Differences in natural gamma radiation characteristics of Erinpura and Malani granites in NW India

  • Lars ScharfenbergEmail author
  • Sebastian Jandausch
  • Lina Anetzberger
  • Anette Regelous
  • Kamal K Sharma
  • Helga De Wall


In NW India, large volumes of exposed Neoproterozoic basement rocks are formed by two magmatic suites, Erinpura granites as a late thermal event with respect to the \({\sim }\)1 Ga Delhi Orogeny and the younger Malani igneous suite (770–750 Ma). Average uranium and thorium equivalent concentrations (in ppm) inferred from spectroscopic gamma radiation survey are higher in Malani rocks (Th 47.33 ppm and U 6.95 ppm) as compared to the Erinpura granites (Th 33.55 ppm and U 4.77 ppm). These values are considerably above the granite world average (Th \(14.8 \pm 13.2\) ppm; U \(3.93 \pm 3.27\) ppm). High U (up to 19 ppm) and Th (up to 88 ppm) in some Malani granites and a constant Th–U ratio of 7 points to a high degree of fractionation of the felsic magma. Higher radioelement concentration in the east (Mirpur granite) as compared to the west (Jaswantpura granite) is substantiated by geochemical data. Areas to the west and east of the Sirohi frontal thrust show differences, most likely a consequence of anatexis in the eastern sector. A high linear correlation between inductively coupled plasma mass spectrometry and gamma-ray data underlines the suitability of in-situ measurements for the determination of U and Th concentrations during a field survey providing basic information for future petrogenetic and risk-hazard studies in this granitic terrain.


Natural gamma radiation thorium uranium granitoids NW India 



We thank Marcel Regelous for the support with the geochemical measurements and Tom Brunclik of Georadis, Brno for the technical support with the gamma spectrometer and the hospitality during the trip to Brno in May 2018. We also thank Stefan Gleissner, Hendrik Raabe and Michel Bestmann for the support with the fieldwork in 2018, with the sample preparation and the assistance with some of the figures in this study. We also thank the two anonymous reviewers for their valuable comments and suggestions to improve the manuscript.

Supplementary material

12040_2019_1166_MOESM1_ESM.xlsx (56 kb)
Supplementary material 1 (xlsx 55 KB)


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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.GeoZentrum NordbayernFriedrich-Alexander Universität ErlangenGermany
  2. 2.Piewak & Partner GmbH BayreuthGermany
  3. 3.Department of GeologyGovernment Post-Graduate CollegeSirohiIndia

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