Depositional Cycles, Diagenesis and Composite Sea Level Changes in Platform Carbonates of the Alpine Triassic

高山三叠系台地碳酸盐岩的沉积旋回、成岩作用及复合海平面变化

• 批准号: 8816638
• 负责人: Lawrence Hardie
• 金额: $ 10.31万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-06-01 至 1991-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8816638&HistoricalAwards=false
• 关键词: Depositional; Cycles; Diagenesis; Composite; Sea

Shallow water carbonate deposits typically were deposited episodically at the meter-scale in the frequency range of 104-105 years. The proposed research will increase our understanding of the origin and significance of this stratigraphic cyclicity, using the superb exposures of Triassic carbonates in the Alps as natural field laboratories. Earlier work has demonstrated that composite eustatic sea level changes with Milankovitch periodicities played a fundamental role in the cyclical deposition of these Triassic carbonates. The research will attempt, by careful field and laboratory study of the sedimentology, diagenesis and stratigraphy of a spectrum of Alpine Triassic carbonates, to extend this early work to bridge the gap between high frequency meter-scale cyclicity (104-105 year) and the much larger 3rd order scale (106 year) depositional cycles that are the fundamental units of both seismic and sequence stratigraphy. If the response of shallow water carbonates (which are reliable sea level gauges) to the interaction of composite 104, 105 and 106 year sea level cycles, subsidence, and sedimentation can be predicted (or at least understood), then we will have a powerful tool for use in stratigraphic correlation, chronostratigraphy and sequence stratigraphy at an outcrop or borehole core scale finer than that detectable by current seismic stratigraphic methods. Such information would have obvious value in the exploration for hydrocarbon reservoirs and hydrothermal ore deposits that are so commonly hosted in shallow water carbonate deposits.

浅水碳酸盐沉积物通常是 在104-105的频率范围内， 年 拟议的研究将增加我们对 这种地层旋回性的成因和意义， 利用阿尔卑斯山三叠纪碳酸盐岩的极好暴露， 自然实验室 早期的研究表明， 米兰科维奇海平面变化 周期性在周期性的 这些三叠纪碳酸盐的沉积。 这项研究将 通过仔细的实地和实验室研究， 沉积学，成岩作用和地层学的一系列 阿尔卑斯山三叠纪碳酸盐岩，将这一早期工作扩展到桥梁 高频米级循环（104-105）之间的差距 年）和更大的三级沉积（106年） 周期是地震和 层序地层 如果浅水区的反应 碳酸盐（可靠的海平面计） 复合104、105和106年海平面周期相互作用， 沉降和沉积可以预测（或至少 我们将拥有一个强大的工具， 地层对比、年代地层和层序 露头或钻孔岩心的地层比 可被现有的地震地层学方法探测到。 等 信息将在探索中具有明显的价值， 油气藏和热液矿床， 通常存在于浅水碳酸盐沉积物中。