Abstract
Heavy mineral assemblages of sedimentary units are used as an essential provenance constraint. The sedimentary successions of the southern Assam and Siwalik foreland basins were analyzed for their heavy mineral suits and provenance determination. Heavy minerals were identified using the petrological microscope, X-ray Diffraction (XRD) and Electron Probe Micro Analyzer (EPMA) analyses. The study demonstrates that heavy minerals weight percentage in the southern Assam basin is lower than that of the northeast (NE) Siwalik basin. In the Assam basin, the weight percentage of dense minerals varies from 0.08% to 1.31%; however, in the Siwalik sediments, it varies from 2.27% to 5.78%. The relative dominance of opaque minerals over transparent heavy minerals is observed throughout the Cenozoic rocks of Assam basin, except for the Tipam unit. At the same time, the Siwalik basin successions show a low percentage of opaque minerals and high amount of non-opaque heavies. Detritus in the Assam basin reveals a distinct change in the occurrence of heavy mineral assemblages (amphibole, aluminosilicates, staurolite and a high percentage of epidote, pyroxene and sphene) in the Mio-Pliocene unit (Tipam sandstone) compared to Barail and Surma older units, implying involvement of an additional orogenic source. This study suggests that NE Siwalik sediments were primarily derived from Himalayan rocks of the Siang window, while heavies in the detritus of the southern Assam basin exhibits a mixed provenance both from the eastern Himalaya, chiefly from Dibang and Lohit valley and Indo-Burman-Ranges (IBR).
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PR thanks IIT Bombay for funding the research fellowship and necessary facilities. The funding from the Ministry of Earth Science (MoES) to GM (MoES/P.O.(Geosci)/2/2012) is gratefully acknowledged. We thank our driver Mr. Mustaq for driving us during fieldwork. We extend our most profound appreciation to the anonymous reviewers and the handling editor for their comments and suggestions, which significantly improved the manuscript.
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Rai, P., Borgohain, B., Chettri, N. et al. A Comparative Heavy Mineral Study of the Cenozoic Sediments of Assam and Siwalik Foreland Basins, Northeast Himalaya. J Geol Soc India 96, 475–484 (2020). https://doi.org/10.1007/s12594-020-1585-y
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DOI: https://doi.org/10.1007/s12594-020-1585-y