『Abstract
　Some 434 stream sediment samples were collected in Central Japan for a nationwide geochemical mapping project. The resulting geochemical maps are compared with geological, mineral resource and land use maps. Spatial distribution patterns of elemental concentrations in stream sediments are determined mainly by surface geology. Elevated elemental concentrations of alkali elements, Be, Ga, Y, Cs, Ba, lanthanide (Ln), Tl, Th, and U are consistent with outcrop areas of granite, felsic volcanic rock, and accretionary complexes. High concentrations of MgO, Al2O3, P2O5, CaO, 3d transition metals, Zn, and Sr are present in sediments supplied from mafic volcanic rock, high pressure metamorphic rocks, and mafic-ultramafic rocks in accretionary complexes.
　A procedure is established and guidelines are set for a statistical test suite for geochemical mapping. Analysis of variance (ANOVA) and multiple comparison tests are effective for comparing means among the data subsets that are classified by parent lithological materials. Among the many procedures that have been proposed for multiple comparison tests, the Holm procedure was selected for this study. Multiple comparison statistically confirmed the correspondence of elemental abundance in stream sediments with surface geologies. However, visual interpretation of some elements is inconsistent with results of multiple comparison. According to the Holm procedure, the U content in stream sediments is affected not by granite, but by felsic volcanic rock. The Holm procedure clarifies that As, Sb, and Bi, that are not explained by the presence of mineral deposits, are enriched significantly in samples derived from accretionary complexes. Hydrothermal activity on the ocean floor might affect their levels of enrichment. Significant enrichment of Cu, Zn, Cd, Sn, Sb, Hg, and Pb observed i urban areas are also supported by the Holm procedure. The authors inferred that these sediment samples had been contaminated.』

1. Introduction
2. Study area
　2.1. Sampling locations
　2.2. Geology
3. Analytical methods
4. Results
　4.1. Geochemical map preparation
　4.2. Spatial distribution patterns of elemental concentrations in stream sediments
　　4.2.1. The influence of surface geology
　　4.2.2. The influence of mineral occurrences
　　4.2.3. The influence of anthropogenic activity
5. Statistical analysis
　5.1. Surface geology in the river basin
　5.2. A statistical test applied to the geochemical mapping data
　　5.2.1. Normality of the distribution of elemental concentrations in stream sediments
　　5.2.2. The homoscedasticity assumption
　　5.2.3. ample size
　5.3. Application of ANOVA to the geochemical data
　5.4. Application of a multiple comparison procedure to the geochemical data
6. Discussions
　6.1. The homoscedasticity problem
　6.2. Normality of the distribution of elemental concentrations
　6.3. The result of the Holm multiple comparison procedure to test the effect of surface geology
　　6.3.1. Influence of mafic volcanic, metamorphic, and ultramafic rocks
　　6.3.2. Influence of granite, felsic volcanic rocks, and accretionary complexes
　　6.3.3. Influence of sedimentary rock and anthropogenic activity
7. Summary
Acknowledgments
References