(GRGC) Cyclostratigraphy and Carbonate Platform Evolution, Middle Cretaceous, Northeastern Mexico

(GRGC) 墨西哥东北部中白垩纪旋回地层学和碳酸盐台地演化

• 批准号: 9417872
• 负责人: David Osleger
• 金额: $ 6.12万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-02-01 至 1997-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9417872&HistoricalAwards=false
• 关键词: GRGC; Cyclostratigraphy; Carbonate; Platform; Evolution

9417872 Osleger The proposed research intends to investigate the Mid-Cretaceous (Albian) Coahuila carbonate platform of northeastern Mexico, a laterally-extensive, passive-margin platform that represents the final major episode of carbonate sedimentation in the Gulf Coast region. The first objective of the proposed research is to determine the history of Mid-Cretaceous relative sea-level changes at time scales ranging from 104 to 106 years. This aspect of the project will involve the use of high-resolution sequence stratigraphy and cyclostratigraphy to document cross-platform relationships and interpret the temporal evolution of the Coahuila platform. The second objective is to determine the extent to which Milankovitch-scale cyclicity is developed in Albian shallow-marine carbonates of northeastern Mexico; Milankovitch periodicities have been unequivocally recognized in coeval Albian deep-sea sediments in Italy. The third objective is to use the observed field relationships to constrain two-dimensional computer models so that rates, frequencies, and magnitudes of accommodation change through Albian time can be quantitatively estimated for northeastern Mexico. The proposed cyclostratigraphic and sequence stratigraphic research is part of a larger-scale collaborative effort on the Mid- Cretaceous of northeastern Mexico currently underway involving a multidisciplinary team of biostratigraphers and magnetostratigraphers associated with Project Albicore of the Cretaceous Resources, Events and Rhythms working group. The proposed research is expected to result in several major contributions. More precise global correlations of Albian depositional sequences should be possible after the cyclostratigraphic and sequence stratigraphic results are integrated with the refined chronostratigraphic resolution attained by the collaborative researchers. The improved geochronometry, representing the merger of detailed sequence stratigraphy and computer modeling with bio - and magnetostratigraphy, will permit the quantitative estimation of rates and durations of global processes, and enhance interpretations of the regional- to global- scale mechanisms governing sequence deposition (tectonism, eustasy, environmental change). A further application of this interdisciplinary research on the relatively-uninvestigated Coahuila platform is that a new model will be developed for comparison with other Albian platforms worldwide, including the economically-significant carbonate platforms of the Middle East.

9417872 Osleger 拟议的研究旨在调查墨西哥东北部的白垩纪中期（阿尔比亚）科阿韦拉碳酸盐台地，这是一个横向广泛的被动边缘台地，代表了墨西哥湾沿岸地区碳酸盐沉积的最后主要阶段。 拟议研究的第一个目标是确定 104 至 106 年时间尺度内白垩纪中期相对海平面变化的历史。 该项目的这方面将涉及使用高分辨率层序地层学和旋回地层学来记录跨平台关系并解释科阿韦拉平台的时间演化。 第二个目标是确定墨西哥东北部阿尔比亚浅海碳酸盐岩中米兰科维奇尺度旋回的发展程度；米兰科维奇周期性在意大利同时代的阿尔布阶深海沉积物中得到了明确的认可。 第三个目标是利用观测到的场关系来约束二维计算机模型，以便可以定量估计墨西哥东北部阿尔比时间的调节变化率、频率和幅度。 拟议的旋回地层学和层序地层学研究是目前正在进行的墨西哥东北部白垩纪中期更大规模合作项目的一部分，该项目涉及与白垩纪资源、事件和节律工作组 Albicore 项目相关的生物地层学家和磁地层学家组成的多学科团队。 拟议的研究预计将产生几项重大贡献。 在将旋回地层和层序地层结果与合作研究人员获得的精确年代地层分辨率相结合后，应该可以对阿尔布沉积层序进行更精确的全球相关性。 改进的地球测时学代表了详细的层序地层学和计算机建模与生物和磁性地层学的合并，将允许定量估计全球过程的速率和持续时间，并增强对控制层序沉积（构造作用）的区域到全球尺度机制的解释。 、 eustasy、环境变化）。 这项跨学科研究在相对未经调查的科阿韦拉平台上的进一步应用是，将开发一个新模型，用于与世界各地其他阿尔比安平台进行比较，包括中东具有重要经济意义的碳酸盐岩平台。