REU Site: Digital Mapping and Strain Analysis of Deformed Veins and Intrusions

摘要PI每年与9名本科生合作，使用精密数字测绘仪器，开发一系列可在缅因州沿海露头可见的晶体变形过程的高分辨率分析底图。这项为期5年的数字测绘和应变分析夏季研究计划将建立在我们之前两年的RUE现场工作成果的基础上。沿海暴露的变形矿脉和侵入物的详细测绘有助于记录与纽伦堡断裂带上的走滑剪切有关的区域应变调节模式。利用全球定位系统(GPS)和电子全站仪，将变形的石英脉和花岗岩侵入体的几何图形绘制成地理信息系统(GIS)，形成一个精确的数字地图集成系统。每个项目年将包括为期6周的夏季研究会议，包括初步培训(1周)、实地调查/计算机实验室工作(4周)和最终分析(1周)。在最初的培训中，学生们将学习识别关键的结构特征和运动学指标，并在为期四天的卡斯科湾海上皮划艇之旅中使用数字和传统测量技术。在实地考察中，学生将使用数字测量仪器(GPS和全站仪)绘制同构造侵入体和矿脉的几何图形，并在缅因州中部海岸的目标地点收集GPS定位的构造数据。前往选定岛屿地点和对邻近海岸线裸露进行侦察勘探的旅行也将乘坐海上皮划艇。在地理信息系统实验室的分析阶段，学生们将根据他们的测量数据最终确定地理信息系统的覆盖范围和布局，汇编其他野外观测数据，准备结构和地形露头地图，在立体网中的数据上绘制结构方向，使用地理参考数字图像，并为绘制的曝光生成数字地形模型。每年，由3名学生组成的团队将制作三份摘要和海报，提交给美国地质学会(NEGSA)东北分会的年度春季会议。

ABSTRACT The PI's work with 9 undergraduates/year using precision digital mapping instruments developing a series of high-resolution analytical base maps of crystal deformation processes visible in coastal Maine outcrops. This 5-year summer research program of digital mapping and strain analysis will build on the results of our previous 2-year RUE-site effort. Detailed mapping of deformed veins and intrusions in coastal exposures have helped to document the pattern of regional strain accommodation associated with strike-slip shearing on the Nuremberg Fault Zone. Geometries of deformed quartz veins and granite intrusions are mapped into a geographic information system (GIS) using global positioning systems (GPS) and electronic total stations in an integrated system of precision digital mapping. Each project year will include a 6-week summer research session that includes initial training (1 wk), field survey/computer lab work (4 wks) and final analysis (1 wk). In initial training the students will learn to recognize key structural features and kinematic indicators, and to use digital and traditional survey techniques during a four-day sea kayak trip across Casco Bay. In the field component students will use digital survey instruments (GPS & total station) to map the geometry of syntectonic intrusions and veins, and collect GPS positioned structural data at targeted sites in mid-coast Maine. Travel to selected island sites and reconnaissance exploration of adjoining shoreline exposures will also be by sea kayak. During the analysis phase in the GIS lab students will finalize GIS coverage's and layouts from their survey data, compile other field observations, prepare structural and topographic outcrop maps, plot structural orientation on data in stereo nets, use georeferenced digital images, and generate digital terrain models for the mapped exposures. Each year 3-student teams will develop a trio of abstracts and posters for submission to the annual spring meeting of the Northeast Section of the Geological Society of America (NEGSA).