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Abstract <p>Rare Zr garnets, kimzeyite {Ca<sub>3</sub>}[Zr<sub>2</sub>](SiAl<sub>2</sub>)O<sub>12</sub> and kerimasite {Ca<sub>3</sub>}[Zr<sub>2</sub>](<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\text{SiFe}}_{2}^{{3 + }}\)</EquationSource> <!--EarthSci2660080Oparin-m1--> </InlineEquation>)O<sub>12</sub>, are found for the first time in kimberlites of the Siberian Platform, in the Manchary pipe (Khompu-Mayskoe field, Central Yakutia). The garnets occur as small zoned crystals and their intergrowths in serpentine mesostasis of kimberlites of the Manchary pipe in assemblage with calzirtite, calcite, perovskite, spinel group minerals, apatite, and phlogopite. The crystal cores could be both homogeneous and zoned. The homogeneous cores correspond to kerimasite. The zoned cores are characterized by the kerimasite/kimzeyite → Zr-rich schorlomite → andradite zonation reflecting a decrease in a Zr content from the center to the rim. The crystallization of Zr-bearing garnets in the Manchary pipe is related to local Zr enrichment of a late magmatic residual melt under general evolution of the kimberlite melt to SiO<sub>2</sub>-depleted carbonate-rich melts. Most likely, Zr could be sourced from kimberlite melts (the average Zr content of kimberlites reaches 890 ppm). The outer zone corresponds to andraditic hydrogarnet as confirmed by Raman spectroscopy. The findings of rare Zr-bearing garnet crystals may indicate calcite kimberlites in the source and should be taken into account during prospecting and exploration within the Yakutian diamondiferous province.</p>

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First Finding of Zr-Bearing Garnets in Kimberlites of the Manchary Pipe (Khompu-Mayskoe Kimberlite Field, Central Yakutia)

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • N. A. Oparin,
  • A. V. Korsakov,
  • O. B. Oleinikov,
  • N. P. Pokhilenko,
  • A. Ya. Biller

摘要

Abstract

Rare Zr garnets, kimzeyite {Ca3}[Zr2](SiAl2)O12 and kerimasite {Ca3}[Zr2]( \({\text{SiFe}}_{2}^{{3 + }}\) )O12, are found for the first time in kimberlites of the Siberian Platform, in the Manchary pipe (Khompu-Mayskoe field, Central Yakutia). The garnets occur as small zoned crystals and their intergrowths in serpentine mesostasis of kimberlites of the Manchary pipe in assemblage with calzirtite, calcite, perovskite, spinel group minerals, apatite, and phlogopite. The crystal cores could be both homogeneous and zoned. The homogeneous cores correspond to kerimasite. The zoned cores are characterized by the kerimasite/kimzeyite → Zr-rich schorlomite → andradite zonation reflecting a decrease in a Zr content from the center to the rim. The crystallization of Zr-bearing garnets in the Manchary pipe is related to local Zr enrichment of a late magmatic residual melt under general evolution of the kimberlite melt to SiO2-depleted carbonate-rich melts. Most likely, Zr could be sourced from kimberlite melts (the average Zr content of kimberlites reaches 890 ppm). The outer zone corresponds to andraditic hydrogarnet as confirmed by Raman spectroscopy. The findings of rare Zr-bearing garnet crystals may indicate calcite kimberlites in the source and should be taken into account during prospecting and exploration within the Yakutian diamondiferous province.