Diagenetic Record of Transgressive Regressive Events

研究者建议研究成岩作用的变化， 海进-海退沉积序列 这种系统性 研究将包括三个主要部分：a）详细的地球化学 海进海退的岩相学特征 北方波多黎各第三系层序; B）地球化学 海侵-海退成岩环境建模， 约束模型的经验数据;以及c）详细的 古生界层序的地球化学和岩相学研究 北美中部大陆，以测试这种 古生代第三纪类似物的模型和实用性。 岩石学特征将包括常规的 抛光板和薄片的岩相学检查， 双目显微镜和偏光显微镜的检验 用阴极射线发光的抛光薄板和薄片 和荧光显微镜，以及扫描电子显微镜检查 显微镜 选择的地球化学特征 组件将包括微量、痕量和超痕量元素 碳和氧稳定同位素组成， 87 Sr/86 Sr测定。 建模将包括地球化学 流体化学和矿物稳定性的模拟 评估系统的热力学限制，以及 成岩作用-海平面振荡模型， 地质记录中可能出现的场景。

The investigator proposes to study diagenetic modifications in transgressive-regressive depositional sequences. This systematic study will include three major components: a) detailed geochemical and petrographic characterization of transgressive-regressive Tertiary sequences of Northern Puerto Rico; b) geochemical modelling of transgressive-regressive diagenetic settings using the empirical data to constrain models; and c) detailed geochemical and petrographic study of a Paleozoic sequence in the central North American midcontinent to test applicability of such models and usefulness of Tertiary analogues for the Paleozoic. Petrographic characterization will include conventional petrographic examination of polished slabs and thin sections under binocular microscopes and polarizing microscopes, examination of polished thin slabs and thin sections using cathodoluminescence and fluorescence microscopy, and examination by scanning electron microscopy. The geochemical characterization of selected componenets will include minor, trace and ultra-trace element determinations, carbon and oxygen stable isotope compositions and 87Sr/86Sr determinations. Modelling will include geochemical modelling of fluid chemistry and mineral stability of the systems to assess the thermodynamic limitations of the system, and diagenesis-sea level oscillation models to evaluate a broad range of scenarios that could be present in the gologic record.