Analytical data for minor and trace elements published or communicated to us, on seventeen GSJ (Geological Survey of Japan) reference samples, “Igneous rock series” received up to April 1994 are compiled. The data were evaluated statistically in consideration of analytical methods. Based on the selected available data, 1994 recommended and proposed values for 65 minor and trace elements are presented.

No abstract

A new geochemical reference material, coral Porites sp. JCp‐1 has been prepared by the Geological Survey of Japan (GSJ). Provisional values for twenty one major, minor and trace elements are presented. The homogeneity tests showed that all elements studied are considered to be homogeneously distributed.

Analytical data compiled on nine Geological Survey of Japan (GSJ) reference samples, "Sedimentary rock series" received by February 1996 are reported. After excluding outliers and examining critically the analytical plmredures employed, the data were evaluated statistically. Recommended or preferable values for f i major and sixty minor and trace elements are Proposed.The Geological Survey of Japan (GSJ) has issued 31 rock reference samples for the analysis of major, minor and trace elements, isotopic compositions and isotopic ages. The reference samples fall into three series: seventeen samples of "Igneous rock series" (1-3). nine samples of "Sedimentary rock series" (4) and five samples of "Instrumental analysis series'' (5-6).The samples of "Sedimentary rock series" are Lake sediment JLk-1, Limestone JLs-1, Dolomite JDo-1. Slate JSl-1 and JS1-2, Stream sediments JSd-1, JSd-2 and JSd-3 and Chert JCh-1 which were issued from 1987 to 1989. Preliminary compilation of analytical data of the three samples, JLk-1, JLs-1 and -1 were reported in 1990 (7). After the compilation, the data for selected elements such as Ag, Au, Pd, Pt (8) and Sc, Y, Zr, Hf and rare earth elements (9) have been published. However, a comprehensive compilation of major, minor and trace elements has not been published.

[1] Abstract: A new geochemical estimate of the young (mainly Paleozoic age to present) upper crust of the Japan Arc shows a dacitic composition in contrast to the idea that andesite is predominant in active orogenic arcs. Temporal changes in composition are not significant from the Paleozoic age to the present for the Japan Arc. The major element composition is similar to previous models of old cratonic upper crusts. The coincidence in the major elements between young and old crusts indicates that essential mechanisms during crust formation have not changed from the Archean era to the present. In trace element compositions the average young upper crust of the Japan Arc has higher Sb and As concentrations and lower concentrations of alkaline, light rare earth, and high field strength elements with respect to previous models of continental upper crusts. The large degree of constancy of trace element composition in marine sedimentary rocks is in contrast to the large variety in igneous rocks. However, the averages for both accretionary and nonaccretionary sedimentary rocks are almost identical to the average for the igneous rocks of the Japan Arc, with the exceptions of high Sb and As concentrations in unmetamorphosed sedimentary rocks. The compositional homogeneity among different types of rocks on an arc scale implies that recycling processes mechanically mix the arcderived igneous materials to homogenize the chemical composition during erosion, transportation, sedimentation, accretion, and uplifting. Since the contribution of oceanic crust to the composition of arc crust is small, the recycling processes have not changed the bulk upper crustal composition of the active continental margin except increase the Sb and As from sediments. Instead, the influx of differentiated acidic rocks from depth is essential to characterize the orogenic crust formation of the young Japan Arc. The characteristically low incompatible element content of the Japanese upper arc crust appears inherited from parental magmas derived from a mantle source depleted during a long-term evolution.