Indian Journal of Science and Technology
Year: 2023, Volume: 16, Issue: Special Issue 1, Pages: 208-218
K Lalduhawma1, V Vanthangliana2*, Bubul Bharali2, Shiva Kumar3, Gautam Raj Bawri3
1Dept. of Geology, Lunglei Govt. College, Lunglei, Mizoram, India
2Dept. of Geology, Pachhunga University College, Aizawl, Mizoram, India
3Dept. of Geology, Mizoram University, Aizawl, Mizoram, India
Email: [email protected]
Received Date:23 January 2023, Accepted Date:09 June 2023, Published Date:13 September 2023
Objectives: The present investigation focuses mainly on the depositional environment and diagenetic processes of Bhuban sandstone using petrographical investigation in and around Lunglei town. Methods: A comprehensive field investigation was carried out to investigate the lithofacies variation and thin section examination of the Bhuban Sandstones. A total of 37 representative rock samples were collected during fieldwork from different localities in and around Lunglei Town. Leica DME2700 P petrological microscope with Leica DFC420 camera and Leica Image Analysis software (LAS-v4.6) installed at the Department of Geology, Mizoram University, was used to conduct petrographic and modal analysis. Findings: Petrographic analysis of thin sections show that the grains are fine to medium, moderately sorted, and have sub-angular to subrounded shape. According to the petrographic plots and thin section studies, the majority of the rocks are Sublitharenite with a little amount of Sub Arkose. The sediments may have originated from a continental orogen-type source and were deposited in a shallow marine environment. The plutonic sources with some upper to lower-rank metamorphics constituted the majority of the sediments. Additionally, prior to deposition, the sediments underwent a modest amount of weathering due to the humid climate. The study also reveals straight, concavo-convex, and suture contact, frequently deformed micas conforming to the grain boundary of quartz, and common flowage of clay minerals along the pores of the grain suggesting a high degree of compaction. In addition, the dissolution of quartz, potash feldspar, and plagioclase feldspar subsequently replaced by other minerals suggested a mesogenesis to telogenesis for the events of diagenesis of the Bhuban sandstones of the study area. Novelty: Based on petrographical studies, Bhuban sandstones are derived from plutonic sources with a moderate degree of weathering and deposited in an active continental margin setting. Moreover, the sandstones in the study area underwent a high degree of compaction.
Keywords: Surma Basin; Bhuban sandstone; Diagenesis; Lunglei; Quartz; Sublitharenite
© 2023 Lalduhawma et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Published By Indian Society for Education and Environment (iSee)
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