Chrome-Diopside Megacryst-Bearing Lamprophyre from the Late Cretaceous Mundwara Alkaline Complex, NW India: Petrological and Geodynamic Implications

Authors

  • Abhinay Sharma
     EPMA Laboratory, Department of Geology, Centre of Advanced Study, Banaras Hindu University, Varanasi - 221 005
  • Deepak Kumar
     EPMA Laboratory, Department of Geology, Centre of Advanced Study, Banaras Hindu University, Varanasi - 221 005
  • Samarendra Sahoo
     EPMA Laboratory, Department of Geology, Centre of Advanced Study, Banaras Hindu University, Varanasi - 221 005
  • Dinesh Pandit
     EPMA Laboratory, Department of Geology, Centre of Advanced Study, Banaras Hindu University, Varanasi - 221 005
  • N. V. Chalapathi Rao
     EPMA Laboratory, Department of Geology, Centre of Advanced Study, Banaras Hindu University, Varanasi - 221 005

DOI:

https://doi.org/10.1007/s12594-018-0871-4

Abstract

The occurrence of a rare mantle-derived chrome-diopside megacryst (~8 mm), containing inclusions of olivine, in a lamprophyre dyke from the late Cretaceous polychronous (~100 - 68 Ma) Mundwara alkaline complex of NW India is reported. The olivine inclusions are forsteritic (Fo: 85.23) in composition, and their NiO (0.09 wt%) and CaO (0.13 wt%) contents imply derivation from a peridotitic mantle source. The composition of the chrome diopside (Cr2O3: 0.93 wt ) (Wo45.27 En48.47 Fs5.07 and Ac1.18) megacryst is comparable to that occurring in the garnet peridotite xenoliths found in diamondiferous kimberlites from Archaean cratons. Single pyroxene thermobarometry revealed that this chrome diopside megacryst was derived from a depth range of ~100 km, which is relatively much deeper than that of the chrome-diopside megacrysts (~40-50 km) reported in spinellherzolite xenoliths from the alkali basalts of Deccan age (ca. 66- 67 Ma) from the Kutch, NW India. This study highlights that pre- Deccan lithosphere, below the Mundwara alkaline complex, was at least ~100 km thick and, likely, similar in composition to that of the cratonic lithosphere.

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Issue

Volume 91, Issue 4, April 2018 Pages (389-516)

Section

Research Articles

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Published

2018-04-01

How to Cite

Sharma, A., Kumar, D., Sahoo, S., Pandit, D., & Chalapathi Rao, N. V. (2018). Chrome-Diopside Megacryst-Bearing Lamprophyre from the Late Cretaceous Mundwara Alkaline Complex, NW India: Petrological and Geodynamic Implications. Journal of Geological Society of India, 91(4), 395–399. https://doi.org/10.1007/s12594-018-0871-4
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