Global Geology 2016, 19(4) 205-215 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Keywords
Palynofloral changes
Cretaceous-Paleogene boundary
Deccan
volcanic associated sediments
India
Authors
Bandana Samant and D. M. Mohabey
PubMed
Article by Bandana Samant and D. M. Mohabey

Tracking temporal palynofloral changes close to Cretaceous- Paleogene boundary in Deccan volcanic associated sediments of eastern part of central Deccan volcanic province

Bandana Samant and D. M. Mohabey

Department of Geology,Rashtrasant Tukadoji Maharaj Nagpur University,Nagpur 440001,India

Abstract

Deccan volcanic sequences (DVS) in the central Deccan volcanic province (CDVP) are designated as Sahyadri Group having ~ 500 m thick lava pile associated with multiple sedimentary beds at different strati- graphic levels. In the eastern part of CDVP between the latitude 19°55'--20°25'N and the longitudes 78°15'--78° 30'E,palynological investigation of the intertrappean sedimentary beds at five stratigraphic levels was carried out. The study was basically aimed for tracking the floral and environmental changes across the Deccan transi- tion. The resulting finds indicate that the intertrappean sediments at the lowest stratigraphic level between the earliest lava flows are characterized by presence of marker Maastrichtian palynomorphs- Gabonisporis vigour- ouxii,Aquilapollenites bengalensis,Azolla cretacea and Farabeipollis associated with triporate and tricolpate pol- len grains,phytoliths of Oryzeae of Poaceae family and peridinoid dinoflagellate cysts. The increasing volcanism deteriorated the existing flora as evident by absence of pollen-spores and presence of only structured biodegraded organic matter,fungal spores,acritarchs and algal (Botryococcus) remains in the sediments of higher-up in the sequence. For chronostratigraphic constraints on the lava flows magnetic polarity of the flows bracketing the in- tertrappean beds was investigated. The results indicated presence of N-R-N-R magnetic polarity in the basal la- va pile that are interpreted as representing the magnetochron C30N to C28R (Maastrichtian-Paleogene). The floral change begins with the onset of volcanism in the chron C30N and floral deterioration is observed in C29N with increasing volcanism and it is only in the chron C28R(Danian) that some evidence of recovery of flora is recorded. The current study shows that in eastern part of CDVP the post Cretaceous-Paleogene boundary erup- tions represent the main phase of eruptions that triggered deterioration of the flora.

Keywords Palynofloral changes   Cretaceous-Paleogene boundary   Deccan   volcanic associated sediments   India  
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