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

PI与9名本科生/年合作，使用精密数字测绘仪器开发了一系列缅因州沿海露头可见晶体变形过程的高分辨率分析基础图。这个为期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2年的rue站点工作的结果之上。对沿海暴露的变形脉体和侵入体的详细测绘有助于记录与纽伦堡断裂带走滑剪切相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，将变形石英脉和花岗岩侵入体的几何形状映射到地理信息系统（GIS）中，形成了一个精密数字测绘综合系统。每个项目年将包括一个为期6周的夏季研究会议，包括初始培训（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，并在为期四天的海上皮艇穿越卡斯科湾期间使用数字和传统的测量技术。在野外部分，学生将使用数字测量仪器（GPS全站仪）绘制同构造侵入体和脉的几何形状，并在缅因州中部海岸的目标地点收集GPS定位的结构数据。前往选定的岛屿地点和侦察勘探邻近的海岸线暴露也将由海上皮艇。在GIS实验室的分析阶段，学生将根据他们的调查数据最终确定GIS覆盖范围和布局，编写其他实地观察，准备结构和地形露头图，在立体网数据上绘制结构方向，使用地理参考数字图像，并为地图曝光生成数字地形模型。每年，3名学生组成的团队将制作一组摘要和海报，提交给美国地质学会东北分会（NEGSA）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).