Cu abundance in arc magmas is an important factor controlling the formation of porphyry Cu deposits. Globally, primitive arc basaltic magmas contain elevated Cu concentrations, which gradually decrease with magma differentiation. It is widely believed that this variation is due to sulfide saturation in magmas. The sulfides extracted the Cu and removed from the magma. However, our study found that the same gradual decrease in Cu content with magma differentiation occurs in sulfide-unsaturated arc magmas. The initial arc magmatism generated by the Neo-Tethyan subduction is characterized by water-rich and oxidized features and early aqueous volatile exsolution during magmatic differentiation. These exsolved fluids dissolve the S in the magma, resulting in a reduction in S content and inhibiting sulfide saturation. As elements such as Cu could also move into the fluids, the Cu content gradually decreases in the magma. These exsolved fluids, which contain elevated metal, also become a potential source for the formation of porphyry Cu-Au deposits.

Cu abundance in arc magmas is an important factor controlling the formation of porphyry Cu deposits. Globally, primitive arc basaltic magmas contain elevated Cu concentrations, which gradually decrease with magma differentiation. It is widely believed that this variation is due to sulfide saturation in magmas. The sulfides extracted the Cu and removed from the magma. However, our study found that the same gradual decrease in Cu content with magma differentiation occurs in sulfide-unsaturated arc magmas. The initial arc magmatism generated by the Neo-Tethyan subduction is characterized by water-rich and oxidized features and early aqueous volatile exsolution during magmatic differentiation. These exsolved fluids dissolve the S in the magma, resulting in a reduction in S content and inhibiting sulfide saturation. As elements such as Cu could also move into the fluids, the Cu content gradually decreases in the magma. These exsolved fluids, which contain elevated metal, also become a potential source for the formation of porphyry Cu-Au deposits.

Cu abundance in arc magmas is an important factor controlling the formation of porphyry Cu deposits. Globally, primitive arc basaltic magmas contain elevated Cu concentrations, which gradually decrease with magma differentiation. It is widely believed that this variation is due to sulfide saturation in magmas. The sulfides extracted the Cu and removed from the magma. However, our study found that the same gradual decrease in Cu content with magma differentiation occurs in sulfide-unsaturated arc magmas. The initial arc magmatism generated by the Neo-Tethyan subduction is characterized by water-rich and oxidized features and early aqueous volatile exsolution during magmatic differentiation. These exsolved fluids dissolve the S in the magma, resulting in a reduction in S content and inhibiting sulfide saturation. As elements such as Cu could also move into the fluids, the Cu content gradually decreases in the magma. These exsolved fluids, which contain elevated metal, also become a potential source for the formation of porphyry Cu-Au deposits.

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The table includes whole-rock major, trace, PGE, and Re-Os isotope data of mantle peridotites (harzburgites and lherzolites) in the Shuanggou ophiolite, and clinopyroxene compositions in the lherzolites. Whole-rock major elements were analyzed using X-ray fluorescence (XRF) with <5% at the Australian Laboratory Services P/L. Trace element compositions were measured using an inductively coupled plasma mass spectrometry (ICP-MS) at the State Key Laboratory of Ore Deposit Geochemistry, Chinese Academy of Sciences (SKLODG), following the procedure of Qi et al. (2000). In-situ analysis of clinopyroxenes in the lherzolites was analyzed by an Agilent 7900× ICP-MS (LA-ICP-MS) coupled with Coherent GeoLasPro 193-nm Laser Ablation system at the SKLODG following the experimental conditions and procedures from Liu et al. (2008). Whole-rock PGE data are measured an isotope dilution (ID)–ICP–MS at the SKLODG following the procedure of Qi et al. (2011). Whole-rock Re-Os isotope data are measured by a Isoprobe-T Mass Spectrometer and a Neptune multicollector (MC)-ICP-MS at the State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, following the method of Chu et al (2009). ReferenceChu, Z.Y., Wu, F.Y., Walker, R.J., Rudnick, R.L., Pitcher, L., Puchtel, I.S., Yang, Y.H., & Wilde, S.A. (2009). Temporal evolution of the lithospheric mantle beneath the eastern North China Craton. Journal of Petrology, 50, 1857-1898.Liu, Y., Hu, Z., Gao, S., Günther, D., Xu, J., Gao, C., & Chen, H. (2008). In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard. Chemical Geology, 257(1-2), 34-43.Qi, L., Gao, J., Huang, X., Hu, J., Zhou, M. F., & Zhong, H. (2011). An improved digestion technique for determination of platinum group elements in geological samples. Journal of Analytical Atomic Spectrometry, 26(9), 1900-1904.Qi, L., Hu, J., & Gregoire, D. C. (2000). Determination of trace elements in granites by inductively coupled plasma mass spectrometry. Talanta, 51(3), 507-513.

The table includes whole-rock major, trace, PGE, and Re-Os isotope data of mantle peridotites (harzburgites and lherzolites) in the Shuanggou ophiolite, and clinopyroxene compositions in the lherzolites. Whole-rock major elements were analyzed using X-ray fluorescence (XRF) with <5% at the Australian Laboratory Services P/L. Trace element compositions were measured using an inductively coupled plasma mass spectrometry (ICP-MS) at the State Key Laboratory of Ore Deposit Geochemistry, Chinese Academy of Sciences (SKLODG), following the procedure of Qi et al. (2000). In-situ analysis of clinopyroxenes in the lherzolites was analyzed by an Agilent 7900× ICP-MS (LA-ICP-MS) coupled with Coherent GeoLasPro 193-nm Laser Ablation system at the SKLODG following the experimental conditions and procedures from Liu et al. (2008). Whole-rock PGE data are measured an isotope dilution (ID)–ICP–MS at the SKLODG following the procedure of Qi et al. (2011). Whole-rock Re-Os isotope data are measured by a Isoprobe-T Mass Spectrometer and a Neptune multicollector (MC)-ICP-MS at the State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, following the method of Chu et al (2009). ReferenceChu, Z.Y., Wu, F.Y., Walker, R.J., Rudnick, R.L., Pitcher, L., Puchtel, I.S., Yang, Y.H., & Wilde, S.A. (2009). Temporal evolution of the lithospheric mantle beneath the eastern North China Craton. Journal of Petrology, 50, 1857-1898.Liu, Y., Hu, Z., Gao, S., Günther, D., Xu, J., Gao, C., & Chen, H. (2008). In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard. Chemical Geology, 257(1-2), 34-43.Qi, L., Gao, J., Huang, X., Hu, J., Zhou, M. F., & Zhong, H. (2011). An improved digestion technique for determination of platinum group elements in geological samples. Journal of Analytical Atomic Spectrometry, 26(9), 1900-1904.Qi, L., Hu, J., & Gregoire, D. C. (2000). Determination of trace elements in granites by inductively coupled plasma mass spectrometry. Talanta, 51(3), 507-513.

The table includes whole-rock major, trace, PGE, and Re-Os isotope data of mantle peridotites (harzburgites and lherzolites) in the Shuanggou ophiolite, and clinopyroxene compositions in the lherzolites. Whole-rock major elements were analyzed using X-ray fluorescence (XRF) with <5% at the Australian Laboratory Services P/L. Trace element compositions were measured using an inductively coupled plasma mass spectrometry (ICP-MS) at the State Key Laboratory of Ore Deposit Geochemistry, Chinese Academy of Sciences (SKLODG), following the procedure of Qi et al. (2000). In-situ analysis of clinopyroxenes in the lherzolites was analyzed by an Agilent 7900× ICP-MS (LA-ICP-MS) coupled with Coherent GeoLasPro 193-nm Laser Ablation system at the SKLODG following the experimental conditions and procedures from Liu et al. (2008). Whole-rock PGE data are measured an isotope dilution (ID)–ICP–MS at the SKLODG following the procedure of Qi et al. (2011). Whole-rock Re-Os isotope data are measured by a Isoprobe-T Mass Spectrometer and a Neptune multicollector (MC)-ICP-MS at the State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, following the method of Chu et al (2009). ReferenceChu, Z.Y., Wu, F.Y., Walker, R.J., Rudnick, R.L., Pitcher, L., Puchtel, I.S., Yang, Y.H., & Wilde, S.A. (2009). Temporal evolution of the lithospheric mantle beneath the eastern North China Craton. Journal of Petrology, 50, 1857-1898.Liu, Y., Hu, Z., Gao, S., Günther, D., Xu, J., Gao, C., & Chen, H. (2008). In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard. Chemical Geology, 257(1-2), 34-43.Qi, L., Gao, J., Huang, X., Hu, J., Zhou, M. F., & Zhong, H. (2011). An improved digestion technique for determination of platinum group elements in geological samples. Journal of Analytical Atomic Spectrometry, 26(9), 1900-1904.Qi, L., Hu, J., & Gregoire, D. C. (2000). Determination of trace elements in granites by inductively coupled plasma mass spectrometry. Talanta, 51(3), 507-513.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.