Gulf Coast Basinal Mudstones: Sources or Sinks for Diagenetic Components?

泥岩构成了沉积盆地的大部分填充物， 但它们是所有沉积岩中了解最少的。 他们 几乎所有的反应都被“归咎于”， 根据对其他岩石的研究， 比如说， 它们被认为是铅锌矿的矿源， SiO2、Fe++和Mg+，而H+则为 砂岩的地下浸出。 现有数据， 墨西哥湾沿岸新生代剖面对所有这些推论都提出了异议。 利用现有的钻屑，我们建议表征 全岩主要和次要元素（特别是Sr、Ba、B和 元素和同位素（特别是O、Sr、B和Li）化学，2） 碳酸盐矿物学和地球化学; 3）长石矿物学和 地球化学; 4）石英形态与地球化学。 我们将 定量记录南部泥岩随深度的变化 德克萨斯州有大量的砂岩岩相学数据， 地球化学和地层水地球化学已经存在。 通过研究生长断层沉积中心的倾斜剖面， 我们就能最小化局部和时间限制的 沉淀 这一领域的定量材料平衡将 使我们能够评估泥岩成岩作用对 沉积盆地的成岩演化， 基础进口形式和覆盖出口形式的数量 地层。

Mudstones constitute most of the fill of sedimentary basins, yet they are the least understood of all sedimentary rocks. They are "blamed" for virtually all reactions that cannot be easily explained, based on the examination of other rocks. For example, they have been advanced as sources for Pb-Zn mineralization, for SiO2, Fe++, and Mg+ in sandstone cements, and for H+ for subsurface leaching of sandstones. Currently available data in Gulf Coast Cenozoic sections dispute all these inferences. Using available drill cuttings, we propose to characterize changes in: 1) whole-rock major and minor (esp. Sr, Ba, B, and Li) elemental and isotopic (esp. O, Sr, B, and Li) chemistry, 2) carbonate mineralogy and geochemistry, 3) feldspar mineralogy and geochemistry, and 4) quartz morphology and geochemistry. We will quantitatively document changes in mudstones with depth in South Texas where extensive data on sandstone petrography and geochemistry, and formation water geochemistry, already exist. By studying a dip section through the growth-faulted depocenters, we can minimize the vagaries of local and temporally restricted sedimentation. Quantitative material balances in this area will enable us to assess the importance of mudstone diagenesis to the diagenetic evolution of sedimentary basins and assess the magnitude of import form underlying and export to overlying strata.