RUI:Carbonate Platform and Reef Development in the AlexanderTerrane of Southeastern AK

RUI：阿拉斯加州东南部亚历山大地体的碳酸盐台地和珊瑚礁发育

• 批准号: 9004745
• 负责人: Constance Soja
• 金额: $ 2.88万
• 依托单位: Smith College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-01 至 1992-12-18
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9004745&HistoricalAwards=false
• 关键词: RUI; Carbonate; Platform; Reef; Development

Early to Late Silurian limestones from the Heceta Formation record the earliest occurrence of widespread carbonate deposition in the region and represent the earliest foundation for shallow water platform development within the arc. The excellent preservation of shallow to deep subtidal deposits within the Alexander arc contrasts with the poor preservation of many marine sediments that originated within other island arcs. Hence, these limestones provide important insights into the styles, processes and bathymetry of carbonate deposition in tectonically active areas. Although previously described as having a shallow marine origin, the limestones from the Heceta Formation can be differentiated into shallow water platform, platform margin, and slope facies. Renewal support will enable PI to pursue topics that relate to: (1) the dynamics of reef sedimentation and carbonate platform development within the Alexander arc; (2) physical and biologic controls on stromatolite distribution within the arc; and (3) regional biogeographic correlations. The proposed research will involve field work and laboratory analyses during a two-year period and will generate a model for carbonate platform and reef evolution within a tectonic framework. Results of the proposed research will refine our understanding of Silurian reef evolution and decline in different tectonic settings, factors affecting Phanerozoic stromatolite development, and the paleogeography of the Alexander terrane.

赫塞塔组早至晚志留世灰岩 记录了最早的广泛碳酸盐沉积 代表了最早的浅层地下水基础 弧内水平台开发。 优秀 保护浅到深的潮下带沉积物， 亚历山大弧与许多海洋生物保存不佳形成鲜明对比 其他岛弧内的沉积物。 所以这些 石灰岩提供了重要的见解， 构造活动区碳酸盐沉积和水深测量 地区 虽然之前被描述为有一个浅海 从起源，石灰石从Heceta形成可以是 分浅水台地、台地边缘、 斜坡相 更新支持将使PI能够继续研究主题 这涉及：（1）珊瑚礁沉积的动力学， 亚历山大弧内碳酸盐岩台地发育; 叠层石分布的物理和生物控制 弧内;（3）区域生物地理相关性。 的 拟议的研究将涉及实地工作和实验室分析 在两年的时间里，将产生一个碳酸盐模型， 构造格架内的台地和生物礁演化。 结果 这项研究将使我们更好地了解 志留纪生物礁在不同构造背景下的演化与衰退 环境，影响中生代叠层石发育的因素， 以及亚历山大号的古地理。