Petrology, Porosity Evolution, and Geochemistry of Upper Cambrian and Lower Ordovician Strata in Southern Missouri

密苏里州南部上寒武统和下奥陶统地层的岩石学、孔隙度演化和地球化学

• 批准号: 9104590
• 负责人: Jay Gregg
• 金额: $ 9.94万
• 依托单位: Missouri University of Science and Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1995-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9104590&HistoricalAwards=false
• 关键词: Petrology; Porosity; Evolution; Geochemistry; Upper

Upper Cambrian and Lower Ordovician carbonate rocks of southern Missouri host the major Mississippi Valley-type (MVT) mineral deposits of the region. Additionally, they are the principal fresh water aquifers for the area. This study will investigate: 1) petrology (including porosity and permeability) and 2) geochemistry of these units. This information will be used to interpret the diagenetic history of the region, particularly with regard to regional basin fluid migration that resulted in MVT ore deposits. The study will also evaluate the volume of late diagenetic cements, related to regional mineralization, and estimate porosities and permeabilities prior to the onset of regional mineralization and at various stages during mineralization in southern Missouri. This information will be valuable for modeling basinal fluid flow on the midcontinent during late Paleozoic mineralization, gaining a better understanding of the present day aquifers, and will serve as a useful case study for the understanding of late diagenetic alteration of platform carbonates by basinal fluids.

上寒武统和下奥陶统碳酸盐岩 密苏里州南部是主要的密西西比河谷型（MVT） 该地区的矿产资源。 此外，他们是 该地区的主要淡水含水层。 本研究将 调查：1）岩石学（包括孔隙度和渗透率）和 2)这些单位的地球化学。 此信息将用于 解释该地区的成岩历史，特别是 关于区域盆地流体迁移导致MVT矿 存款 该研究还将评估最近的 成岩胶结物，与区域矿化有关， 估计孔隙度和渗透率之前， 区域成矿和成矿过程中的不同阶段 在密苏里州南部。 这些信息将是有价值的， 模拟中大陆晚期盆地流体流动 古生代成矿作用，更好地了解 今天的含水层，并将作为一个有用的案例研究， 对台地碳酸盐岩晚成岩蚀变的认识 被盆内的液体污染