Significance of mineral chemistry of syenites and associated rocks of Elagiri complex,Southern Granulite Terrane of the Indian shield |
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| Authors: | Sarmistha Mukhopadhyay Jyotisankar Ray Basab Chattopadhyay Shyamal Sengupta Biswajit Ghosh Subrata Mukhopadhyay |
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| Institution: | (1) Institut für Geowissenschaften, AB Mineralogie und Geodynamik, Universität Tübingen, Wilhelmstrasse 56, 72074 Tübingen, Germany;(2) Gmain 1, 84424 Isen, Germany |
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| Abstract: | The Elagiri complex (12°31′ N: 78°35′ E) represents one of the important silica — oversaturated syenite plutons of the Southern
Granulite Terrane of the Indian shield. This article for the first time reports the mineral chemistry of the Elagiri complex
and brings out important petrogenetic significance. The litho-members of Elagiri complex are intrusive into high grade country
rocks viz. granite gneiss, amphibolite and pyroxene granulite. The country rocks are foliated bearing evidences of multiple
folding and deformation. On the other hand, the constituent litho members of the Elagiri complex (syenites, gabbro and later
intrusives marked by lamprophyre and carbonatite) show preservation of igneous layering in terms of discernible parallelism
of the constituent minerals. The Elagiri complex shows presence of sharp contacts among litho members and marked absence of
chilled facies peripheral to the margin. Electron microprobe data have been critically used to systematize the constituent
mineral-phases of the different lithomembers of the complex. Geothermobarometric data indicate a temperature of equilibration
in the range of ∼700° to 500°C at ∼2.0 to 5.2 kb which corresponds to shallow level (cf. 18.2 km) equilibration-depth of the
complex. Field observations and mineral chemistry data suggest that liquid immiscibility plays an important role during the
evolution of the Elagiri complex. |
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