Geochemical evidence of seawater involvement in the metamorphism of Sergeevsky basites (Sikhote-Alin)

Research subject. The igneous rocks examined in this study were collected from outcrops located in the vicinity of Sergeevka and Vladimiro-Alexandrovskoye (Okrainsko-Sergeevsky terrane), as well as Kamenka (Kamensky allochthon), villages. The studied jaspers, manganese silicate rocks, and silicate-magnetite ores were sampled from outcrops within the Olginsky and Dalnegorsky ore regions (Taukha terrane) and the Malinovsky ore region (Samarka terrane). Aim. To clarify the geological events in the evolution of the Sikhote-Alin region that determined changes in the geochemical parameters of the Cambrian (?) basites of the Sergeevsky complex. To that end, the petrography, petrochemistry, and geochemistry of the metabasites of the Sergeevsky complex and metamorphosed Triassic metalliferous sediments were studied.  Methods. Gravimetry, inductively coupled plasma atomic emission spectrometry (ICP-AES), and inductively coupled plasma mass spectrometry (ICP-MS) were employed, the latter for the determination of trace and rare elements. The isotopic compositions of Nd, Pb, and Sr were also analyzed. Mineral identification was performed using optical microscopy and subsequently confirmed by compositional analysis with an X-ray spectral microanalyzer (JXA-8100). Results. Analytical data were obtained for metabasites and metaultrabasites of the Sergeevsky complex, including major and trace element compositions and Nd, Sr, and Pb isotopic ratios; their mineralogy and internal structures were also investigated. In addition, analytical data were acquired for jaspers (major and trace elements), as well as for manganese– silicate and silicate–magnetite rocks and ores (trace elements and Nd isotopic ratios) of the Triassic chert formation of the Sikhote-Alin. Conclusion. The obtained data indicate that metamorphic processes significantly influenced the geochemical characteristics of the metabasites. The integrated application of igneous and sedimentary geochemistry, in combination with chemostratigraphic analysis, made it possible to elucidate the systematic variation in paired parameters (¹⁴³Nd/¹⁴⁴Nd– Sm/Nd, ¹⁴³Nd/¹⁴⁴Nd–Y/Nb, and ¹⁴³Nd/¹⁴⁴Nd–Zr/Y) in the metabasites of the Sergeevsky complex, trending toward values characteristic of metalliferous sediments of the Triassic chert formation of Sikhote-Alin. This trend is interpreted as evidence for seawater involvement in metamorphic processes. The involvement of seawater, supported by Sr isotopic ratios in the altered rocks and regional geological data, suggests that diaphthoresis of the Sergeevsky basites occurred during Middle–Late Jurassic accretion.

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