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<p>The Elchuru alkaline complex in the Prakasam Alkaline Province (PAP), Eastern Ghats Belt, SE India, was intruded by coeval shonkinite dykes during ca. 1350&#xa0;Ma continental rift-related magmatism. The shonkinite dykes have fine-to-medium-grained porphyritic to equigranular textures with clinopyroxene, biotite, amphibole, K-feldspar perthite, nepheline, and plagioclase as major mineral phases. Based on mineral-melt chemical disequilibrium and P-T estimates of mineral crystallization, we propose that multiple magma reservoirs existed at various crustal depths. The crystallization sequence of clinopyroxene-biotite-amphibole correlates with mineral saturation under diverse P-T conditions. Magmas parental to the shonkinite dykes experienced transcrustal differentiation at ~ 12 kbar and ~ 1160℃ (during dominantly clinopyroxene fractionation), ~ 6 kbar and ~ 830℃ (during biotite fractionation), and ~ 3 kbar and ~ 810℃ (during amphibole, K-feldspar, nepheline, and plagioclase fractionation). The depths of magma reservoirs, the “plumbing” system of the shonkinite dykes were ~ 35&#xa0;km (deeper), ~ 20&#xa0;km (intermediate) and ~ 10&#xa0;km (shallower). The transcrustal plumbing system of magma was in an active continental rift setting.</p>

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Transcrustal magmatic plumbing system of alkaline magmas: insights from the shonkinite dykes from Elchuru alkaline complex, Eastern Ghats Belt, India

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • Chinnam Naidu M,
  • Sachin S. Ghodke,
  • Gaurav J. Kokandakar,
  • B. Nagaraju,
  • Laxman B. More,
  • Munjaji V. Bhosle,
  • K. Rathna,
  • K. Vijaya Kumar

摘要

The Elchuru alkaline complex in the Prakasam Alkaline Province (PAP), Eastern Ghats Belt, SE India, was intruded by coeval shonkinite dykes during ca. 1350 Ma continental rift-related magmatism. The shonkinite dykes have fine-to-medium-grained porphyritic to equigranular textures with clinopyroxene, biotite, amphibole, K-feldspar perthite, nepheline, and plagioclase as major mineral phases. Based on mineral-melt chemical disequilibrium and P-T estimates of mineral crystallization, we propose that multiple magma reservoirs existed at various crustal depths. The crystallization sequence of clinopyroxene-biotite-amphibole correlates with mineral saturation under diverse P-T conditions. Magmas parental to the shonkinite dykes experienced transcrustal differentiation at ~ 12 kbar and ~ 1160℃ (during dominantly clinopyroxene fractionation), ~ 6 kbar and ~ 830℃ (during biotite fractionation), and ~ 3 kbar and ~ 810℃ (during amphibole, K-feldspar, nepheline, and plagioclase fractionation). The depths of magma reservoirs, the “plumbing” system of the shonkinite dykes were ~ 35 km (deeper), ~ 20 km (intermediate) and ~ 10 km (shallower). The transcrustal plumbing system of magma was in an active continental rift setting.