Operation Basement: Missouri Precambrian Sample Database

In 1968, the Missouri Geological Survey (MGS) established the Operation Basement program to address three objectives: a) to obtain drill hole and underground mining data relative to the structure and composition of the buried Precambrian basement; b) to expand mapping in the Precambrian outcrop area and conduct research related to Precambrian geology and mineral resources; and c) to eventually publish the results of the first two objectives in the Contribution to Precambrian Geology series (Kisvarsanyi, 1976). The database presented here represents the first of those objectives, and it includes more data that was gathered after the third objective was accomplished. It was originally compiled in close cooperation with exploration and mining companies operating in Missouri, who provided drillhole data, core and rock samples to MGS. These data enabled geologists to study otherwise unexposed basement rocks from a large area of the state for the first time, allowing better classification and understanding of the Precambrian basement across the state. MGS is continuing data collection and database compilation today as information becomes available, furthering our knowledge of the Missouri Precambrian basement. This effort was supported through a cooperative agreement with the Mineral Resource Program of the U.S. Geological Survey. There is no plan to update this Data Release product.1968年，密苏里地质调查局（Missouri Geological Survey, MGS）启动了基底作业计划（Operation Basement），旨在达成三项核心目标：a）收集与埋藏型前寒武纪基底（Precambrian basement）的构造特征及物质组成相关的钻孔（drill hole）与地下采矿数据；b）拓展前寒武纪露头区的地质填图工作，并开展针对前寒武纪地质与矿产资源的相关研究；c）最终将前两项任务的研究成果发表于《前寒武纪地质研究贡献》系列丛书（Kisvarsanyi, 1976）。 本次发布的数据库对应上述第一项目标，且纳入了第三项目标完成后新增的多组数据。该数据库最初由密苏里州境内运营的勘探与采矿企业紧密协作编制，这些企业向MGS提供了钻孔数据、岩心及岩石样本。 上述数据首次为地质学家提供了研究该州大范围此前未出露基底岩石的契机，推动实现了对全州范围内前寒武纪基底的更精准分类与深度认知。时至今日，MGS仍在持续收集数据并推进数据库的编制工作，以纳入新获取的信息，进一步深化我们对密苏里州前寒武纪基底的认识。 本项目依托与美国地质调查局矿产资源项目达成的合作协议得以实施。本次数据发布产品暂无更新计划。