Reappraisal on Depositional Environments of Glaciogenic Talchir Sediments around Savarla Village from Bandar Basin, Chandrapur District, Central India

Abstract

The present study brings out the reappraisal of mode of depositional conditions of the Talchir sediments from Savarla village of Bandar Basin, Chandrapur district of Maharashtra. These sediments correspond to four lithofacies namely, (i) basal massive diamictite (bmd), (ii) stratified diamictite and sandstones (sds), (iii) medium- to fine-grained sandstones (mfs) and (iv) siltstones-shale. The bmd facies characterizing laterally discontinuous, unstratified and matrix- to clast-supported sediments represent the continental tills. The sds facies corresponding to melting of glaciers at outwash plains reveal the decrease in the boulder and cobble clasts and increase in pebble clasts. The mfs facies associated with the very thin, fine-grained sand and varves represent glacio-lacustrine depositional conditions with suitably developed still water bodies and even ice-dammed lakes. The petrographic characteristics of these sediments, which bring out textural immaturity and depiction of QFR triangular diagram, divulge interior type of continental block provenance with cold-arid palaeoclimate. The microtextures like high relief, conchoidal breakage pattern, arc shaped steps, semi parallel steps, globular protuberances as well as striations along with ‘v’ shaped indentations noted from SEM photomicrograph clearly point out towards the glaciogenetic influence.