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Malani LIP Formation
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Malani LIP Fm base reconstruction

Malani LIP Fm

Period: 
Tonian

Age Interval: 
within 770-750 Ma


Province: 
NW.India Rajastan-Barmer Basin

Type Locality and Naming

Synonyms: Malani Series/Malani suite/Malani igneous province/Malani System/Malani Igneous Suite/Malani; Group/Malani Rhyolite


Lithology and Thickness

Volcanics. Malani intrusion consists of three phases: extrusive phase of bimodal volcanism:

mafic followed by felsic flows; intrusive phase of felsic granite plutons; and hypabyssal phase of basic and felsic dike intrusions along rift fractures

[Figure 1: Detailed stratigraphy in the Barmer Basin, with newly proposed stratigraphic units, linked to summary tectonic evolution and reservoirs, seals and source rocks in the basin. (Dolson et al., 2015)]


Lithology Pattern: 
Lava


Relationships and Distribution

Lower contact

Unconformably overlies the Archean-Proterozoic metasediments and granite gneisses

Upper contact

Unconformably overlain by the Lathi Fm.

Regional extent

Balmer Basin and adjacent.

[Figure 2: Stratigraphic Correlation of Rajasthan Basins (from dghindia.gov.in)]


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[70.79,25.63],[71.05,26.35],[71.53,26.53],[71.72,26.19],[71.54,25.64],[70.79,25.63]]]]}}

Fossils


Age 

751–771 Ma (Torsvik et al. 2001); 745 +/- 10 Ma (Crawford and Compston 1969); age-date would imply late Tonian.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
776.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.9

    Ending date (Ma):  
748.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

From appendix table in Dasgupta, S., and Mukherjee, S. (2017), Brittle Shear Tectonics in a Narrow Continental Rift: Asymmetric Nonvolcanic Barmer Basin (Rajasthan, India). J. Geol., v. 125, no. 5