Pleistocene development and facies of southern Belize shelf and barrier reef

伯利兹南部陆架和堡礁更新世发育及相

• 批准号: 50152196
• 负责人: Professor Dr. Eberhard Gischler
• 金额: --
• 依托单位: Arbeitsgruppe Biosedimentologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/50152196?language=en
• 关键词: Pleistocene; development; facies; southern; Belize

A sedimentological and stratigraphical study of six existing cores (total of’527 m rock penetration) from the southern Belize shelf and barrier reef would greatly enhance the understanding of late Quaternary development of this major reefal margin. Using facies analysis and radiometric dating it is intended to interpret the succession in the light of Pleistocene sea-level and climate fluctuations. I expect to identify packages of Pleistocene reef limestones, which accumulated during sea-level highstands, separated by subaerial exposure surfaces and/or siliciclastic deposists that formed during sea-level lowstands. Major questions refer to the nature of the Pleistocene antecedent topography and the timing of the start of barrier reef formation. There are indications that major barrier reef systems such as Belize, Florida, or the Australian Great Barrier Reef are comparably young, late Pleistocene features, initiated only during the exceptionally long and warm MIS (marine isotope stage) 11.

对伯利兹南部陆架和堡礁现有的6个岩芯(总岩石渗透率为527m)进行沉积学和地层学研究，将极大地提高对这一主要礁缘晚第四纪发育的认识。利用相分析和放射性测年方法，结合更新世海平面和气候的波动特征来解释层序。我希望能确定更新世生物礁石灰岩的包体，这些石灰岩在海平面高水位时聚集，被海平面低水位期间形成的水下暴露表面和/或硅质碎屑沉积隔开。主要问题涉及更新世先行地形的性质和堡礁形成的开始时间。有迹象表明，主要的堡礁系统，如伯利兹、佛罗里达或澳大利亚大堡礁，都是相对年轻的晚更新世特征，仅在异常漫长和温暖的海洋同位素阶段11开始。