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The Miaoershan-Yuechengling complex pluton is the largest granitoid complex in the western Nanling metallogenic belt with a surface exposure of >3000 km 2 . The complex pluton is composed of an early stage granitoid batholith and late stage small intrusions. The early stage batholith contains mainly medium-grained porphyritic mica granite and porphyritic monzonite granite, whereas the late stage intrusions are composed of muscovite granite porphyry and muscovite monzonitic granite. There are many W-Sn-Mo-Pb-Zn-Cu ores in the contact zone between the batholith and strata, forming an ore-rich belt around the batholith. Based on zircon LA-ICP-MS U-Pb ages, the southwestern part of the early stage batholith formed at 228.7 ± 4.1 Ma (MSWD = 2.49), with slightly earlier magmatic activity at 243.0 ± 5.8 Ma (MSWD = 2.62). The Yuntoujie muscovite granite was associated with W-Mo mineralization and has a zircon LA-ICP-MS U-Pb age of 216.8 ± 4.9 Ma (MSWD = 1.44). The Re-Os isochron age of molybdenite from the Yuntoujie W-Mo ore was 216.8 ± 7.5 Ma (MSWD = 11.3). Our new isotope data suggest that the late stage intrusive stocks from the southwestern Miaoershan-Yuechengling batholith were closely associated with W-Mo mineralization from the Indosinian period. These new results together with previous isotope data, suggest that South China underwent not only the well-known Yanshanian mineralization event, but also a widespread Indosinian metallogenic event during the Mesozoic period. Therefore, South China has a greater potential for Indosinian mineralization than previously thought such that more attention should be given to the Indosinian ore prospecting in South China. The Nanling metallogenic ore belt is well known for its WSn-Be-Nb-Ta-REE mineralization and has attracted much attention from geoscientists worldwide. A large amount of the work from South China has examined the temporal and spatial distributions of the granitoids and their associated mineralizations . Most of that work focuses on the granitoids and related deposits in the middle and the eastern parts of the Nanling ore belt, whereas there is less research from the western part of Nanling ore belt. South China underwent both Indosinian and Yanshanian structural-magmatic events with more focus on the Yanshanian stage mineralization. The Miaoershan-Yuechengling complex pluton is the largest granitoid pluton outcrop in the western Nanling metallogenic belt. Many W-Sn (Mo) and Pb-Zn-Cu deposits

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