Calcium carbonate of the lower Pliensbachian Santiurde section (Basque-Cantabrian basin, northern Spain)@en

We present calcium carbonate dataset from the lowermost Pliensbachian organic-rich hemipelagic Santiurde section (Basque-Cantabrian basin, north Iberian palaeomargin, Spain). The Santiurde section studied herein is exposed at exit 144 of motorway A67 (UTM X411431.091 Y4769002.593), approximately 50 km south-west of Santander city. The expanded hemiplegic succession offered a potentially valuable orbitally paced stratigraphic record. An integrated multiproxy study was performed in the 19 beds found between 12.4 and 15.95 m of the lower Pliensbachian succession in order to disentangle what sedimentary processes and environmental factors influenced the formation of the hemipelagic rhytmites. Sampling was mainly carried out in 2019. Fifty-seven samples were collected in order to analyse their %CaCO3 and inorganic d13Ccarb and d18Ocarb content. The calcimetric analysis was carried out measuring the carbonate percentage in 1 g of powder of each sample, using a FOGL digital calcimeter (BD inventions; accuracy of 0.5%) housed at the University of the Basque Country (UPV/EHU), Bilbao, Spain.本研究公开了产自西班牙伊比利亚古北缘巴斯克-坎塔布里亚盆地桑蒂尔德（Santiurde）剖面普林斯巴阶（Pliensbachian）最底部富有机质半远洋（hemipelagic）沉积序列的碳酸钙数据集。该研究剖面出露于A67高速公路144号出口，地理坐标为UTM X411431.091 Y4769002.593，距桑坦德市西南约50千米。这套完整的半远洋沉积序列蕴含了极具科研价值的轨道旋回调控地层记录。为厘清控制半远洋韵律层（rhytmites）形成的沉积作用与环境因子，研究团队对下普林斯巴阶地层序列中12.4~15.95米层位间的19个岩层开展了综合多指标（multiproxy）研究。采样工作主要于2019年完成，共采集57件样品，用于分析其碳酸钙百分含量以及无机碳酸盐碳同位素（δ13Ccarb）和氧同位素（δ18Ocarb）组成。碳酸盐定量分析通过称取每份样品1克粉末进行，采用FOGL型数字碳酸盐仪（FOGL digital calcimeter，BD inventions公司生产，精度0.5%）完成，该仪器存放于西班牙毕尔巴鄂的巴斯克大学（University of the Basque Country, UPV/EHU）。