Discovery of Lamproites near Vattikod Area, NW Margin of the Cuddapah Basin, Eastern Dharwar Craton, Southern India

Abstract

A cluster of lamproite dykes are located 1 km west of Vattikod village at the NW margin of the Cuddapah basin, Eastern Dharwar craton, southern India, during the pursuit for locating primary diamond source rocks by adapting multifarious applications. These exotic rocks are emplaced along WNW-ESE to NW-SE trending fractures in the granitic rocks belonging to the Peninsular Gneissic Complex. Ten out of twelve lamproites occur near Vattikod village and one each is located in the vicinity of Marepalli and Gundrapalli villages respectively. These lamproites, though highly altered, contain microphenocrysts of altered olivine, clinopyroxene, phlogopite, leucite and sanidine and translucent to opaque, amoeboid shaped patches of glass set in a groundmass rich in carbonate, phlogopite, serpentine, and chlorite. This new cluster of lamproites constitutes a part of the recently discovered Ramadugu lamproite field. The Vattikod and Ramadugu lamproites, together with those from Krishna lamproite field and the Cuddapah basin, constitute, a wide spectrum of ultrapotassic magmatism emplaced in and around the Palaeo-Mesoproterozoic Cuddapah basin in southern India.

Mineralogy of the baotite-bearing Gundrapalli lamproite, Nalgonda district, Telangana, India

“…The Ramadugu dykes are emplaced in the Peninsular Gneissic Complex of the Eastern Dharwar block (Fig. 2; Sridhar and Rau, 2005; Ahmed and Kumar, 2012; Kumar et al ., 2013; Chalapathi Rao et al ., 2014; Gurmeet Kaur et al ., 2018). The Gundrapalli dyke of the Ramadugu lamproite field was discovered by Ahmed and Kumar (2012).…”

Emplacement of Lamproites in and around Ramadugu, Nalgonda District- ground Magnetic evidence

“…Thus, intersection of linear trends, bulging of contours, low magnetic anomalies are favorable indicators in their search (Ramachandran et al 1999) Interestingly, the magnetic anomalies in the Ramadugu region (Fig. 2d) (Joy et al 2012;Kumar et al 2013;Reddy et al 2003;.Sridhar and Raju, 2005) …”

Role of trace element Pedogeochemistry in Diamond Exploration- A first Report from Lattavaram Kimberlite Cluster, Wajrakarur Field, Eastern Dharwar Craton, southern India

“…These four fields are located towards the western margin of the Paleo-Mesoproterozoic Cuddapah sedimentary basin within a typical Archean granite-greenstone terrain comprising the Dharwar supracrustal schist belts and granitoids (Peninsular Gneissic Complex) (Fig.2). In addition, the Cuddapah Basin of Proterozoic age, has recorded more than 47 occurrences of lamproites in its northwestern and northeastern margins, distributed in five lamproite fields: Banganapalle Lamproite Field (BLF), Krishna Lamproite Field (KLF), Nallamalai Lamproite Field (NLF), Ramadugu Lamproite Field (RLF), Vattikodu Lamproite Field (VLF) and Somasila Lamproite Field (SLF) (Naqvi, 2005;Sridhar and Rau, 2005;Alok Kumar et al, 2013;Chalapathi Rao et al, 2014, Ahmed et al, 2016. The WKF, endowed with more than 45 kimberlite occurrences, is the largest among all kimberlite fields in its areal extent spanning over ~9500 km 2 (Das Sharma and Ramesh, 2013;Shaikh et al, 2016).…”