The Dashuigou tellurium deposit is the world’s only known independent tellurium deposit. By restoring metamorphic rocks’ protolith, we seek to understand not only the development and evolution trajectory of the region but also the origin of the relevant deposits. While there are many ways to restore metamorphic rocks’ protolith, we take the host metamorphic rocks of Dashuigou tellurium deposit and leverage various petrochemical eigenvalues and related diagrams previously proposed to reveal the deposit’s host metamorphic rocks’ protolith. The petrochemical eigenvalues include molecular number, Niggli’s value, REE parity ratio, CaO/Al2O3 ratio, Fe3+/(Fe3+ + Fe2+) ratio, chondrite-normalized REE value, logarithmic REE value, various REE eigenvalues including scandium, Eu/Sm ratio, total REE amount, light and heavy REEs, δEu, Eu anomaly, Sm/Nd ratio, and silicon isotope δ30SiNBS−28‰, etc. The petrochemical plots include ACMs, 100 mg-c-(al + alk), SiO2-(Na2O + K2O), (al + fm)-(c + alk) versus Si, (FeO + Fe2O3 + TiO)–Al2O3–MgO, c-mg, Al2O3–(Na2O + K2O), chondrite-normalized REE model, La/Yb-REE, and Sm/Nd ratio, etc. On the basis of these comprehensive analyses, the following conclusions are drawn, starting from the many mantle-derived types of basalt developed in the study area of different geological ages, combined with the previously published research results on the deposit's fluid inclusions and sulfur and lead isotopes. The deposit is formed by mantle degassing in the form of a mantle plume in the late Yanshanian orogeny. The degassed fluids are rich in nano-scale substances including Fe, Te, S, As, Bi, Au, Se, H2, CO2, N2, H2O, and CH4, which are enriched by nano-effect, and then rise to a certain part of the crust in the form of mantle plume along the lithospheric fault to form the deposit. The ultimate power for tellurium mineralization was from H2 flow with high energy, which was produced through radiation from the melted iron of the Earth’s outer core. The H2 flow results in the Earth’s degassing, as well as the mantle and crust’s uplift.
