Recollecting and Drilling Emerged Coral Reefs on the Huon Peninsula, Papua New Guinea

巴布亚新几内亚休恩半岛的珊瑚礁采集和钻探

• 批准号: 8804970
• 负责人: Arthur Bloom
• 金额: $ 10万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-07-01 至 1990-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8804970&HistoricalAwards=false
• 关键词: Recollecting; Drilling; Emerged; Coral; Reefs

Reef terraces on the Huon Peninsula of Papua New Guinea were the basis of a series of studies beginning in the early 1970's that gave impetus to the use of coral reefs to date ice ages. The tectonic uplift rate on the Huon Peninsula is so rapid (1 to 4 mm/yr) that many of the lesser fluctuations of sea level within the last ice age are recorded by small, partly overlapping reefs. This project represents major recollecting effort in collaboration with Australian scientists and a group of international experts, because few samples are now available from the Huon terraces. Also, drill cores through the youngest, Holocene, reef and a selected set of older reefs will define the rate and amplitude of sea-level changes and climatic fluctuations during the last ice age. Newly developed analytical techniques of mass-spectrometric Uranium-series dating and electron spin resonance (ESR) dating offer unprecedented precision and a longer time range for dating emerged coral reefs on uplifting tropical coasts. Unweathered, fresh coral samples are essential to both techniques. Coral-reef growth is closely controlled by sea-level fluctuations, which in turn are governed by the expansion and shrinkage of continental ice sheets. Thus, precise dates on corals from the Huon Peninsula, comparable to recently published mass-spectrometer Uranium-series ages in the range of 125,700 + 1200 years for corals from Barbados, will open a new era of precision for dating ice ages and their concomitant changes in sea levels. The new methods will permit a rigorous test of the Milankovitch theory of ice ages and more accurate comparison with the deep-sea isotope record.

巴布亚新几内亚胡翁半岛上的珊瑚礁阶地 20世纪70年代初开始的一系列研究的基础 这推动了利用珊瑚礁来测定冰河时代的日期。 的 休恩半岛的构造隆升速度非常快（1 ~ 4 毫米/年），许多较小的海平面波动， 最后一次冰河时代是由小的，部分重叠的珊瑚礁记录的。 这个项目代表了合作的主要回忆努力 与澳大利亚科学家和一组国际专家一起， 因为现在休恩阶地的样本很少。 此外，通过最年轻的，全新世，珊瑚礁和 选定的一组较老的珊瑚礁将确定 末次冰期的海平面变化和气候波动 年龄 质谱分析新技术 铀系测年和电子自旋共振测年 提供了前所未有的精确度和更长的时间范围 在上升的热带海岸出现了珊瑚礁 未经风化， 这两项技术均需要新鲜珊瑚样本。 珊瑚礁 增长受到海平面波动的密切控制， 转向是由大陆的扩张和收缩所控制的 冰原 因此，休恩河珊瑚的精确年代 半岛，与最近公布的质谱仪相当 铀系年龄在125，700 + 1，200年之间， 来自巴巴多斯的珊瑚，将开启精确年代测定的新时代 冰河时代及其伴随的海平面变化。 新 方法将允许米兰科维奇理论的严格测试， 冰河时代和更精确的深海同位素比较 记录