Magmatic microgranular enclaves (MMEs) are widely developed in the Shaocunwu granodiorite at the northeast margin of the eastern Jiangnan orogenic belt. Field geology showed that the MMEs occur as irregular ellipsoids near the edge of the intrusion, and consist of diorite, dominantly composed of amphibole, biotite, and plagioclase grains, with minor acicular apatite. Zircon U-Pb dating showed the ages of the host granodiorites and MMEs are 145.9 ± 1.1 Ma and 145.6 ± 2.5 Ma, respectively, indicating both originated during coeval late Jurassic magmatism. Whole-rock geochemical results show that the host granodiorite and MMEs have similar rare earth and trace element partition curves in spider grams, and similar ⁸⁷Sr/⁸⁶Sr, and ¹⁴⁷Nd /¹⁴⁴Nd isotope ratios, and their zircon ¹⁷⁷Hf/¹⁷⁶Hf isotopic ratios are similar. Geochemical studies indicate that both the host granodiorite and MMEs formed by mixing of coeval magma. Zircon Ti thermometers and oxygen fugacity of the host granodiorite and the MMEs show high oxygen fugacity, similar to that of W-Cu (Mo) mineralized granitoids in the eastern Jiangnan orogenic belt. A similar magma mixing process was probably one of the mechanisms that generated the W-Cu (Mo) fertile melts.

中文翻译：

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华南少村坞花岗闪长岩中镁铁质微粒包体的成因及其意义：来自锆石和全岩地球化学的证据

江南造山带东缘的邵村屋花岗闪长岩中广泛发育岩浆微粒包体(MME)。野外地质表明，MME在侵入体边缘附近呈不规则椭球体，由闪长岩组成，主要由角闪石、黑云母和斜长石颗粒组成，少量针状磷灰石。锆石U-Pb定年显示寄主花岗闪长岩和MME的年龄分别为145.9±1.1 Ma和145.6±2.5 Ma，表明两者均起源于同期晚侏罗世岩浆作用。全岩地球化学结果表明，寄主花岗闪长岩和 MMEs 具有相似的稀土和微量元素分配曲线，⁸⁷ Sr/ ⁸⁶ Sr 和¹⁴⁷ Nd/ ¹⁴⁴Nd 同位素比值和它们的锆石¹⁷⁷ Hf/ ¹⁷⁶ Hf 同位素比值相似。地球化学研究表明，寄主花岗闪长岩和 MME 都是由同时代的岩浆混合形成的。寄主花岗闪长岩和 MME 的锆石 Ti 温度计和氧逸度显示出较高的氧逸度，与江南造山带东部 W-Cu (Mo) 矿化花岗岩相似。类似的岩浆混合过程可能是产生 W-Cu (Mo) 肥沃熔体的机制之一。