Boundary of the southwestern Nevada volcanic field from Laczniak and others (1996), for the Death Valley regional ground-water flow system study, Nevada and California

This digital data set defines the boundary of the southwestern Nevada volcanic field (SWNVF), an area of thick, regionally distributed volcanic rocks within the Death Valley regional ground-water flow system (DVRFS), a 100,000-square-kilometer region of southern Nevada and California. The SWNVF boundary encompasses an approximate 12,000 square-kilometer region and is based on a map of hydrogeologic controls on ground-water flow by Laczniak and others (1996). The SWNVF is characterized in part by a thick section of regionally distributed welded tuffs derived from a central complex of nested calderas that erupted from about 16 Ma to 5 Ma. The SWNVF boundary defines the extent of these particular volcanics and was used to distinguish material property zones in the DVRFS. These zone arrays are used as input to the DVRFS transient ground-water flow model, a regional-scale model developed by the U.S. Geological Survey (USGS) for the U.S. Department of Energy (DOE) to support investigations at the Nevada Test Site (NTS) and at Yucca Mountain, Nevada (see "Larger Work Citation", Chapter A, page 8, for details).

本数字数据集界定了内华达州西南部火山岩区（Southwestern Nevada Volcanic Field, SWNVF）的边界。该区域属于死亡谷区域地下水流系统（Death Valley Regional Ground-water Flow System, DVRFS）内广泛分布的厚层火山岩分布区，而DVRFS是覆盖内华达州南部与加利福尼亚州的10万平方千米区域。SWNVF边界涵盖约12000平方千米的范围，其划定依据为Laczniak等（1996）发布的控制地下水流的水文地质条件专题图。SWNVF的典型特征之一，是一套源自嵌套破火山口中心复合体的厚层区域分布熔结凝灰岩，该复合体的喷发时段约为16百万年（Ma）至5百万年（Ma）前。SWNVF边界界定了这类特定火山岩的分布范围，曾被用于划分DVRFS内的物质属性分区。上述分区数组被用作DVRFS瞬态地下水流模型的输入数据；该区域尺度模型由美国地质调查局（U.S. Geological Survey, USGS）为美国能源部（U.S. Department of Energy, DOE）开发，用于支撑内华达试验场（Nevada Test Site, NTS）及内华达州尤卡山的相关调查工作（详细信息参见“大型成果引用”章节A第8页）。