Magnetostratigraphic study of the Bhuban Formation (Surma Group) in Midum Kham, Aizawl, Mizoram

Lalengzuali , Paul Lalnuntluanga, J Malsawma, C Lalremruatfela, Lalhruaitluanga, Lalremruata, Dennis Lalhruaitluanga, Orizen MS Dawngliana, Lalramengi Fanai, Arman Boruah

Science Vision 26 (1), 27-37 | Published on 11 June 2026 | https://doi.org/10.33493/scivis.26.01.05

Abstract

Magnetostratigraphic analysis was conducted on a ~380 m thick succession of the upper Bhuban Formation (Surma Group) exposed between Thiak and Sumsuih villages in Aizawl District, Mizoram. The study section yielded three normal and two reverse magnetozones, with GPTS-correlated ages ranging from ~9.308 Ma at the base to ~8.699 Ma at the top, spanning a total duration of ~0.609 Ma. The average sediment accumulation rate (SAR) is approximately 24.305 cm/ka, the lower part of the section exhibits a peak of 46.8 cm/ka prior to ~9.65 Ma. The subsequent decline in SAR to 11.02 cm/ka at approximately 9.45 Ma suggests a potential hiatus in the upper part of the succession that warrants further investigation.

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