法国比利牛斯造山带橄榄岩单矿物主量元素数据

法国比利牛斯造山带橄榄岩单矿物主量元素数据，来源于中国科学技术大学检测，加工方法为将样品探针片经过前处理后用于电子探针JXA-8530F Plus和LA-ICP-MS实验数据采集，测试过程中采用的加速电压为15 kV，电流为10 nA，束斑直径为3 μm。峰位的测试时间为10 s，背景的测试时间为峰位的一半。标样是来自SPI和P&H公司的天然或合成矿物。使用ZAF法对数据进行基体校正。对于通常大于1.0 wt.%的元素，分析精度优于±10%（2σ）。基于地球化学视角区分熔融耗竭与再富集产物，并限定次大陆岩石圈地幔（SCLM）内地幔-熔体相互作用的时限仍是亟待解决的关键问题。本研究通过alphaMELTS热力学模拟系统解析比利牛斯造山带Lherz地幔岩的成因演化：①部分熔融与再富集作用在元素响应上存在显著差异——再富集作用表现为升高的TiO₂/Al₂O₃比值及全岩/单斜辉石中更高的重稀土元素（HREE）丰度；②Lherz橄榄二辉岩主体为古元古代（~2.0 Ga）高程度部分熔融的残余体，少量具低熔体/岩石比的再富集特征；与橄榄纹层状岩密切共生的二辉橄榄岩为原始难熔型harzburgites与上升N-MORB型熔体相互作用的次生产物；而缺乏特殊空间关联的lherzolites则可能源于软流圈地幔经历中等程度绝热上涌后，在岩石圈基底经静态冷却形成。
通过创新性改良渗透模型结合Re-Os与Lu-Hf同位素体系分析，首次提出再富集事件发生于1.5–2.0 Ga期间。结合全球克拉通与非克拉通区SCLM成分数据库对比显示：①硅酸盐熔体主导的再富集作用可通过元素水平有效鉴别；②不同熔融机制对SCLM成分演化的贡献具有时空分异特征；③再富集过程通过改变地幔的地球化学特征（如Mg#降低、密度增大）与机械强度（如黏度变化），深刻影响了古老SCLM的稳定性与长寿期维持机制。该研究为理解大陆岩石圈多阶段演化提供了新的理论框架。

Major element data of single minerals from peridotites in the Pyrenean orogenic belt, France, were measured at the University of Science and Technology of China (USTC). The sample probe slices were pre-treated prior to data collection using electron probe microanalyzer JXA-8530F Plus and LA-ICP-MS. During testing, the accelerating voltage was 15 kV, beam current was 10 nA, and beam spot diameter was 3 μm. The counting time for peak positions was 10 s, while that for background was half of the peak counting time. Standard reference materials were natural or synthetic minerals from SPI and P&H companies. Data matrix correction was performed using the ZAF method. For elements with concentrations generally greater than 1.0 wt.%, the analytical precision was better than ±10% (2σ). Distinguishing between melt-depleted and refertilized products from a geochemical perspective, and constraining the timescale of mantle-melt interactions within the subcontinental lithospheric mantle (SCLM), remain key unresolved issues. This study used the alphaMELTS thermodynamic modeling system to decipher the genetic evolution of Lherz mantle peridotites in the Pyrenean orogenic belt: ① Partial melting and refertilization show distinct elemental responses—refertilization is characterized by elevated TiO₂/Al₂O₃ ratios and higher heavy rare earth element (HREE) abundances in whole rocks and clinopyroxenes; ② The majority of Lherz lherzolites are residues of high-degree partial melting in the Paleoproterozoic (~2.0 Ga), with a small portion exhibiting refertilization characteristics with low melt/rock ratios; the harzburgites closely associated with olivine-layered rocks are secondary products formed by the interaction of primitive refractory harzburgites with ascending N-MORB-type melts; while lherzolites without special spatial associations may originate from asthenospheric mantle that experienced moderate adiabatic upwelling and then underwent static cooling at the lithospheric basement.

Through innovatively modified infiltration models combined with Re-Os and Lu-Hf isotopic system analyses, this study first proposed that the refertilization events occurred between 1.5–2.0 Ga. Combined with comparisons with global SCLM composition databases from cratonic and non-cratonic domains, the results show that: ① Silicate melt-dominated refertilization can be effectively identified using elemental data; ② The contributions of different melting mechanisms to the compositional evolution of SCLM exhibit temporal and spatial differentiation; ③ The refertilization process profoundly affects the stability and longevity maintenance mechanisms of ancient SCLM by altering the geochemical characteristics (e.g., decreased Mg#, increased density) and mechanical strength (e.g., changes in viscosity) of the mantle. This study provides a new theoretical framework for understanding the multi-stage evolution of continental lithosphere.