Paleoceanographic changes during the late Albian-early Turonian in the Sergipe-Alagoas Basin (Northeast of Brazil) and their link with global events

The file contains four worksheets: (1) the “XRF raw data” worksheet provides the X-Ray Fluorescence data obtained in samples from the Sergipe-Alagoas Basin. Analyses were performed using a Rigaku Supermini 200 Wavelength Dispersive XRF sequential spectrometer and the ZSX software by Rigaku. Results are displayed in counts per second. Only the data discussed in the paper “Paleoceanographic changes during the late Albian-early Turonian in the Sergipe-Alagoas Basin (Northeast of Brazil) and their link with global events” are reported. ND: not determined; (2) the “XRF normalized” worksheet presents the elemental data as normalized with respect to the sum of all elements measured in a sample and as the logarithms of elemental ratios. ND: not determined; (3) the “Magnetic data” worksheet contains Magnetic Susceptibility (MS) values measured at 976 Hz (Frequency 1) using a MFK1-FA Kappabridge (Advanced Geophysical Instruments Company, AGICO), and paleomagnetic data obtained with a 2G Enterprises 755-4K Long Core Squid magnetometer and a pulser. They include the Saturation of Isothermal Remanent Magnetization (SIRM), Backfield Isothermal Remanent Magnetization (BIRM), and S-ratio. MS/Fe values were obtained after normalizing both MS (m3/Kg) and Fe/sum data to the mean equals zero and standard deviation equals one (i.e., zero-mean normalization); (4) the “Age model” worksheet contains the ln (K/Al) data linearly interpolated for an average sampling space of 3.05 m, with the respective spectral analysis obtained with the redfit method using the software PAST, and the ln (K/Al) data filtered in the long eccentricity (400 kyr) frequency range. The worksheet also reports the tie points obtained by tuning the filtered ln (K/Al) data with the astronomical solution from Laskar et al. (2011), also filtered at the long eccentricity. The age model obtained with the astronomical tuning provided the sedimentation rate.

本文件包含四个工作表：(1) "X射线荧光原始数据（XRF raw data）"工作表收录了塞尔吉皮-阿拉戈斯盆地（Sergipe-Alagoas Basin）样品的X射线荧光（X-Ray Fluorescence, XRF）测试数据。分析采用理学（Rigaku）Supermini 200型波长色散顺序式X射线荧光光谱仪完成，并配套使用理学的ZSX软件进行处理。测试结果以每秒计数为单位展示。本数据集仅收录了论文《巴西东北部塞尔吉皮-阿拉戈斯盆地阿尔布阶晚期-土仑阶早期古海洋变化及其与全球事件的关联》中讨论的相关数据。ND: 未测定（not determined, ND）；(2) "XRF归一化数据（XRF normalized）"工作表展示了以样品中所有被测元素总量为基准进行归一化处理的元素数据，以及元素比值的对数值。ND: 未测定；(3) "磁学数据（Magnetic data）"工作表包含使用MFK1-FA型 kappabridge（高级地球物理仪器公司，AGICO）在976Hz（频率1）下测得的磁化率（Magnetic Susceptibility, MS）值，以及使用2G Enterprises 755-4K型长岩心超导量子干涉磁力仪（Long Core Squid magnetometer）和脉冲发生器获取的古地磁数据。相关数据包括等温剩磁饱和值（Saturation of Isothermal Remanent Magnetization, SIRM）、反向等温剩磁（Backfield Isothermal Remanent Magnetization, BIRM）以及S比值。MS/Fe值通过将磁化率（单位：m³/Kg）与Fe/总元素数据均进行均值为0、标准差为1的标准化处理（即零均值标准化）后计算得到；(4) "年龄模型（Age model）"工作表包含针对平均采样间距3.05m进行线性插值得到的ln(K/Al)数据，以及使用PAST软件通过redfit方法完成的频谱分析结果，同时收录了在长偏心率（400 kyr）频率范围内滤波后的ln(K/Al)数据。本工作表还记录了通过将滤波后的ln(K/Al)数据与Laskar等人（2011）提出的、同样经过长偏心率滤波的天文解进行调谐得到的调谐控制点。通过天文调谐构建的年龄模型可用于计算沉积速率。