华北克拉通南缘利国 铁-铜-金矿床利国侵入体数据库（2018-2019）

数据集包括利国铁-铜-金矿床利国侵入体的全岩主微量元素、Sr-Nd同位素组成、磷灰石的主微量元素以及磷灰石的Sr-O同位素组成。全岩主微量元素在澳实分析检测（广州）有限公司分析，经过偏硼酸锂熔融，使用X射线荧光(XRF)光谱仪分析主量元素，分析准确度和精确度在1%以内，微量元素用ICP-MS分析，分析准确度和精确度在5%以内。Sr-Nd同位素组成在中国科学院广州地球化学研究所用MC-ICP MS分析，测量的143Nd/144Nd和87Sr/86Sr比分别标准化标与标准样品的标准值非常一致。采用标准的破碎、筛分、重液分离和磁分离技术从全岩石样品中收集磷灰石，然后安装在一个环氧树脂盘中，并抛光到近一半的部分，以暴露内部结构。磷灰石主量元素在国家海洋局第而海洋研究所使用电子探针分析。微量元素在中国科学院广州地球化学研究所矿物学与成矿学重点实验室通过原位LA ICP-MS进行分析。仪器工作条件为，消融时间40s，激光斑点直径为43μm，重复频率为6Hz。使用NIST610作为主要的外部校准标准，使用43Ca（由定量电子微探针法确定）作为内部标准。漂移校正、离线选择、集成背景和分析信号，以及微量元素的定量校准都使用ICP-MS DataCal软件进行校准。磷灰石原位Sr同位素分析在西北大学地质系大陆动力学国家重点实验室，仪器工作条件为，消融时间为50s，激光斑点直径为60μm，重复频率为6Hz。根据Sr987和Alfa Sr标准校准磷灰石的同位素成分。测量的磷灰石标准Sr987的87Sr/86Sr比值和AlfASr的分别为0.71025±21（n=29,2σ）和0.70727±32（n=30,2σ）。在北京SHRIMP中心测量了磷灰石原位氧同位素分析。SHRIMP IIe/MC配备了可拆卸的Cs主离子源、电子枪、多集电器和亥姆霍兹线圈，以获得高精度的O同位素测量。每18O/16O分析取约7min，斑点直径为23μm。用Durango磷灰石的同位素成分进行了校准。Durango磷灰岩实测δ18O平均值为9.81±0.66‰（2σ），与以往误差范围内的研究结果相似。因此以上数据均具有可靠性。
该数据集包括含矿岩体以及其磷灰岩地球化学和同位素特征，可以帮助我们了解它的岩石成因和矿化的控制因素。来自I组和II组的磷灰岩都是岩浆成因的含氟磷灰岩，其特征为负Eu异常、富集LREE、亏损HREE。同时，两组均具有较高的Sr/Y和δEu，表明了源岩的斑岩埃达克岩特征。与整个岩石的同位素相比，两组磷灰岩的变量87Sr/86Sr（0.70250-0.71262）和δ18O（6.22-9.00）值表明了地幔、地壳和/或沉积物衍生物的贡献。虽然I组磷灰石和II组磷灰岩具有相似的地球化学特征，但I组磷灰石先于斜长石结晶，无Sr-（La/Yb）N/（La/Sm）N/（Sm/Yb）N相关性，而II组磷灰石与斜长石结晶一致，呈正相关。这些对氧化还原环境敏感的元素(δEu、δCe、MnO、V)的地球化学表明，显示出高氧逸度(在HM和NNO之间)，I组磷灰石系统的氧逸度高于II组磷灰石。更重要的是，第一组磷灰石和第二组磷灰石之间不同的微量元素和氧逸度特性可以作为矿化指标，首次绘制出铁-铜-金矿化范围。此外，母岩浆中估计的F和Cl含量（F=1300-2446ppm，Cl=140-4780ppm）高于原始地幔和平均大陆地壳中的含量，表明来F和Cl的富集过程。根据上述埃达克岩特征、高氧逸度、高氟氯含量，推测太平洋板块俯冲可能是利国成岩和矿化的主要动力机制。

This dataset includes whole-rock major and trace elements, Sr-Nd isotopic compositions, apatite major and trace elements, and apatite Sr-O isotopic compositions from the Liguo intrusion of the Liguo iron-copper-gold deposit.
Whole-rock major elements were analyzed using an X-ray fluorescence (XRF) spectrometer after lithium metaborate fusion at ALS Testing (Guangzhou) Co., Ltd., with analytical accuracy and precision within 1%. Trace elements were analyzed via inductively coupled plasma mass spectrometry (ICP-MS), with analytical accuracy and precision within 5%. Sr-Nd isotopic compositions were analyzed using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) at the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences. The measured ¹⁴³Nd/¹⁴⁴Nd and ⁸⁷Sr/⁸⁶Sr ratios were normalized to certified reference material values, showing high consistency with standard values.
Apatite was separated from whole-rock samples using standard crushing, sieving, heavy liquid separation and magnetic separation techniques, then mounted in an epoxy mount and polished to expose approximately half of their internal structures. Major elements of apatite were analyzed using an electron probe microanalyzer (EPMA) at the Second Institute of Oceanography, Ministry of Natural Resources, P.R. China. Trace elements of apatite were analyzed via in-situ laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) at the Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences. The operational parameters were: ablation time 40 s, laser spot diameter 43 μm, repetition rate 6 Hz. NIST 610 was used as the primary external calibration standard, and ⁴³Ca (determined by quantitative electron microprobe analysis) was used as the internal standard. Drift correction, offline signal selection, background integration, analytical signal processing, and quantitative calibration of trace elements were all performed using ICP-MS DataCal software.
In-situ Sr isotopic analysis of apatite was conducted at the State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University. The operational parameters were: ablation time 50 s, laser spot diameter 60 μm, repetition rate 6 Hz. The isotopic compositions were calibrated against the Sr987 and Alfa Sr standards. The measured ⁸⁷Sr/⁸⁶Sr ratios of the reference standards Sr987 and Alfa Sr were 0.71025±21 (n=29, 2σ) and 0.70727±32 (n=30, 2σ), respectively.
In-situ oxygen isotopic analysis of apatite was performed at the SHRIMP Center in Beijing. The SHRIMP IIe/MC instrument is equipped with a removable cesium primary ion source, electron gun, multi-collector and Helmholtz coils to achieve high-precision oxygen isotope measurements. Each ¹⁸O/¹⁶O analysis takes approximately 7 minutes, with a spot diameter of 23 μm. Calibration was carried out using the isotopic compositions of Durango apatite. The measured average δ¹⁸O value of Durango apatite was 9.81±0.66‰ (2σ), which is consistent with previous published results within the error range. Thus, all the above data are reliable.

This dataset covers geochemical and isotopic characteristics of the ore-bearing intrusions and associated apatite, which can help constrain the petrogenesis and ore-forming controlling factors of the deposit. Both Group I and Group II apatites are magmatic fluorine-bearing apatites, characterized by negative Eu anomalies, enrichment in light rare earth elements (LREEs) and depletion in heavy rare earth elements (HREEs). Both groups also exhibit high Sr/Y ratios and δEu values, indicating adakitic affinities of their source rocks. Compared to whole-rock isotopic compositions, the ⁸⁷Sr/⁸⁶Sr (0.70250–0.71262) and δ¹⁸O (6.22–9.00) values of the two apatite groups suggest contributions from mantle, crust and/or sedimentary derivatives.
Although Group I and Group II apatites share similar geochemical characteristics, Group I apatite crystallized prior to plagioclase, showing no correlations between Sr and chondrite-normalized (La/Yb)ₙ, (La/Sm)ₙ, or (Sm/Yb)ₙ ratios. In contrast, Group II apatite crystallized contemporaneously with plagioclase, displaying positive correlations between these elements. Geochemical data of redox-sensitive elements (δEu, δCe, MnO, V) indicate high oxygen fugacities (between the hematite-magnetite (HM) and nickel-nickel oxide (NNO) buffers), with the oxygen fugacity of the Group I apatite system being higher than that of Group II.
More importantly, the distinct trace element and oxygen fugacity characteristics between Group I and Group II apatites can serve as ore-forming indicators, enabling the first delineation of the iron-copper-gold mineralization extent. In addition, the estimated F and Cl contents in the parental magma (F=1300–2446 ppm, Cl=140–4780 ppm) are higher than those in the primitive mantle and average continental crust, indicating enrichment processes of F and Cl. Based on the abovementioned adakitic affinities, high oxygen fugacity, and high F and Cl contents, it is inferred that Pacific plate subduction is the primary dynamic mechanism for the Liguo petrogenesis and mineralization.