Heavy Mineral Assemblages of Lower Siwalik Nahan Formation, Northwestern Himalaya and Its Significance in Deciphering Provenance

A.R. Chaudhri1*, Rajesh Ranga1, Mahavir Singh2, Vikram Sharma1 and Sarita Mann1

1Department of Geology, Kurukshetra University, Kurukshetra -136119, India

2Groundwater Cell, Department of Agriculture, Karnal -132001, India

*E-mail: archaudhri@gmail.com; rajeshranga333@gmail.com


The Siwalik sediments extend from Jammu and Kashmir to Assam for > 2300 km. The heavy mineral assemblages of the Lower Siwalik Nahan Formation in the type area Nahan has been analysed to decipher the provenance of these sediments. The non-opaque heavy mineral assemblage identified in the purple and grayish-purple to grey coloured sandstones comprising the Lower Siwalik, Nahan Formation and adjoining region in the northwestern Himalaya include zircon, tourmaline, rutile, garnet, epidote, chlorite/chloritoid, biotite and staurolite. Garnet is the most abundant heavy mineral. The opaque minerals form a greater proportion of the mineral assemblage and are represented by ilmenite, magnetite, hematite and limonite. The heavy mineral assemblage is suggestive of the derivation of a major part of the detritus from the crystalline, metamorphic and sedimentary rocks exposed in the North of the Siwalik foredeep basin.

Keywords: Nahan Formation, Lower Siwalik, Sedimentology, Heavy minerals.

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