Although discriminating high temperature mineral systems, for example, magmatic- vs magmatic-hydrothermal origin Fe deposits, is challenging, the emerging Fe isotope systematics have shown good potentials to provide crucial information on resolving the problem. Here, Fe isotopes of multiple types of samples from one iron oxide-apatite (IOA) deposit and two skarn Fe deposits are measured, aiming to study their behaviors in high temperature magmatic and magmatic-hydrothermal environments. The primary observation of this study is that magnetite samples from high grade ores of magmatic origin IOA deposits has a heavier Fe isotopic signature relative to the associated igneous rocks, whereas a lighter Fe isotopic composition in magnetite samples from magmatic-hydrothermal origin skarn deposits relative to the causative intrusions. Another distinctive feature is that δ⁵⁶Fe values of the causative intrusions in the magmatic origin IOA deposits are lighter than that of non-fertile intrusions, whereas the ore-associated intrusions of the magmatic-hydrothermal deposit are heavier in δ⁵⁶Fe than that of non-fertile igneous rocks. The above two observed scenarios suggest that Fe isotope fractionation exists in both magmatic immiscibility and hydrothermal fluid exsolution processes. Magma immiscibility leads to heavy Fe isotope enrichment in immiscible Fe-rich melt phase, and resulting light Fe enrichment in Si-rich melt phase. Hydrothermal fluid exsolution results in lighter Fe isotope enrichment in the exsolved liquid phase, with a heavy Fe isotope enrichment in the residual magma. Fe isotopes behave in different ways in magmatic and magmatic-hydrothermal mineralization processes, which makes Fe isotopes an effective tool to discriminate mineral deposits of magmatic origin from those formed by magmatic-hydrothermal processes.

尽管区分高温矿物系统（例如岩浆与岩浆热液成因的Fe矿床）具有挑战性，但新兴的Fe同位素系统已显示出良好的潜力，可为解决该问题提供关键信息。在此，对一种氧化铁-磷灰石（IOA）矿床和两个矽卡岩型Fe矿床的多种样品的Fe同位素进行了测量，旨在研究其在高温岩浆和岩浆热液环境中的行为。这项研究的主要观察结果是，相对于相关的火成岩，来自岩浆成因IOA矿床的高品位矿石的磁铁矿样品具有较重的Fe同位素特征，而相对于相关的火成岩热液矽卡岩矿床，磁铁矿样品中的Fe同位素组成更轻。因果关系。^56个在岩浆成因致病入侵的铁值IOA沉积物低于非侵入肥沃的打火机，而岩浆热液矿床的矿相关入侵是在δ较重⁵⁶铁比非肥沃的火成岩。以上两个观察到的情况表明，在岩浆不混溶和热液流体解吸过程中都存在铁同位素分馏。岩浆不混溶导致富铁不溶混熔体中大量的铁同位素富集，并导致富硅熔体相中轻铁富集。水热流体的析出导致溶解液相中的Fe同位素富集较轻，剩余岩浆中Fe同位素富集较重。铁同位素在岩浆和岩浆热液成矿过程中表现出不同的方式，这使铁同位素成为区分岩浆来源矿床和岩浆热液过程中矿床的有效工具。