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

摘要 PI的工作与9个本科生/年使用精密数字测绘仪器开发一系列高分辨率的分析基础地图的晶体变形过程中可见的沿海缅因州露头。 这个为期5年的夏季数字测绘和应变分析研究项目将建立在我们之前2年的RUE现场工作的基础上。 详细绘制海岸暴露的变形矿脉和侵入体有助于记录与纽伦堡断层带上的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图形绘制到地理信息系统（GIS）中，形成精密数字制图的综合系统。 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）。 在初步培训中，学生将学习识别关键的结构特征和运动学指标，并在为期四天的卡斯科湾海上皮艇之旅中使用数字和传统测量技术。 在现场部分，学生将使用数字测量仪器（GPS全站仪）绘制同构造侵入体和矿脉的几何形状，并收集缅因州中海岸目标地点的GPS定位结构数据。 前往选定的岛屿地点和邻近海岸线暴露的侦察勘探也将乘坐海上皮艇。 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，编译其他实地观察结果，准备结构和地形露头图，在立体网络中绘制数据结构方向，使用地理参考数字图像，并为映射曝光生成数字地形模型。 每年3个学生团队将开发三个摘要和海报提交给美国地质学会（NEGSA）东北部的年度春季会议。

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).