Uchida et al. (2007) investigated the relationship between the chemical composition of biotite and mineralization type associated with representative granitic rocks in Japan. It was found that the average total Al content of biotite, listed by mineralization type, was Pb-Zn = Mo < Cu-Fe < Sn < W < no mineralization. In addition, the study found that the total Al content in biotite increased with the granite’s solidification pressure. However, Uchida et al. (2007) only measured the major elements in the granitic rocks; trace elements were not analyzed. In this paper, we determined the whole rock chemical compositions, including trace elements and rare earth elements, for samples of granitic rocks from the same intrusions studied by Uchida et al. (2007). With these analyses, we aim to confirm and clarify the relationships between the chemical composition of the granitic rocks and 1) the type of metal mineralization and 2) the tectonic settings in which the granitic rocks were emplaced (e.g., [1] [2] ).

The granitic rocks analyzed for this study are from the same 15 areas studied by Uchida et al. [3] (Figure 1). Table 1 lists the names of the areas and mining districts from which the samples were collected, rock type, age, associated metal type, and sample number for the samples.

Intrusions in the Taishu [4] , Obira (granite porphyry) [5] and Chichibu mining districts were designated as granitic rocks related to Pb-Zn mineralization. We studied samples from the Ohkawame [6] and Daito-Yamasa [7] mining districts as granitic rocks related to Mo mineralization. As for Cu-Fe mineralization, granitic rocks in the Kamaishi [8] [9] and Yaguki mining districts and granitic rocks in the Tanzawa area [10] were selected for study. The granitic rocks from the Yaguki mining district were the Eastern granodiorite (the Ohisa granodiorite [11] ) and the Central granodiorite. For intrusions related to Sn mineralization, samples from biotite granite in the Obira mining district [5] and granitic rocks in the Osuzu [12] and Suzuyama mining districts were selected. As for granitic rocks related to W mineralization, we studied granitic rocks in the Yakushima and the Fujigatani-Kiwida (the Habu granodiorite and the Osogoe complex), Ohtani (the Gyojayama granite [7] ) and Yaguki mining districts as well as the Inada coarse-grained granite [13] in the Tsukuba area. In the Yaguki mining district, samples were collected from intrusions of the Western granodiorite (the Yokokawa granodiorite [11] ). Barren granitic rocks were collected from the Hidaka metamorphic belt (the Toyonidake cordierite tonalite and hornblende tonalite [14] ), the Tsukuba area other than the Inada coarse-grained granite [13] and the Fujigatani-Kiwada mining district (the Nakayamagawa complex and the Shimokuhara granite).

The granitic rocks associated with Pb-Zn, Mo, or Cu-Fe mineralization are almost magnetite-series but some are ilmenite-series whereas the granitic rocks with Sn or W mineralization and those without mineralization are all ilmenite- series (Table 1) [1] .

Whole-rock chemical analyses were carried out on 66 samples from the granitic rocks mentioned above (Table 1). Broken down by metal type, there were 10 samples related to Pb-Zn mineralization, 12 samples related to Mo mineralization, 11 samples for Cu-Fe mineralization, 9 samples for Sn mineralization, 13 samples for W mineralization, and 11 samples for barren granitic rocks. Samples

were pulverized using a tungsten carbide rod mill. About 5 g of the pulverized samples were sent to Activation Laboratories Ltd. (Ancaster, Canada) for analysis by their code “4 Litho” lithogeochemistry package. For those analyses, the granitic rock powders were fused using lithium metaborate/tetraborate and digested in dilute nitric acid. Analyses for a total of 55 elements were then obtained by analyzing the aqueous solutions thus prepared using inductively coupled plasma optical emission spectrometer (ICP-OES) and inductively coupled plasma mass spectrometer (ICP-MS). The analytical results are shown in Table 2. Because the samples were contaminated with Co and W by the tungsten carbide rod mill during grinding, Co and W values are not listed in Table 2.