Chromite-bearing spessartites from Kasuga-mura, Japan, and their bearing on possible mantle origin andesite

Late Caledonian dyke-swarms of northern Britain: Spatial and temporal intimacy between lamprophyric and granitic magmatism around the Ross of Mull pluton, Inner Hebrides

“…They also imply a role for lamprophyres in the genesis of acid plutons, as already suggested in other parts of the Caledonides and, indeed, the world (e.g. SuzuKi & SHIRAKI 1980;MACDONALD etal. 1986;THOMPSON & FOWLER 1986, LEAT etal.…”

Geochemistry and mineral chemistry of mafic dykes associated with Hiei Granite pluton, southwest Japan

“…The Cr content of the former sample is lower than the chromite -bearing spessartites (65.6 ppm and 106.8 ppm) in Kasuga -mura (Suzuki and Shiraki, 1980); however, the latter sample has Cr content similar to that of the chromite -bearing spessartites in Kasuga -mura. These values are far lower than those (233 -409 ppm) of the basalts from the Inuyama and Yoro areas (Shiraki et al, 2002).…”

“…Chromite -bearing spessartites, which are associated with the Kaizuki -yama Granite pluton in the Kasuga -mura area, Gifu Prefecture (Sugii and Sawada, 1999), are regarded to be of mantle origin (Suzuki and Shiraki, 1980). These spessartites bear high -magnesian andesitic characteristics; along with the Yoro and Inuyama basalts of Cretaceous age, they are probably derived from the LILErich upper mantle (Shiraki et al, 2002).…”

“…1a), both the mafic dykes and mafic enclaves are rare, which can be attributed to compositional constraints, i.e., granite sense strict. Thus, the occurrence of lamprophyres is quite sporadic; hitherto, the spessartites have only been reported in the Hiei and Kaizuki -yama Granites around Lake Biwa (Suzuki and Shiraki, 1980;C.R.G.G.L.B., 2008). According to Sugii and Sawada (1999), the Kaizuki -yama Granite pluton has many geological, petrographical, and geochemical similarities with the Hiei Granite pluton (C.R.G.G.…”

Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristics

“…4a). Analytical data were recalculated on a volatile-free basis and show low SiO 2 contents (51.1-55.3 wt.%), Al 2 O 3 (12-16.6 wt.%), CaO (4.2-8.7 wt.%), and moderate total alkali contents (1.5-4.7 wt.%) are somewhat lower than those of andesites and basalts from orogenic regions (e.g., Suzuki and Shiraki, 1980;Wilson, 1989). They are calc-alkaline lamprophyres according to the classification scheme of Rock (1987) in a K 2 O vs. SiO 2 diagram (Fig.…”