• SURESH G

      Articles written in Journal of Earth System Science

    • The first report on the chemical (Th–U–Pb) monazite age of the Mul granite pluton, Western Bastar craton, central India and its metallogenic significance

      Dora M L Yamuna Singh Joshi S Kundu A Suresh G Randive K

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      Petrography and the geochemical attributes of the studied Mul granite pluton reveal mixed characteristics of A-type and I-type within-plate granites consistent with an extensional tectonic environment. The dominance of the primary biotite over the primary muscovite suggests its meta-aluminous nature. The dating of monazite from the Mul granitoid pluton by the in situ Th–U–Pb electron probe micro analyser chemical method indicates the tectonomagmatic event around 1602 $\pm$ 27 Ma in the western Bastar craton, Chandrapur district, Maharashtra. The age data possibly represent the emplacement of large bodies of grey granite and attendant monazite crystallisation at $\sim$1600 Ma. This monazite age implies that Mesoproterozoic magmatism is coeval with the formation of the Pranhita Godavari rift in the eastern flank in Maharashtra and associated with the copper and barite mineralisation in Thanewasna and the adjoining areas.

    • Monsoonal rainfall induced shallow earthquake Swarm in the Amravati district of the central India

      MONIKA WADHAWAN NARESH RANA VINEET GAHALAUT MANJEET SINGH KULBIR SINGH SURESH G MISHRA O P AKSHAY KUMAR JOSHI A V KULKARNI MAHENDRA SINGH A K DAS

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      Sadrabadi and Zilphi villages of Dharni Taluka in Amravati district, Maharashtra, experienced small magnitude earthquakes between September 1, 2018 and December 9, 2018. We deployed a four station temporary network of three component broadband seismographs to understand and characterize the earthquake sequence. We find that the short lived (${\sim}$2 months) micro-earthquake (M $\leq$2.4) swarm, accompanying rumbling sound, was highly clustered (3$\times$3 km$^{2}$) and occurred at extremely shallow depth (<0.4 km). Analysis of the data reveal that the earthquake swarm might have been induced by the percolation of monsoonal rainwaters (reaching (${\sim}$100 mm/day) through the cracked volume of soil/rock, associated with the fault system of the Narmada Son failed rift region. Besides revealing the science of earthquake swarm and characterizing it, the monitoring of earthquake swarm and its analysis contributed significantly in reducing the public panic.

      $\bf{Highlights}$

      $\bullet$ We report a case of monsoonal rainfall induced earthquakes from the Narmada Son failed rift region in Amravati district.

      $\bullet$ The earthquake sequence is referred here as an earthquake swarm.

      $\bullet$ The near surface shallow focused micro earthquakes (M$\leq$2.4) occurred in a small region (3$\times$3 km$^{2}$) immediately after the monsoon of 2018.

      $\bullet$ Monitoring of such sequence is important to declare whether the sequence is a swarm activity that may not lead to the occurrence of a strong earthquake in the region.

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