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Aravalli Supergroup; Jharol Formation; turbidites; rift-basin; stratigraphy.

The enormously thick sedimentary succession exposed between Rishabhdev Lineament and rocks of the Delhi Supergroup constitutes Jharol Formation of the Aravalli Supergroup in Udaipur region of Rajasthan. The whole sedimentary succession is named Jharol Formation and designated as deep water turbidites. A detailed field examination indicates presence of two distinctly different litho successions juxtaposed across a crustal level fault along which brecciated ultramafics are tectonically emplaced. The sedimentary successions exposed immediate west of the Rishabhdev Lineament are deep water sediments with distinct facies types characterizing inner to outer lobe stacked turbidites. These turbidites are similar to the turbidites of the Udaipur Formation and Tidi Formation exposed east of the Rishabhdev Lineament. However, the sedimentary succession exposed west of these deep water sediments across the aforesaid fault contains facies types that represent continental to shallow marine deposits. This basin marginal sediments continue up to the contact with rocks of the Delhi Supergroup. Such litho-association suggests that a separate formation status of the sediments lying west of the Rishabhdev Lineament should be dropped and the turbidites of the Udaipur Formation should be considered as the youngest formation of the Aravalli Supergroup.

BHATTACHARYA H N¹ AMRITA MUKHERJEE¹

1. Department of Earth Sciences, Techno India University, Salt Lake, Kolkata 700 091, India.

Published

15 July 2020

Manuscript received

22 December 2019

Manuscript revised

25 March 2020

Accepted

4 April 2020

Final version published online

8 July 2020