Mineralogy, rare earth elements, and strontium isotopic composition of phosphorites and phosphatized rocks from the Rio Grande Rise, south Atlantic Ocean

Phosphorites and phosphatized rocks from the summit of the Rio Grande Rise were collected via dredge during the oceanographic research cruise RGR1 to the western RGR. The location (latitude, longitude, depth), mineralogy, concentrations of phosphorus and rare earth elements, and 87Sr/86Sr ratios of phosphorites and phosphatized FeMn crusts, ironstones and carbonates from 10 dredge sites are presented here. These data were used to determine the presence of carbonate fluorapatite in different rock types, the age of carbonate fluorapatite and the characteristics of the phosphatizing fluid.

本研究在针对西部里奥格兰德海隆（Rio Grande Rise，简称RGR）执行的RGR1号海洋考察航次中，采用拖网采样法采集了里奥格兰德海隆峰顶的磷灰岩（Phosphorites）与磷酸岩化岩石（phosphatized rocks）。本文公开了10个拖网采样点处的磷灰岩、磷酸岩化铁锰（FeMn）结壳、铁质岩及碳酸盐岩的位置信息（纬度、经度、水深）、矿物学特征、磷与稀土元素（rare earth elements）含量，以及87Sr/86Sr同位素比值。本数据集所载数据可用于判定不同岩石类型中碳酸盐氟磷灰石（carbonate fluorapatite）的赋存状态、碳酸盐氟磷灰石的形成时代，以及磷酸岩化流体的特征。