The P3 kimberlite and P4 lamproite, Wajrakarur kimberlite field, India: mineralogy, and major and minor element compositions of olivines as records of their phenocrystic vs xenocrystic origin

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

“…This rock may be classified as hypabyssal-facies-phlogopite-bearing macrocrystal kimberlite. Recent studies based on detailed petrography and mineral chemistry also confirmed that this is a kimberlite (Shaikh et al, 2018).…”

“…Drilling revealed that the 'yellow ground' continues to a depth of 10 m and is underlain by 'blue ground' (Rao et al, 1997). Hand specimens show a characteristic inequigranular texture imparted by olivine, occuring as macrocrysts and smaller subhedral to euhedral phenocrysts wth subordinate amounts of serpentine, spinel, perovskite, apatite, calcite and rare baddeleyite (Shaikh et al, 2018). Olivine macrocrysts are fresh relative to their groundmass counterparts, which are completely altered to serpentine.…”

“…In India, majority of the documented research work related to kimberlites provided a great knowledge in understanding the petrology, geochemistry, geochrnology and geophysics of Indian kimberlites (e.g. Akella et al, 1979;Reddy 1987, Rao et al, 1998Anil Kumar et al, 2002;Chalapathi Rao et al, 2005;Paul et al, 2006;Anil Kumar et al, 2007;Chalapathi Rao et al, 2009;Ian et al, 2011;Chalapathi Rao et al, 2016;Dongre et al, 2016;Xu et al, 2017;Shaikh et al, 2018). Despite the vast research on petrological aspects of kimberlites and lamproites, published literature pertaining to application of soil or regolith geochemistry in identifying mineral deposits in general and diamond exploration in particular, in the Indian context, is limited to a very few publications (e.g.…”

Kimberlites, lamproites and lamprophyres from the Indian shield: Highlights of researches during 2016-2019

“…Major and minor element compositions of olivines from the P3 kimberlite and P4 lamproite (Wajrakarur field) have been studied in detail by Shaikh et al (2018). Based on textural and compositional variations, three distinct populations of olivine, phlogopite, and clinopyroxene have been identified.…”

“…The third generation of olivine is phenocrystic as deduced from euhedral nature that crystallized at mantle depths and is essentially of magmatic in origin. Shaikh et al (2018) concluded that the metasomatized wall-rock for the lamproite contained abundant MARID-type as well as phlogopite-rich metasomatic veins, however, the source for kimberlites was relatively refractory.…”