Surface Geochemistry Samples (replacing GCHEM over time)

Surface Geochemistry Samples is derived from Minerals and Petroleum's SITES Oracle RDBMS. Data have been obtained from company reports of expired mineral Exploration and Mining Licences since 1965.\n\nA surface sample is typically taken to comprise a sample taken from the weathered profile, and which is the only sample taken at that location. It may be a soil or it may be a sediment taken from an active stream bed. Though most soil samples are taken from the B- or C-horizon (approx. 10-40 cm depth) the dataset may, for example, include a sample taken from 2 m depth and obtained by augering. There is, thus, a continuum between surface geochemistry and boreholes datasets.地表地球化学样品（Surface Geochemistry Samples）源自矿产与石油领域的SITES Oracle关系型数据库管理系统。本数据集的数据采集自1965年以来已过期的矿产勘探与采矿许可的企业报告。 地表样品通常指取自风化剖面的样品，且为对应点位唯一采集的样品。其可为土壤样品，亦可为取自活跃河床的沉积物样品。尽管多数土壤样品采集自土壤发生层的B层或C层（深度约10~40厘米），但本数据集亦可包含经螺旋钻探获取的2米深度样品。因此，地表地球化学数据集与钻孔数据集之间存在连续过渡的关联。