Abstract
The present study deals with the petrographic interpretation of Talchir Formation sandstone, in and around Chirimiri area, Koriya district, Chhattisgarh state India located in Son-Mahanadi basin. This basin is an elongate graben showing northwest-southeast trend and considered to be one of the largest intra-cratonic rift basins of Indian peninsula. Talchir Formation is the lowermost unit of thick classical Gondwana sedimentary succession and rests unconformably on Precambrian basement. The petrographic studies consisting of point count show the presence of quartz as a dominant framework mineral with subordinate amounts of feldspars and rock fragments. The data plot in the fields of cratonic interior and transitional margin of continental block provenance. In the Qt (quartz)-F (feldspar)-L (lithic fragments) triangular diagram, indicating the source of these sediments was located in transitional margin and continental block provenance. The petrographic classification suggests that this formation in the study area dominantly contains compositionally immature to submature arkosic, sub-arkosic and lithic-arkosic sandstones. The bivariate plot between Qp/(F+R) vs. Qt/(F+R) indicates changes in climatic conditions from semi-arid to semi-humid during Permo-Carboniferous period.
Highlights
The compositions of sandstone have been widely used by sedimentologists during past several decades to decipher the provenance, paleoclimate and tectonic setting of the source areas [1,2,3,4,5,6,7,8,9]
Determination of different aspects of provenance viz its location with respect to depositional basin, lithology, climate and tectonic setting is some of the important parameters of basin analysis [11]
The modal analysis of studied Talchir sandstones (Table 3), plotted on ternary diagram indicates that the sediments of Talchir Formation of Chirimiri, Koriya district, IJG
Summary
The compositions of sandstone have been widely used by sedimentologists during past several decades to decipher the provenance, paleoclimate and tectonic setting of the source areas [1,2,3,4,5,6,7,8,9]. Determination of different aspects of provenance viz its location with respect to depositional basin, lithology, climate and tectonic setting is some of the important parameters of basin analysis [11]. Indian plate is an assembly of several micro continents, sutured along early/middle Proterozoic Mobile belts [13,14,15] These mobile belts became the locales of rift nucleation and played a fundamental role in the mechanism of rift propagation along reactivated ancient shear zones [15,16,17,18]. These intra-cratonic rifts are referred to as Gondwana basins
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