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Mineralogy and magmatic affinity of the Jasra intrusive complex, Shillong Plateau, India

  • L. Melluso (a1), R. K. Srivastava (a2), C. M. Petrone (a3), V. Guarino (a1) and A. K. Sinha (a2)...

Abstract

The rocks of the Jasra intrusive complex (Shillong Plateau, northeastern India) include phlogopite clinopyroxenites (with olivine or perovskite relics), alkali gabbros/monzodiorites, syenites and nepheline syenites. They have a potassic affinity (Na2O/K2O ∼1), and their mineralogy is dominated by clinopyroxene with which phlogopite, olivine, amphibole, feldspars, feldspathoids, oxides, orthopyroxenes, perovskite, titanite and other accessory phases are variably associated. The Jasra intrusive rocks are cumulates derived from at least two distinct magmatic liquids. The potassic affinity of the Jasra rocks differs from the nearby Sung Valley ijolitic-carbonatitic complex and from the ultrapotassic lamproitic rocks of the Damodar Valley, which are of approximately the same age. This suggests major variability in the mantle sources of small-volume alkaline volcanism in the Early Cretaceous of northeastern India.

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Corresponding author

*E-mail: melluso@unina.it

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Present address: Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK

Present address: Dr K.S. Krishnan Geomagnetic Research Laboratory, Jhusi, Allahabad 211505, India

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References

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EXCEL
Supplementary materials

Melluso et al. supplementary material
Supplementary Table 1: bulk-rock, CIPW norms and isotopic data

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Supplementary materials

Melluso et al. supplementary material
Supplementary figures: thin section photomicrographs of the Jasra samples 2

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Melluso et al. supplementary material
Supplementary Table 2: oxide compositions

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Melluso et al. supplementary material
Supplementary Table 3: olivine compositions

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Supplementary Table 4: clinopyroxene compositions

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Melluso et al. supplementary material
Supplementary Table 5: amphibole and phlogopite compositions

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Melluso et al. supplementary material
Supplementary Table 6: feldspar and nepheline compositions

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Melluso et al. supplementary material
Supplementary Table 7: composition of apatite, titanite and garnet

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Melluso et al. supplementary material
Supplementary Table 8: composition of perovskite and zirconolite

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Melluso et al. supplementary material
Supplementary figures: thin section photomicrographs of the Jasra samples 1

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1.3 MB

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