The percentage of calcium carbonate in samples taken from various depths in core GC09, located in the Capricorn Channel.

A gravity core (GC09) was collected from a depth of 166m within the Capricorn Channel, southern Great Barrier Reef (GBR). The percentage of calcium carbonate in samples collected from different depths was analysed, along with other parameters, to determine changes in carbonate mineralogy and terrestrial influx. The lowest percentage of calcium carbonate was recorded at ~60cm depth corresponding to the Last Glacial Maximum (LGM). The increase in the percentage of silt and mud during the LGM relates to a reduction in bioclastic carbonate production.

研究人员从大堡礁（Great Barrier Reef, GBR）南部的摩羯水道（Capricorn Channel）水深166米处采集了重力岩心（gravity core）GC09。对不同深度的样品开展了碳酸钙百分含量及其他多项参数的分析，以明确碳酸盐矿物学特征变化与陆源输入量的演化规律。在约60厘米深度处测得最低碳酸钙百分含量，该层位对应末次冰盛期（Last Glacial Maximum, LGM）。末次冰盛期期间粉砂与泥质组分占比的升高，与生物碎屑碳酸盐产出量的降低存在相关性。