Abstract
The Leimengou Mo deposit is one of the typical porphyry deposits in the East Qinling molybdenum ore belt. The Mo mineralization mainly hosts in the Leimengou intrusion, with minor by the gneiss of Archean Taihua Group. The Leimengou intrusion is composed of granite porphyry and monzonitic granite porphyry. Zircon U–Pb LA-(MC)-ICP-MS dating of the two rocks yield the same age of 131 ± 0.6 Ma (N = 23, MSWD = 1.6), consistent with 132 ± 2 Ma of Mo mineralization age obtained by the Re–Os method. The Leimengou intrusion is peraluminous (A/CNK = 1.06–1.28) and high-K calc-alkaline series (K2O + Na2O = 7.84%–9.07%). The REE and trace elements are enriched in large ion lithophile elements (LREE, K, Rb, Ba, Sr, Th and U), and depleted in high-field strength elements (HREE, Nb, Ti and P), with moderately negative abnormal of Eu. Both granite porphyry and monzonitic granite porphyry show a large variation in zircon Hf isotopic compositions with εHf(t) values of −27.9 to −16.9 and −26.0 to −15.2, and two-stage model ages of 2259 to 2946 Ma and 2149 to 2827 Ma, respectively. Whole rock geochemistry and zircon Lu–Hf isotopic compositions suggest that the Leimengou intrusion was derived mainly from an ancient continental crust (probably Archean Taihua Group), with the addition of mantle-derived components.
Highlights
The East Qinling molybdenum ore belt, located on the southern margin of the North China Block, is one of the most important molybdenum polymetallic metallogenic belts in China
The zircons selected from the Leimengou granite porphyry and monzonitic granite porphyry are similar in shape and size
The above characteristics indicate that the zircon of the Leimengou granite porphyry and monzonitic granite porphyry is of magma genesis
Summary
The East Qinling molybdenum ore belt, located on the southern margin of the North China Block, is one of the most important molybdenum polymetallic metallogenic belts in China. (Figure 1), which are contemporary with the porphyry (-skarn) Mo deposits and ore-related porphyry intrusions. The Donggou granite porphyry is considered as the branch of Taishanmiao batholith or the late. The Donggou granite porphyry is considered as the branch of Taishanmiao batholith or the late product of its differentiation [2,3]. Geochemical studies in recent years have shown that these ore-related porphyries are porphyries are genetically correlated to their adjacent batholiths, and that they have the same source genetically correlated to their adjacent batholiths, and that they have the same source region [4,5], region [4,5], and may have magma evolution relationship [2,3,6].
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