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REE mineral chemistry and the nature of REE mineralization: A study from felsite dykes of Phulan area, Siwana Ring Complex, Rajasthan, India

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Neo-Proterozoic Siwana Ring Complex (SRC) comprises per alkaline rocks of Malani Igneous Suite, viz., rhyolite, granite, and late phase microgranite and felsite dykes. Phulan area, lying at the northeastern margin of SRC exposes a small body of rhyolite (<1.0 km2) containing feldspar + quartz + aegirine + rebeckite and is cut by dykes of felsite. These felsite dykes have a general NNW–SSE trend and vary from 60–200 m long and 0.10–2.50 m wide. These dykes are composed of quartz, alkali feldspar, aegirine and opaques. These felsite dykes were sampled and analyzed using inductively coupled plasma methods. Of special significance is the enrichment of trace elements and rare earth elements (REE) in the felsite dykes. These include up to 1.17% Ce, 0.6% La, 0.8% Y, 0.12% Dy, 169.25 ppm U, 571 ppm Th, 1385 ppm Nb, 9944 ppm Zr. These dykes are peralkaline in nature and show negative europium (Eu) anomaly. In this study, the authors attempted to characterize REE bearing phases of the felsite dykes of Phulan area, SRC with respect to their geneiss. REE bearing phases identified in felsite dykes are monazite, bastnaesite, parisite, eudiyalite, allanite, perreierite and tritomite. Monazite, perreierite, allanite and tritomite are mostly found to be of magmatic in origin whereas bastnaesite, parasite and eudiyalytes occur both as magmatic and as well as of hydrothermal types. Magmatic REE minerals are mostly formed during crystallization of REE rich magma. In felsite dykes, Zr/Hf ratio varies from 23 to 31 and Nd/Ta ratio ranges from 7 to 44. These two ratios are positively correlated and indicators of hydrothermal fluid influx.

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The authors express their gratitude to Shri. Brij Kumar, Additional Director General and HOD for giving permission and continuous encouragement for publishing the article. The authors also express their profound gratefulness to Dr N P Nathan, Deputy Director General (Retd.) and Dr Shabbir Hussain, Deputy Director General (Retd.) for their close supervision, continuous encouragement and valuable suggestions during the project. Authors also thank the anonymous reviewer for his valuable suggestions to improve the manuscript. UKD and AG also thank all the officers of Regional Chemical Laboratory, GSI, Jaipur and EPMA Laboratory, Faridabad for their expertise and guidance during analysis process.

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Correspondence to Arindam Gantait.

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Communicated by N V Chalapathi Rao

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Das, U.K., Gantait, A. REE mineral chemistry and the nature of REE mineralization: A study from felsite dykes of Phulan area, Siwana Ring Complex, Rajasthan, India. J Earth Syst Sci 129, 72 (2020).

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  • Siwana Ring Complex
  • rare earth element
  • monazite
  • bastenesite
  • parisite
  • eudiyalite
  • allanite
  • perreierite
  • tritomite
  • magmatic
  • hydrothermal