Olivine‐hosted melt inclusions have the potential to provide direct evidence about the nature of the mantle sources of magmas. In this study, we report the major and trace element and Sr–Nd–Pb–Hf isotope compositions of the Lijiang picrites from the Emeishan large igneous province, as well as major and trace element and Pb isotopic compositions of olivine‐hosted melt inclusions in the picrites. Using these data, we infer the nature of the mantle sources for the Lijiang high‐Ti picrites (Ti/Y = 645–654), and compare them with the Dali low‐Ti picrites (Ti/Y = 351–408). Lijiang melt inclusions have highly heterogeneous Pb isotope compositions (²⁰⁸Pb/²⁰⁶Pb = 2.015–2.201, ²⁰⁷Pb/²⁰⁶Pb = 0.812–0.882, 260 Ma age‐corrected) that overlap the majority of the fields from FOZO to enriched mantle 1 (EM1). The primitive mantle‐normalized trace element patterns of these melt inclusions reveal an enriched composition with depletions in Ba, Nb, Ta, Zr, and Hf. We suggest that an old recycled GLOSS II‐like sediment was probably the main component that imparted the EM1 signature into the sources of the Lijiang picrites. Furthermore, we reverse calculated the mantle potential temperature (T_p) beneath Lijiang and Dali using the Al‐in‐ol temperature. The estimated mantle T_p beneath Lijiang is lower than Dali. We infer that the Lijiang picrites might have originated from the mantle plume with lower thermal energy, corresponding to the waning stage of the axis of the Emeishan mantle plume. Our study suggest that high‐Ti magmas of the Emeishan large igneous province were derived from those parts or stages of the mantle plume with lower thermal energy.

中文翻译：

---

峨眉山大火成岩省下地幔柱的性质：丽江Pic石的橄榄石包裹熔体包裹体的约束

橄榄石包裹的熔体包裹体有可能提供有关岩浆幔源性质的直接证据。在这项研究中，我们报告了峨眉山大火成岩省丽江微粉岩的主要和微量元素及Sr–Nd–Pb–Hf同位素组成，以及该地区橄榄石熔体包裹体的主要和微量元素及Pb同位素组成。野餐。利用这些数据，我们可以推断出丽江高钛微粉矿（Ti / Y = 645–654）的地幔源的性质，并将其与大理低钛微粉矿（Ti / Y = 351–408）进行比较。丽江熔化夹杂物具有高度不均匀的Pb同位素组合物（²⁰⁸ PB / ²⁰⁶ PB = 2.015-2.201，²⁰⁷的Pb / ²⁰⁶Pb = 0.812–0.882，年龄校正后为260 Ma），与从FOZO到富集地幔1（EM1）的大部分油田重叠。这些熔体包裹体的原始地幔归一化痕量元素模式显示出富含Ba，Nb，Ta，Zr和Hf的富集成分。我们认为，旧的再生的GLOSS II类沉积物可能是将EM1签名赋予丽江苦味源的主要成分。此外，我们使用Al-in-ol温度_对丽江和大理以下的地幔势温度（T _p）进行了反向计算。估计地幔T _p丽江以下低于大理。我们推测，丽江的rite石可能起源于热能较低的地幔柱，这与峨眉山地幔柱轴线的减弱阶段相对应。我们的研究表明，峨眉山大火成岩省的高Ti岩浆来自地幔柱的那些部分或阶段，具有较低的热能。