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<p>The EPMA and LA–ICP–MS data on clinopyroxene from the gabbroic intrusive from the Western Iron Ore Group Basin (N22°14.25′:E085°24.10′), Singhbhum Craton, Eastern India was used to assess the petrogenetic history. The clinopyroxene belongs to the ‘QUAD’ group as per the Q–J relation and typically signifies an ‘augitic nature’ in the Wo–En–Fs triangle. Al<sup>VI</sup> <i>vs.</i> Al<sup>IV</sup> relation points to an ‘igneous rock suite with low-pressure equilibration history,’ which is also supported by the petrography. Several inter-element variation diagrams suggest the entry of different cations into preferred sites of clinopyroxene (in response to varying temperature–pressure milieu), often involving coupled substitution. Clinopyroxene chemistry typically points towards a subalkaline/tholeiitic parental magma character. Chondrite-normalized REE patterns for clinopyroxene exhibit relatively less LREE enrichment with a moderately high HREE pattern and pronounced negative Eu anomaly. The primitive-mantle normalized multi-element diagram depicts a clear depletion of Nb, Ta, Sr, Zr, and Ti, as well as an almost flat or uniformly enriched HREE pattern. The trace element behaviours of clinopyroxene are attributable to later fluid invasion in the magma, which is also supported by textural evidence. The chemistry of investigated clinopyroxene indicates that the parent basic magma had a ‘subduction-related arc affinity’ in a fluid-induced environment.</p>

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Importance of clinopyroxene mineral chemistry as a potential petrogenetic indicator: A case study from gabbroic intrusives from Western Iron Ore Group, Singhbhum Craton, Eastern India

  • 期刊论文

  • 发表日期：

    2025年4月17日

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  • Madhuparna Paul,
  • Biswajit Ghosh,
  • Tomoaki Morishita,
  • Akihiro Tamura,
  • Jyotisankar Ray,
  • C Manikyamba,
  • Suresh C Patel

摘要

The EPMA and LA–ICP–MS data on clinopyroxene from the gabbroic intrusive from the Western Iron Ore Group Basin (N22°14.25′:E085°24.10′), Singhbhum Craton, Eastern India was used to assess the petrogenetic history. The clinopyroxene belongs to the ‘QUAD’ group as per the Q–J relation and typically signifies an ‘augitic nature’ in the Wo–En–Fs triangle. AlVI vs. AlIV relation points to an ‘igneous rock suite with low-pressure equilibration history,’ which is also supported by the petrography. Several inter-element variation diagrams suggest the entry of different cations into preferred sites of clinopyroxene (in response to varying temperature–pressure milieu), often involving coupled substitution. Clinopyroxene chemistry typically points towards a subalkaline/tholeiitic parental magma character. Chondrite-normalized REE patterns for clinopyroxene exhibit relatively less LREE enrichment with a moderately high HREE pattern and pronounced negative Eu anomaly. The primitive-mantle normalized multi-element diagram depicts a clear depletion of Nb, Ta, Sr, Zr, and Ti, as well as an almost flat or uniformly enriched HREE pattern. The trace element behaviours of clinopyroxene are attributable to later fluid invasion in the magma, which is also supported by textural evidence. The chemistry of investigated clinopyroxene indicates that the parent basic magma had a ‘subduction-related arc affinity’ in a fluid-induced environment.