First Reported Occurrence of Igneous Activity in Palnad Basin:Evidence from Venkataramapuram, Nalgonda District, Telangana, India

There is no record of igneous activity in Upper Proterozoic-Kurnool/Palnad sediments. However, Igneous activity was recorded by number of geoscientists in the Cuddapah Super group of rocks in the Cuddapah Basin. For the first time the authors report the occurrence of eruptive igneous activity in the northern part of Palnad Basin,an equivalent of Kurnool Group, South of Venkataramapuram, Nalgonda district, Telangana State. The Igneous activity has affected the basal unit of Banganapalle Formation. Basal conglomerate is polymitic in nature with clasts/cobbles/boulders of dolerite, granite, granodorite, BMQ, meta-quartzite, quartzite, shale and lime stone of Palnad Formation. The average composition of conglomerate matrix (n=7) is 1.75% Fe2O3, 8.07% FeO, 3.74% MgO%, 8.07% CaO and 38.8% SiO2 which corresponds to basic igneous activity.