Abstract
A significant occurrence of olivine and serpentine (antigorite, lizardite) are reported for the first time in the Dihing sedimentary unit of upper Assam. Petrography of the Dihing Formation documents olivine, serpentine (antigorite, lizardite), pyroxene and major framework grains (quartz, feldspar and variety of lithic fragments). Based on modal composition, the Dihing unit samples are classified as lithic arenite. Heavy mineral analysis in addition to the above, provides evidence of other minerals such as zircon, tourmaline, rutile, garnet, epidote, amphibole, sphene, aluminosilicates, apatite, spinel, staurolite, chloritoid, chlorite and mica. The heavy mineral assemblage is dominated by olivine (36.9%) and pyroxene (16.5%). The low (10.7%) zircon–tourmaline–rutile (ZTR) index infers mineralogically immature nature of sediments. Raman spectroscopy confirms the presence of antigorite and electron microprobe analysis corroborates the existence of olivine, pyroxene, serpentine and chrome-spinel in the analyzed samples. The imbricated clasts and cross-bedding sedimentary structures indicate SSW to SW paleo-current direction. The peridotite and serpentinite rocks of the Tidding suture zone from the Lohit–Dibang valleys are suggested as the likely sediment provenance for olivine and serpentine minerals. We advocate that the Lohit and Dibang rivers earlier flowed close to the Indo-Burman Ranges (IBR) depositing the Plio-Pleistocene Dihing sediments before merging with the Brahmaputra river.
Research Highlights
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First report of detrital olivine and serpentine minerals in the Dihing unit of upper Assam.
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Petrography, heavy mineral, XRD and EPMA analyses show the presence of olivine, pyroxene, serpentine and chrome spinel.
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Clast imbrications and current-bedding indicate SSW to SW paleocurrent direction.
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Peridotite and serpentinite rocks of the Tidding suture zone from the Lohit–Dibang valleys are inferred as the source.
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The Lohit and Dibang rivers seem to have carried detritus from source to sink.
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Acknowledgements
PR acknowledges Teaching Assistantship (TA) fellowship funded by IIT Bombay. PR and GM thank Prof S C Patel and Mr Javed M Shaikh for EPMA analysis at the Department of Earth Sciences, IIT Bombay. The authors thank Dr Biraj Borgohain for his help in the field. The funding from the Ministry of Earth Science (MoES) to GM (MoES/P.O. (Geosci)/2/2012) is gratefully acknowledged. We extend our most profound appreciation to the handling editor Prof N V Chalapathi Rao for his comments. Authors thank the anonymous reviewers for their critical reviews, which significantly improved the manuscript. Authors are also thankful to Dr Trupti Chandrasekhar for her help in PXRD.
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Author confirms the contribution of co-author to draft this manuscript. PR and GM conceived the idea, carried out field work. PR performed all the analyses. PR and GM contributed equally towards the manuscript.
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Rai, P., Mathew, G. Presence of detrital olivine and serpentine minerals in the Dihing unit of upper Assam: Implication towards the source. J Earth Syst Sci 130, 86 (2021). https://doi.org/10.1007/s12040-021-01581-7
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DOI: https://doi.org/10.1007/s12040-021-01581-7