Carbon isotope (13-C) values for 5 different foraminiferal species down the core of GC12, collected from the Capricorn Channel

A gravity core (GC12) was collected from a depth of 990.5 mbsl within the Capricorn Channel, southern Great Barrier Reef (GBR). 13-C values were recorded for 5 foraminiferal species through the core, with results varying considerably throughout the last 30kyr. The 13-C values of the benthic Cibicidoides spp. are the lowest, whilst those for the planktonic species are comparable, once correlated for their vital effects (except Globorotalia truncatulinoides because no correction for vital effects is available). It is apparent from the 13-C values that there are 3 main 13-C phases during the glacial/interglacial transition: Glacial, Deglaciation and Holocene phases.

研究团队从大堡礁（Great Barrier Reef, GBR）南部的摩羯海峡（Capricorn Channel）海平面下990.5米（mbsl）处采集了一根重力岩芯（GC12）。对该岩芯内5种有孔虫的13-C值进行了测定，结果显示，在过去3万年中，其数值存在显著波动。其中，底栖卷包虫属（Cibicidoides spp.）的13-C值最低；浮游有孔虫类的13-C值经生命效应校正后具有可比性，但截锥圆辐虫（Globorotalia truncatulinoides）除外，因其生命效应校正方法尚未建立。通过13-C值分析可见，冰期-间冰期过渡阶段存在3个主要的13-C阶段：冰期、冰消期及全新世阶段。