Comprehensive dataset for the Hujialin ultramafic body in the Sulu orogen: Mineral proportions, whole-rock geochemistry, Sr-Nd-O isotopes, mineral chemistry, and melt/cumulate modeling

This dataset presents a comprehensive geochemical and petrological record for the Hujialin ultramafic body in the Sulu orogenic belt, a major ultrahigh-pressure terrane in eastern China. The data compilation includes mineral proportions (Table S1), whole-rock major and trace element compositions (Table S2), whole-rock Sr–Nd isotopic ratios (Table S3), major and trace element compositions of olivine (Table S4), spinel (Table S5), garnet (Table S6), and clinopyroxene (Table S7), oxygen isotope compositions of whole-rock and mineral separates (Table S8), and modeled melt–cumulate compositions using the MELTS algorithm (Table S9). The dataset integrates newly acquired analyses with previously published data for several garnet-rich clinopyroxenites, allowing a unified comparison across the Hujialin ultramafic suite.
This study was supported by funds from National Key Research and Development Program of China (2024YFF0807300) and the Fundamental and Interdisciplinary Disciplines Breakthrough Plan of the Ministry of Education of China (JYB2025XDXM911).

Whole-rock major elements were determined by X-ray fluorescence (XRF), and trace elements by solution ICP-MS (Agilent 7700e) with HF–HNO₃ digestion; analytical precision (1σ) is within ±5% for most elements, and accuracy was validated against standards AGV-2, BHVO-2, and RGM-2. Sr–Nd isotopes were measured by MC-ICP-MS (Thermo Fisher Neptune Plus) after column separation, yielding ¹⁴³Nd/¹⁴⁴Nd ratios of 0.511363±10 for GSP-2 and 0.512964±10 for BHVO-2, and ⁸⁷Sr/⁸⁶Sr ratios of 0.765018±13 and 0.703490±12, respectively, in agreement with recommended values. Mineral major elements were analyzed by EPMA (Shimadzu EPMA-1600 and JEOL JXA-8230) with precision better than ±1%, and in situ trace elements by LA-ICP-MS (GeoLas 2005 + Agilent 7500a) with typical precision within ±10%. Oxygen isotopes (δ¹⁸O) were determined by laser fluorination (Finnigan Delta XP) with long-term reproducibility better than ±0.1‰ (1σ), normalized to VSMOW and validated using 04BXL07 garnet (3.7‰) and San Carlos olivine (5.3‰).
This integrated dataset provides a robust basis for investigating mantle wedge processes, crust–mantle interaction, and fluid/melt metasomatism in continental subduction zones. It is particularly suited for testing petrogenetic models of ultramafic rocks via mineral-melt equilibrium calculations and thermodynamic simulations (e.g., MELTS), and for comparative studies with other ultramafic bodies in the Sulu–Dabie orogenic belt.