Great Barrier Reef Coral and Halimeda Cd/Ca Ratios: Holocene Paleochemical Records

镉钙比例将在珊瑚中测定， 全新世生物礁中沉积绿色盐藻的文石 和澳大利亚大堡礁的生物礁。 的 目的是：（1）确定全新世Cd/Ca的变化 外大陆架珊瑚礁的比率，包括珊瑚礁 起始8500 ybp到代表背风的岩心中的存在 到个别珊瑚礁的迎风环境， （2）确定不同纬度的变化; 全新世大堡礁Cd/Ca比值的季节性 珊瑚，比较当代和选定的历史珊瑚; (3)为了确定大湖区全新世Cd/Ca比值的变化， 大堡礁Halimeda生物礁，从开始（2000年以前 珊瑚礁的起源）至今;及 (4)解释珊瑚和仙掌藻的Cd/Ca记录， 关于改变营养供应的作用的假说 控制着大堡礁的全新世珊瑚礁和生物礁的生长 礁 将认真注意查明和 隔离痕量元素信号，由于地面，而不是 海洋学的影响和改变。 石墨炉 火焰原子吸收分光光度法 测定Cd/Ca、Mn/Ca、Sr/Ca和Mg/Ca比值; X射线 衍射光谱学将用于确定矿物学。

Cadmium.to.calcium rations will be determined in corals and in the aragonite.depositing green alga Halimeda in Holocene reefs and bioherms from the Great Barrier Reef, Australia. The objectives are: (1) to determine Holocene variations in Cd/Ca ratios in outer shelf coral reefs, including records from reef initiation 8500 ybp to the present in cores representing leeward to windward environments in individual reefs and from reefs spanning a range of latitudes; (2) to determine variations in seasonality in Cd/Ca ratios in Holocene Great Barrier Reef corals, comparing contemporary and selected historical corals; (3) to determine Holocene variations in Cd/Ca ratios in Great Barrier Reef Halimeda bioherms, from initiation (.2000 y before coral reef initiation in the same latitude) to the present; and (4) to interpret Cd/Ca records from coral and Halimeda to test hypotheses about the role of changing nutrient supply in controlling Holocene reef and bioherm growth in the Great Barrier Reef. Careful attention will be given to identifying and isolating trace element signals due to terrestrial, rather than oceanographic influences, and to alteration. Graphite furnace and flame atomic absorption spectrophotometry will be used to determine Cd/Ca, Mn/Ca, Sr/Ca, and Mg/Ca ratios; X.ray diffraction spectroscopy will be used to determine mineralogy.