler:  

Main sources: S. Sarkar and S. Banerjee (2020), A Synthesis of Depositional Sequence of the Proterozoic Vindhyan Supergroup in Son Valley, Springer Geology, https://doi.org/10.1007/978-981-32-9551-3_2

Basu, P., and Chakrabarti, R. 2020. Origin and evolution of the Vindhyan Basin: A geochemical perspective. Proc. Indian Natn. Sci. Acad., 86: 111-126.