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

Published online by Cambridge University Press:  05 July 2018

L. Melluso ,
R. K. Srivastava ,
C. M. Petrone ,
V. Guarino  and
A. K. Sinha
L. Melluso*
Affiliation:
Dipartimento di Scienze della Terra, Universitá di Napoli Federico II, Napoli, Italy
R. K. Srivastava
Affiliation:
Department of Geology, Banaras Hindu University, Varanasi, India
C. M. Petrone
Affiliation:
Department of Earth Sciences, Cambridge University, Cambridge, UK
V. Guarino
Affiliation:
Dipartimento di Scienze della Terra, Universitá di Napoli Federico II, Napoli, Italy
A. K. Sinha
Affiliation:
Department of Geology, Banaras Hindu University, Varanasi, India
*
*E-mail: melluso@unina.it
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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.

Keywords

clinopyroxenitesgabbrossyenitesperovskitetitaniteamphibolepotassic rocksJasra intrusionIndia
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 5 , October 2012 , pp. 1099 - 1117
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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Footnotes

‡

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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Supplementary material: File

Melluso et al. supplementary material

Supplementary Table 1: bulk-rock, CIPW norms and isotopic data

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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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Supplementary Table 3: olivine compositions

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Supplementary Table 4: clinopyroxene compositions

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Supplementary Table 5: amphibole and phlogopite compositions

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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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Supplementary material: Image

Melluso et al. supplementary material

Supplementary figures: thin section photomicrographs of the Jasra samples 1

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