Olivine (Fo80-88) from the Shitoukengde deposit exhibits low levels of Ca, Cr, and Al (< 220 ppm) and varying Ni content. The low Ca-Cr-Al contents in olivine and subsolidus temperatures (600–900 °C) indicated by olivine-spinel thermometers align with subsolidus equilibria, emphasizing substantial postcumulus modifications. Therefore, the postcumulus effect must be considered when applying olivine-spinel oxybarometers to intrusive rocks. Back-calculating the spinel Fe–Mg contents to magmatic temperature, the estimated oxidation fugacity (fO₂) range between FQM − 1.5 and FQM − 3.0, approximately 0.5 to 1.5 ΔFQM more reduced compared to those calculated from the raw spinel composition. Moreover, the fO₂ aligns with results obtained from the olivine-sulfide pair (FMQ − 3.0 to FMQ 0). The considerably reducing state and wide oxidation variation are consistent with the graphite occurrence within the reduced intervals and the systematic fO₂ indicated by olivine V/Sc ratios. Combined with the wide olivine Ni range (200–1500 ppm) and the restricted Ni tenor in coexisting sulfides, those findings imply that the olivine-sulfide interaction was predominantly controlled by fO₂. Diffusion modeling at magmatic temperatures reveals that the core-level Fe–Ni re-equilibration after crystallization requires hundreds of years. The homogeneous olivine composition suggests that re-equilibrium has been achieved in Shitoukengde. However, in fast cooling systems, olivine may record the status approaching olivine-sulfide equilibration, leading to extensive intragrain Ni variation (up to 1000 ppm). This study highlights that extreme Ni depletion in olivine from sulfide-bearing rocks is a sign of reducing conditions. Strongly Ni-rich olivine, such as those in the Kevitsa deposit, could result from interaction with high-Ni tenor sulfides at oxidizing conditions.

石头坑德矿床的橄榄石 (Fo80-88) 的钙、铬和铝含量较低 (< 220 ppm)，镍含量也不同。橄榄石-尖晶石温度计显示，橄榄石和次固相线温度 (600–900 °C) 中的 Ca-Cr-Al 含量较低，与次固相线平衡一致，强调了大量的后积云修改。因此，橄榄石-尖晶石氧压计应用于侵入岩时必须考虑后积云效应。将尖晶石 Fe-Mg 含量反算到岩浆温度，估计的氧化逸度 ( f O ₂ ) 范围在 FQM - 1.5 和 FQM - 3.0 之间，与根据原始尖晶石成分计算的值相比，大约减少了 0.5 至 1.5 ΔFQM。此外，f O ₂与从橄榄石-硫化物对（FMQ - 3.0 到 FMQ 0）获得的结果一致。显着的还原态和广泛的氧化变化与还原区间内石墨的出现以及橄榄石V/Sc比率指示的系统f O _2一致。结合广泛的橄榄石镍范围（200-1500 ppm）和共存硫化物中有限的镍含量，这些发现意味着橄榄石-硫化物相互作用主要受f O ₂控制。岩浆温度下的扩散模型表明，结晶后核心层的 Fe-Ni 重新平衡需要数百年。均匀的橄榄石成分表明石头坑德已经实现了重新平衡。然而，在快速冷却系统中，橄榄石可能记录接近橄榄石-硫化物平衡的状态，导致晶粒内镍的广泛变化（高达 1000 ppm）。这项研究强调，含硫化物岩石中橄榄石中镍的极度贫乏是还原条件的标志。高镍橄榄石（例如 Kevitsa 矿床中的橄榄石）可能是在氧化条件下与高镍本质硫化物相互作用产生的。