⁴⁰Ar/³⁹Ar step-heating data and preferred-age calculations for the northeastern Carajás Province, Amazonian Craton, Mendeley Data

Complete ⁴⁰Ar/³⁹Ar incremental step-heating dataset for the northeastern Carajás Province, southeastern Amazonian Craton, Brazil, with the source data underlying the figures of the associated article. The dataset comprises 536 step-heating analyses of 14 samples (31 aliquots) plus a hornblende standard, and a further 85 analyses of four grains of the hydrothermal reference sample Serra Verde-01. Dated minerals are hornblende, actinolite, anthophyllite, tremolite, biotite and white mica, hand-picked from mapped tectonic fabrics or from well-defined hydrothermal assemblages along a north–south transect crossing Mesoarchean basement, Neoarchean supracrustal and intrusive rocks of the Itacaiúnas Supergroup, and Paleoproterozoic cover. Analyses were performed by laser incremental heating at the Argon Geochronology in Earth Sciences laboratory, The University of Queensland. Samples were irradiated for 14 h at the B-1 CLICIT facility, Oregon State University, with Fish Canyon sanidine monitors at 28.201 Ma (Kuiper et al., 2008). Ages use the decay constants of Min et al. (2000) and an atmospheric ⁴⁰Ar/³⁶Ar of 298.56. For every analysis the data include measured and corrected Ar isotope intensities with uncertainties; ⁴⁰Ar/³⁹Ar, ³⁷Ar/³⁹Ar, ³⁸Ar/³⁹Ar and ³⁶Ar/³⁹Ar ratios; radiogenic ⁴⁰Ar*; ³⁹Ar moles and the fraction of ³⁹Ar released per step and cumulatively; Ca/K and Cl/K; apparent ages with analytical and J-propagated uncertainties; and the isotope-correlation parameters and error correlations needed to reproduce inverse-isochron regressions. Irradiation parameters, neutron-induced interference corrections, mass discrimination factors, decay constants, monitor age and atmospheric ratios are reported once in a dedicated metadata sheet rather than repeated on every row, following the reporting recommendations of Schaen et al. (2021). Exact step selections, regression statistics and selection status for the FT-009C inverse-isochron arrays are given in a separate sheet, and a sample key maps laboratory identifiers to the sample names used in the article. The data resolve a polyphase ca. 2.61–2.52 Ga hydrothermal amphibole record, ca. 2.20 Ga fluid-assisted re-equilibration, Rhyacian fabric recrystallization at ca. 2.08–2.05 Ga, an Early Orosirian event at ca. 2.01–1.96 Ga, and a ca. 1.88 Ga Uatumã hydrothermal overprint.巴西亚马逊克拉通东南部卡拉加斯省东北部的完整⁴⁰Ar/³⁹Ar阶跃加热数据集，本数据集为关联论文附图的原始数据支撑。 本数据集包含14个样品（31份分装样）的536次阶跃加热分析，外加1个角闪石标样；另有热液参考样品Serra Verde-01的4个颗粒的85次分析。本次定年的矿物包括角闪石、阳起石、直闪石、透闪石、黑云母和白云母，这些矿物均采自已填绘的构造组构，或是沿南北向剖面采集的典型热液组合，该剖面跨越中太古界基底、伊塔卡伊纳斯超群的新太古界表壳岩与侵入岩，以及古元界盖层。 所有分析均在昆士兰大学地球科学学院氩同位素年代学实验室通过激光阶跃加热完成。样品在美国俄勒冈州立大学B-1 CLICIT辐照装置中辐照14小时，采用年龄为28.201 Ma的鱼峡谷透长石作为年龄标样（Kuiper等，2008）。年龄计算采用Min等（2000）的衰变常数，以及大气⁴⁰Ar/³⁶Ar比值298.56。 每份分析的数据包含带不确定度的实测与校正后的氩同位素强度；⁴⁰Ar/³⁹Ar、³⁷Ar/³⁹Ar、³⁸Ar/³⁹Ar及³⁶Ar/³⁹Ar比值；放射成因⁴⁰Ar*；³⁹Ar摩尔量、单次阶跃及累计释放的³⁹Ar占比；Ca/K与Cl/K比值；带分析不确定度及J因子传递不确定度的视年龄；以及用于重现逆等时线回归的同位素相关参数与误差相关系数。按照Schaen等（2021）的报告规范，辐照参数、中子诱发干扰校正、质量分馏因子、衰变常数、标样年龄及大气同位素比值仅在专属元数据表中统一给出，而非在每一行数据中重复。FT-009C逆等时线阵列的精确阶跃选择、回归统计量及选择状态将在单独工作表中给出，另有样品对照表将实验室编号映射为论文中使用的样品名称。 本数据集揭示了多期次的热液活动记录：约2.61~2.52 Ga的热液角闪石形成事件、约2.20 Ga的流体辅助再平衡作用、约2.08~2.05 Ga的里奥塞期组构重结晶作用、约2.01~1.96 Ga的奥罗斯纪早期事件，以及约1.88 Ga的乌图马依热液叠加改造作用。