Spinel chemistry from Madawara Mafic-Ultramafic Complex, Lalitpur District, Uttar Pradesh, India

Authors

  • H. Thomas Department of Applied Geology, School of Engineering and Technology Dr. Harisingh Gour Vishwavidyalaya, Sagar
  • C. B. Verma NMDC Limited, Resource Planning Department, 10-3-311/A, Khanij Bhavan, Masab Tank, 13 Hyderabad
  • Anjali Jain Department of Applied Geology, School of Engineering and Technology Dr. Harisingh Gour Vishwavidyalaya, Sagar
  • Lukas Ackerman Institute of Geology v.v.i., Academy of Sciences of the Czech Republic, Prague, Czech Republic

DOI:

https://doi.org/10.3126/jngs.v58i0.24573

Keywords:

Spinel, MMUMC, Madawara, Mineral chemistry, Peridotites

Abstract

Spinel in peridotite of the Pipariya area in Madawara Mafic and Ultramafic Complex (MMUMC) occur as euhedral to subhedral inclusion within the silicates. They exhibit regular to irregular shape and is altered to ferritchromite to magnetite along the cracks and boundaries. Cr-spinel is characterised by high values of Cr# (79.7-98.4) and low Mg# and Al# values (i.e., 20.41-9.66 and 0.49- 17.71, respectively) and are identified as Fe-chromite. Chemical discontinuity/zones between the core and rim can be observed in the analysed grain. The textural and chemical features of investigated suggest low- to sub greenschist facies metamorphism consistent with the estimated metamorphic equilibrium temperature of 500°C-550°C.

Mineral chemistry of these spinel suggests that spinel in peridotite of Pipariya in the Madawara Mafic and Ultramafic Complex depicts that these Cr-spinel may have been derived from boninitic related magmas at arc to suprasubduction zone tectonic setting at low degree of partial melting. 

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Published

2019-06-24

How to Cite

Thomas, H., Verma, C. B., Jain, A., & Ackerman, L. (2019). Spinel chemistry from Madawara Mafic-Ultramafic Complex, Lalitpur District, Uttar Pradesh, India. Journal of Nepal Geological Society, 58, 53–59. https://doi.org/10.3126/jngs.v58i0.24573

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