(Table 1) Bulk carbonate content of ODP Hole 194-1198A sediments, east of the Great Barrier Reef@en

Upper Quaternary sediment sequences east of the Great Barrier Reef are characterized by alternating siliciclastic- and carbonate-rich horizons caused by changes in the input of various sedimentary components and reflected in cores by variations in bulk carbonate content. A total of 153 measurements of bulk carbonate content were determined using the carbonate-bomb technique for late Pleistocene sediments between 0 and 23.69 meters below sea floor (mbsf) in Ocean Drilling Program Hole 1198A. Average sample resolution was 15 cm and multiple analyses were performed on each sample. Bulk carbonate content ranges from a maximum of 94 wt% at 13.63 mbsf to a minimum of 73 wt% at 14.54 mbsf. Five cyclic trends are observed that may relate to five major glacial events during the last 500 k.y. of the Quaternary.大堡礁东侧的第四纪上层沉积序列以硅质碎屑富集层与碳酸盐富集层互层为典型特征，该特征源于各类沉积组分的输入量变化，并可通过岩心的总碳酸盐含量（bulk carbonate content）变化得到反映。本数据集针对大洋钻探计划（Ocean Drilling Program）1198A钻孔中海底以下0至23.69米（mbsf）范围内的晚更新世沉积物，采用碳酸盐弹法（carbonate-bomb technique）共计完成153次总碳酸盐含量测定。样品平均分辨率为15厘米，且对每个样品均开展了多次重复分析。总碳酸盐含量的变化范围为73 wt%至94 wt%，其中最大值94 wt%出现在13.63 mbsf处，最小值73 wt%出现在14.54 mbsf处。本次研究观测到5个周期性变化趋势，其或与第四纪过去50万年以来的5次主要冰期事件存在关联。