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The occurrence of fluor-wagnerite in UHT granulites and its implications towards understanding fluid regimes in the evolution of deep crust: a case study from the Eastern Ghats Belt, India

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Abstract

We report the occurrence of a rare phosphate mineral, fluor-wagnerite (Mg1.91–1.94Fe0.06–0.07Ca<0.01) (P0.99–1.00O4)(OH0.02–0.17F0.98–0.83) from the Eastern Ghats Belt of India, an orogenic belt evolved during Meso- to Neoproterozoic time. The host rock, i.e. high- to ultrahigh temperature (UHT) granulites (~1000 °C, 8–9 kbar) of the studied area was retrogressed after emplacement to mid-crustal level (800–850 °C, 6–6.5 kbar) as deduced from their pressure-temperature histories. Based on mineral chemical data and micro-Raman analyses, we document an unusual high Mg-F-rich chemistry of the F-wagnerite, which occur both in peak metamorphic porphyroblastic assemblages as well as in the retrograde matrix assemblage. Therefore, in absence of other common phosphates like apatite, fluor-wagnerite can act as an indicator for the presence of F-bearing fluids for rocks with high X Mg and/or fO2. The occurrence of F-rich minerals as monitors for fluid compositions has important implications for the onset of biotite dehydration melting and hence melt production in the deep crust. We propose that fluor-wagnerite can occur as an accessory mineral associated with F-rich fluids in lower-mid crustal rocks, and F in coexisting minerals should be taken into consideration when reconciling the petrogenetic grid of biotite-dehydration melting.

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Acknowledgments

We thank M. Kanzaki for his generous assistance with the Raman spectroscopy at the Institute for Study of the Earth’s Interior, Misasa, Japan. We thank Yasuhiro Shibata for assisting in EPMA analysis. We thank Dirk Spengler, Tetsuo Kawakami and Silvio Ferrero for their insightful comments on an earlier version of the manuscript that certainly helped to improve the quality of the paper. Helpful comments and suggestions from Peter Tropper, Simon Harley and one anonymous reviewer significantly improved the manuscript quality. Efficient editorial handing by Lutz Nasdala is greatly appreciated. This work is partially supported by the Visiting Scientist program at ISEI, Okayama University for KD. Partial funding for this research was provided by CSIR, Govt. of India, via grant 24(0333)/14-EMR II to SB.

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Authors and Affiliations

  1. Department of Earth and Planetary Systems Science, Hiroshima University, Higashi Hiroshima, Japan

    Kaushik Das & Jun-ichi Ando

  2. Institute for Study of the Earth’s Interior, Okayama University, Okayama, Japan

    Kaushik Das & Naotaka Tomioka

  3. Department of Geology, Presidency University, Kolkata, India

    Sankar Bose

  4. JEOL Ltd., Tokyo, Japan

    Ichiro Ohnishi

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  1. Kaushik Das
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  2. Naotaka Tomioka
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Correspondence to Kaushik Das.

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Das, K., Tomioka, N., Bose, S. et al. The occurrence of fluor-wagnerite in UHT granulites and its implications towards understanding fluid regimes in the evolution of deep crust: a case study from the Eastern Ghats Belt, India. Miner Petrol 111, 417–429 (2017). https://doi.org/10.1007/s00710-016-0474-y

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