Stable Isotope Stratigraphy of the Miocene Monterey Formation, California: Testing the Monterey Hypothesis

加利福尼亚州中新世蒙特利组的稳定同位素地层学：检验蒙特利假说

• 批准号: 9218738
• 负责人: James Kennett
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-01-15 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9218738&HistoricalAwards=false
• 关键词: Stable; Isotope; Stratigraphy; Miocene; Monterey

PI will conduct sedimentologic, stable isotopic and biostratigraphic studies of the Naples Beach exposure of the Miocene Monterey Formation, California. Monterey Formation deposition occurred over a significant interval of global change, and the preservational quality of the Naples Beach section represents an important opportunity for obtaining detailed paleoenvironmental records. The sequestering of great quantities of organic carbon in the Monterey Formation and correlative deposits around the Pacific Rim has been linked to an early to middle Miocene increase in deep-sea 13C, and to global cooling through drawdown of pCO2, termed the "Monterey Hypothesis". The proposed work will test a corollary of the Monterey Hypothesis by evaluating the synchroneity between intervals of enhanced organic-rich deposition in the Monterey Formation and deep-sea 13C maxima, which requires better age control than the existing biostratigraphy and chemostratigraphy provide. Stable isotopic stratigraphy has the potential for direct comparison of intervals of organic- rich deposition with 13C maxima in the Naples Beach record, or for correlation to deep-sea 13C maxima. Central questions which the proposed work will address are: Can stable isotopic stratigraphy enhance international correlation of the Monterey Formation and aid in testing the Monterey Hypothesis? What is the relationship between sedimentary sequences in marginal basins of the Pacific Rim to global paleoceanographic changes? PI will develop a stable isotopic stratigraphy and a detailed paleoenvironmental history based on quantitative analysis of benthic foraminiferal faunas. integration of the resulting faunal and stable isotopic time series with sedimentologic information will greatly enhance correlation to Miocene sequences of the Pacific Rim and illuminate the relationship between organic-rich deposition and global oceanographic events in the early to middle Miocene.

PI将对加利福尼亚州中新世蒙特雷组的那不勒斯海滩暴露于加利福尼亚州中新世的那不勒斯海滩暴露。蒙特雷的形成沉积发生在全球变化的显着间隔内，那不勒斯海滩区的防腐剂质量代表了获得详细的古环境记录的重要机会。在蒙特雷形成中大量有机碳和太平洋缘附近的相关沉积物的隔离与深海13C中的早期中新世的增加有关，并通过称为“蒙特雷假设”的PCO2的全球冷却。所提出的工作将通过评估蒙特利形成中增强的有机富集沉积间隔与深海13C最大值的增强的有机富集沉积间隔之间的同步性来检验蒙特雷假设的必然性，这比现有的生物层学和化学术提供了更好的年龄控制。稳定的同位素地层学具有直接比较那不勒斯海滩记录中有机富含沉积的间隔与13C最大值的间隔，或与深海13C最大值的相关性。拟议工作将解决的主要问题是：稳定的同位素地层学可以增强蒙特利形成的国际相关性并有助于检验蒙特利假设吗？太平洋边缘边缘盆地中的沉积序列与全球古文化变化之间的关系是什么？ PI将基于对底栖有孔虫动物区系的定量分析，发展稳定的同位素地层和详细的古环境史。所得的动物和稳定的同位素时间序列与沉积学信息的整合将极大地增强与太平洋边缘的中新世序列的相关性，并阐明中新世早期至中新世的有机富集沉积与全球海洋学事件之间的关系。