Apatite Composition of Representative Magnetite‐series and Ilmenite‐series Granitoids in Japan

Abstract

Apatites of representative magnetite‐series and ilmenite‐series granitoids were studied in the Japanese Islands. Concentrations of the volatile components F, Cl and SO3 are differently distributed in apatites of these granitoid series. Apatites are always fluoroapatite. They have weakly higher F content in the ilmenite series than in the magnetite series. In contrast, Cl and SO3, are significantly concentrated in apatites of the magnetite series compared to the ilmenite series. These characteristics reflect the original concentrations of these components in the host granitic magmas. A high fO2 seems most important for the S‐concentration as sulfate in apatite of the magnetite series. REE and Y are only erratically high in the studied apatites.

Seawater signatures in the supracrustal Lewisian Complex, Scotland

“…Apatite in the Tiree marble commonly contains above 1 wt % chlorine, and up to 2.8 wt % (Table S3, in the Supplementary Material available online at https://doi.org/10.1017/S0016756822000474). These contents are higher than those in many other marbles (Table S3), or apatite in granites and iron deposits which mostly contain <0.5 % (Ishihara & Moriyama, 2015). The Tiree apatite is thus considered to be chlorine-rich.…”

Apatite Chemical Compositions from Acadian-Related Granitoids of New Brunswick, Canada: Implications for Petrogenesis and Metallogenesis

“…Furthermore, apatite can preserve information about magmatic and post-magmatic processes due to its early formation and long stability during the differentiation of magmatic systems (Lisowiec et al [6]). Many elements can substitute within apatite crystal structure, making this mineral a proxy for thermochronological studies, radiometric, and fission track dating (Nemchin and Pidgeon [7], Chamberlain and Bowring [8], Gleadow et al [9], Harrison et al [10], Carrapa et al [11], Chew et al [12], Tang et al [13], Vamvaka et al, [14]), determination of oxygen fugacity (Cao et al [15], Miles et al [16], Marks et al [3]), determination of halogen fugacity (Zhu and Sverjensky [17], Teiber et al [18]), thermometry (Stormer and Carmichael [19], Ludington [20], Wones [21], Munoz [22], Zhu and Sverjensk [17], Sallet [23]), and the study of magma evolution history (Ishihara [24], Nash [25], Teiber et al [26], Ishihara and Moriyama [27]). Furthermore, apatite geochemical characteristics can be used to study granitoid petrogenesis (Sha and Chappell [28], Chu et al [29], Cao et al [15], Ding et al [30]) and secondary metasomatic processes (Zirner et al [31], Broom-Fendley et al [32]).…”

A Tribute to Shunso Ishihara

“…His work also characterized the mineral chemistry of numerous granitoids (e.g. Czamanske et al, 1981;Wu & Ishihara, 1994;Ishihara, 2008;Ishihara & Moriyama, 2016) and correlated their oxidation states with other petrochemical parameters, notably O-and S-isotope compositions (Sasaki & Ishihara, 1979;Shibata & Ishihara, 1979a;Ishihara & Sasaki, 1989;Ishihara et al, 1995;Ishihara & Matsuhisa, 1999).…”