Magmatic Processes of the Lingshan Granitic Batholith in the Dabie Orogen, Central China: Insights into Dabie-Type Porphyry Mo Mineralization

Abstract

Dabie-type porphyry Mo deposits were proposed as a new type of porphyry Mo deposits, and had unique geological characteristics. It is still poorly understood about the magmatic processes that led to the Dabie-type Mo mineralization. Here, we present zircon U-Pb and Lu-Hf isotopic, whole-rock and biotite elemental, and whole-rock Sr-Nd isotopic analyses on the Lingshan granitic batholith in the Dabie Orogen. It consists of three units (I to III) that were emplaced before, genetically accompanied with, and after the Mo mineralization. LA-ICP-MS zircon U-Pb dating yielded crystallization ages of 128.2 ± 1.0 Ma (MSWD = 1.14) for Unit I and ages of 127.8 ± 1.2 Ma (MSWD = 0.28) and 126.6 ± 1.8 Ma (MSWD = 1.6) for Unit II, indicating that they were emplaced during 130 to 125 Ma. The granites have high SiO₂ contents (75.84 wt.% to 78.94 wt.%) and low MgO contents (0.07 wt.% to 0.10 wt.%), and are classified as fractionated I-type granite. Units I and II have similar Sr-Nd isotopic ratios (ε_Nd(t) = −16.2 to −17.2, (⁸⁷Sr/⁸⁶Sr)_i = 0.705 40 to 0.706 92) and zircon ε_Hf(t) values (−17.4 to −20.4), indicating they were derived from partial melting of the ancient Yangtze lower crust. Mo mineralized granite from Unit II is characterized by the lower oxygen fugacity, fluorine enrichment and high fractionation. Magmas of units I and II have experienced fractional crystallization, with the assimilation of supracrustal materials that account for the increased TiO₂, F and Mo contents, and the decreased ƒO₂. We proposed that the assimilation in upper-crustal magmatic processes plays key factors for magmatic systems that led to the Dabie-type porphyry Mo deposits.

Keywords

granite / crustal assimilation / oxygen fugacity / porphyry Mo deposit / Dabie Orogen / mineral deposits

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