A Tectonic Map of the Caloris Basin, Mercury

Mapping was carried out on the 166 m/pix Mercury Dual Imaging System (MDIS) monochrome morphology mosaic, supplemented by the high incidence angle mosaics with west and east illumination. Structure mapping was carried out on varying mapping scales to capture both fine and coarse details. Polyline shapefiles were created in ArcGIS 10.8. Vertices were placed at visible endpoints (tips) of structures or wherever changes in orientation were visible in the image data along the length of the structures. Basin Outline: Demarks the boundary separating Caloris interior and exterior geological units. Where clearly discernible, this outline traces the basin rim. In places, the rim was not well defined and, in those instances, areas separating high-standing terrain from low-lying terrain were inferred to outline the basin. Basin Structures: Ridges indicate the crests of, or surface breaks associated with positive-relief landforms that are linked to shortening. Graben mark the surface break of negative-relief landforms that are linked to extension. This map was discussed in: Byrne, P. K., Klimczak, C., and Şengör, A. M. C.: The Tectonic Character of Mercury. In: Solomon, S. C., Nittler, L. R., and Anderson, B. J.: Mercury: The View after MESSENGER (Chapter 10), 249–286, 2018, Cambridge Planetary Science.本研究以分辨率为166米/像素的水星双成像系统（Mercury Dual Imaging System, MDIS）单色形态拼接图为基础开展制图工作，并辅以西向、东向照明的高入射角拼接影像。构造制图采用多尺度制图策略，以同时捕捉精细与宏观构造细节。研究于ArcGIS 10.8软件中创建折线型形状文件（shapefile），在构造的可见端点（尖端）或沿构造延伸方向影像中可见的走向变化处放置顶点。 盆地轮廓：用于界定卡路里盆地内部与外部地质单元的边界。在边界清晰可辨的区域，该轮廓沿盆地环壁绘制；在部分环壁界定模糊的区域，则通过区分高地势与低地势区域的界线推断盆地轮廓。 盆地构造：脊线代表与挤压作用相关的正地形地貌的脊顶或地表破裂；地堑则代表与拉伸作用相关的负地形地貌的地表破裂。 本图集的相关讨论参见：Byrne, P. K.、Klimczak, C.与Şengör, A. M. C.所著《水星的构造特征》，收录于Solomon, S. C.、Nittler, L. R.与Anderson, B. J.主编的《信使号任务之后的水星观测》（第10章），剑桥行星科学系列，第249-286页，2018年。