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.

本次采集的重力岩心（gravity core）GC14，采自大堡礁（Great Barrier Reef，GBR）南部摩羯海峡（Capricorn Channel）内海平面以下2004米（meters below sea level，mbsl）处。研究人员从红拟抱球虫（Globigerinoides ruber）壳体中获取了氧18（¹⁸O）与碳13（¹³C）同位素值，并将其与SPECMAP年代模型进行关联对比。该岩心的沉积序列可回溯至海洋同位素阶段3（Marine Isotope Stage，MIS 3）。由于仅能通过与Martinson等人（1987年）提出的SPECMAP年代模型开展有限的深度匹配，因此极难精确确定其沉积速率；不过该岩心整体的沉积速率相对均一，约为4厘米每千年（cm/kyr）。对于这类远岸深渊环境的岩心而言，该沉积速率属于相对较高的水平。