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Abstract <p>Clinopyroxenites and wehrlites of the ophiolite complex of the Kamchatsky Mys Peninsula have been studied. Petro- and geochemical characteristics of the rocks were obtained and compositions of olivines, clinopyroxenes and chrome-spinels were determined. Contents of platinum group elements (PGEs) and rhenium in olivine-clinopyroxenite were analyzed. The obtained characteristics of clinopyroxenites and wehrlites of the Kamchatsky Mys Peninsula were compared with similar rocks in different complexes from other regions. Among the published data, none complex correspond the Kamchatsky Mys rocks in all the parameters. The rocks have a cumulative nature and were formed within the transitional (layered) part of the ophiolite complex. The composition of minerals from the Kamchatsky Mys rocks shows extended continuous trends, often overlapping the fields of oceanic and suprasubduction settings. The trace-element distribution in clinopyroxenites indicates an LREE-depleted N-MORB type mantle source. The high contents of Rh (1.04 ppb), Pt (13.4 ppb), and Pd (34.4 ppb) with Pd predominance and the low contents of Os (0.086 ppb), Ir (2.26 ppb) and Ru (0.24 ppb) in the clinopyroxenite indicate the fractional crystallization of the parent magma. According to the sum of the characteristics, the composition of the cumulative rocks of the Cretaceous ophiolite complex of the Kamchatsky Mys peninsula confirms the attribution of this complex to P-type (plume type) ophiolites.</p>

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Cumulative Ultramafic Rocks in Ophiolites of the Kamchatsky Mys Peninsula: Geological Position according to Geochemical, Mineralogical and PGE Data

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • R. I. Cherkashin,
  • D. P. Savelyev,
  • E. V. Pushkarev,
  • V. D. Shcherbakov,
  • S. V. Moskaleva

摘要

Abstract

Clinopyroxenites and wehrlites of the ophiolite complex of the Kamchatsky Mys Peninsula have been studied. Petro- and geochemical characteristics of the rocks were obtained and compositions of olivines, clinopyroxenes and chrome-spinels were determined. Contents of platinum group elements (PGEs) and rhenium in olivine-clinopyroxenite were analyzed. The obtained characteristics of clinopyroxenites and wehrlites of the Kamchatsky Mys Peninsula were compared with similar rocks in different complexes from other regions. Among the published data, none complex correspond the Kamchatsky Mys rocks in all the parameters. The rocks have a cumulative nature and were formed within the transitional (layered) part of the ophiolite complex. The composition of minerals from the Kamchatsky Mys rocks shows extended continuous trends, often overlapping the fields of oceanic and suprasubduction settings. The trace-element distribution in clinopyroxenites indicates an LREE-depleted N-MORB type mantle source. The high contents of Rh (1.04 ppb), Pt (13.4 ppb), and Pd (34.4 ppb) with Pd predominance and the low contents of Os (0.086 ppb), Ir (2.26 ppb) and Ru (0.24 ppb) in the clinopyroxenite indicate the fractional crystallization of the parent magma. According to the sum of the characteristics, the composition of the cumulative rocks of the Cretaceous ophiolite complex of the Kamchatsky Mys peninsula confirms the attribution of this complex to P-type (plume type) ophiolites.