Whole rock geochemical characterization of chintalapalle lamproite dyke, nw margin of Cuddapah basin, eastern Dharwar Craton, South India Saidulu K.1,*, Rajeshwari G.2, David K.1 1Department of Geology, Kakatiya University, Warangal, Telangana State, India 2Department of Geology, Osmania University, Hyderabad, Telangana State, India *E-mail: saidulukala9797@gmail.com
Online published on 2 August, 2023. Abstract We present here the whole rock geochemistry along with field and petrographical studies of recently reported Chintalapalle Lamproite Dyke (CHPL), NW margin of Cuddapah Basin, Eastern Dharwar Craton, South India. The CHPL is a fracture controlled E-W trending 90-meter in length isolated discontinuous body intruded into basement granitic gneiss. Texturally, CHPL is porphyritic to weakly porphyritic essentially comprising microphenocrysts of sanidine and potassic richterite, set in a groundmass rich in carbonate, and chlorite with rutile and titanate as accessory phases. Geochemically,CHPLsamples are characterized by high MgO (16.06-19.44 wt.%), TiO2 (1.56-3.29 wt.%), K2O (3.69-4.71 wt.%), P2O5 (1.81-3.94 wt.%) and low Na2O (1.21-1.40wt.%), Al2O3 (4.10-5.12 wt.%),SiO2 (49.07-49.98 wt.%) exhibits silica undersaturated to slightly saturated compositions. All the samples are typical lamproites occupying their representative fields when plotted in Al2O3(wt%)- FeOT(wt%)-MgO and MgO-K2O Al2O3- diagrams. The high Nb/2 (78.6-99ppm) and low Hf (10.9-14.6ppm), Th (3.6-9.4ppm) concentrations conform the anorogenic origin of CHPL.Chondrite normalized rare earth elements show LREE enrichment and HREE depleted distribution patterns. Top Keywords Lamproite, Chinthalapalle, Paleo-Mesoproterozoic, Cuddapah Basin. Top |