Age vs Depth profile of core GC14, collected from the Capricorn Channel off the Eastern Australian Coast

A gravity core (GC14) was collected from a depth of 2004 mbsl within the Capricorn Channel, southern Great Barrier Reef (GBR). Isotopic values for 18-O and 13-C were obtained from : Globigerinoides ruber and correlated with the SPECMAP age-model. It appears that the core extends back to MIS 3 (Marine Isotope Stage). From limited depth matching with the Martinson et al. (1987) SPECMAP age-model it is extremely difficult to determine a sedimentation rate, however, it exhibits a relatively uniform rate throughout the core of ~4cm/kyr. This is a fairly high sedimentation rate for a core this distal and abyssal.

本研究于大堡礁南部摩蝎海峡（Capricorn Channel）内海平面以下2004米（meters below sea level，mbsl）处采集了一根重力岩芯（GC14）。研究人员从红拟抱球虫（Globigerinoides ruber）壳体中提取了氧18（¹⁸O）与碳13（¹³C）的同位素组成数据，并将其与SPECMAP年代模型（SPECMAP age-model）进行年代关联。结果表明，该岩芯的沉积序列可回溯至海洋同位素阶段3（Marine Isotope Stage，MIS 3）。由于仅能与马丁森等（1987）提出的SPECMAP年代模型进行有限的深度层位匹配，因此极难准确确定其沉积速率；不过全岩芯的沉积速率相对均一，约为4厘米/千年。对于这类远源深海岩芯而言，该沉积速率属于较高水平。