Utah Geochronology Uranium Thorium Lead

NOTE: This dataset holds 'static' data that we don't expect to change. We have removed it from the SDE database and placed it in ArcGIS Online, but it is still considered part of the SGID and shared on opendata.gis.utah.gov. The Utah Geochronology Database contains ages and related dating information of sampled geologic materials (soil and rock) using argon (40Ar/39Ar), fission track, optically-stimulated luminescence (OSL), radiocarbon (14C), rhubidium/strontium, or uranium/thorium/lead dating methods and were analyzed for a variety of geologic-related projects by the UGS and others. These ages were used in fault trench investigations to determine the timing of past earthquakes and to develop other paleoseismic parameters, in the dating of basalt flows for eruption histories and in dating fault movement, and similar projects. Since geochronologic methods have significantly evolved and improved through time, older data is often not as reliable or usable as more recently dated materials. The user should use caution in using this data, as significant knowledge and experience is often needed to interpret and apply geochronologic data to projects correctly. As the database is expanded in the future, age results from other geochronologic dating methods are anticipated to be added. Various geochronologic data from geologic mapping projects may be found here. Donations of geochronologic data in Utah are appreciated, so that these data can be permanently archived and discoverable and available to all users. Contact the UGS for more details. The Uranium/Thorium/Lead feature class contains metadata specific to each uranium/thorium/lead sample in the database. Not all fields will contain data, due to the lack of available information, or the field may not apply to the specific sample. Most uranium/thorium/lead samples in the database were imported from the legacy U.S. Geological Survey National Geochronological Database.注意：本数据集存储的是预期不会发生变更的「静态」数据。我们已将其从SDE数据库中移除并上传至ArcGIS Online，但它仍属于SGID的组成部分，并在opendata.gis.utah.gov平台上对外共享。犹他州年代学数据库收录了采用氩-40/氩-39（⁴⁰Ar/³⁹Ar）、裂变径迹、光释光（optically-stimulated luminescence, OSL）、放射性碳（¹⁴C）、铷-锶（Rb/Sr）以及铀-钍-铅等测年方法获取的采样地质物质（土壤与岩石）的年龄及相关测年信息，这些数据由犹他地质调查局（UGS）及其他机构针对各类地质相关项目完成分析。上述年龄数据曾被用于断层探槽调查，以确定过往地震的发生时间并推导其他古地震参数；还被应用于玄武岩流喷发历史定年、断层活动年代测定等同类项目。由于年代学方法随时间推移已取得显著发展与优化，早期数据的可靠性与可用性通常不及近期测定的样品。使用者在调用本数据集时需格外谨慎，因为正确解读并将年代学数据适配至具体项目，往往需要深厚的专业知识与丰富的实践经验。随着本数据库未来的扩容升级，预计还将加入其他年代学测年方法产出的年龄结果。本平台亦可检索到各类地质填图项目产生的年代学数据。我们诚挚欢迎各界捐赠犹他州境内的年代学数据，以便此类数据能够得到永久归档、公开获取并便于所有用户查找。如需了解更多详情，请联系犹他地质调查局（UGS）。铀-钍-铅要素类包含针对数据库中每一例铀-钍-铅样品的专属元数据。由于部分信息缺失或字段不适用于特定样品，并非所有字段都会填充有效数据。数据库中的绝大多数铀-钍-铅样品均源自美国地质调查局原国家年代学数据库的导入数据。