@article{oai:nipr.repo.nii.ac.jp:00010116,
 author = {Adachi, Tatsuro and Hokada, Tomokazu and Osanai, Yasuhito and Toyoshima, Tsuyoshi and Baba, Sotaro and Nakano, Nobuhiko and 足立, 達朗 and 外田, 智千 and 小山内, 康人 and 豊島, 剛志 and 馬場, 壮太郎 and 中野, 伸彦 and アダチ, タツロウ and ホカダ, トモカズ and オサナイ, ヤスヒト and トヨシマ, ツヨシ and ババ, ソウタロウ and ナカノ, ノブヒコ and Adachi, Tatsuro and Hokada, Tomokazu and Osanai, Yasuhito and Toyoshima, suyoshi and Baba, Sotaro and Nakano, Nobuhiko},
 issue = {4},
 journal = {Polar Science, Polar science},
 month = {Jan},
 note = {In the central Sør Rondane Mountains, East Antarctica, orthopyroxene felsic gneiss (OPG) was converted to hornblende-biotite felsic gneiss (HBG) by hydration that accompanied the intrusion of pegmatite. The retrograde HBG contains exsolved rutile in quartz. The composition of orthopyroxene and clinopyroxene in OPG suggests a temperature of 840 °C (interpreted as the near-peak temperature), and the composition of hornblende and plagioclase in HBG suggests a temperature of 670–700 °C (interpreted as the temperature during hydration). Ti concentrations in quartz were measured using an electron probe micro-analyzer, and Ti-in-quartz thermometers were applied. Measured Ti concentrations were 110 ppm (equivalent to 760–820 °C) for homogeneous quartz from OPG and 35 ppm (650–700 °C) for an exsolution-free area of a quartz grain from HBG. The pre-exsolution Ti concentration in quartz from HBG was reconstructed with 100 μm beam diameter and 25 kV of accelerating voltage, giving 103 ppm, similar to the value obtained for homogeneous quartz in OPG. The temperatures obtained using a Ti-in-quartz thermometer are consistent with those estimated using other thermometers. Although analysis of the main constitute minerals in HBG yields the conditions of hydration, the reconstructed pre-exsolution Ti content in quartz within HBG yields the pre-hydration conditions. Thus, the Ti-in-quartz thermometer is a potentially powerful tool with which to identify the peak or near-peak temperature conditions, even for retrogressed metamorphic rocks., 東南極・セールロンダーネ山地に産出する珪長質角閃石黒雲母片麻岩(HBG)に含まれる石英中にルチル離溶組織を見出した。HBGは、周囲に分布する珪長質斜方輝石片麻岩(OPG)がペグマタイトの貫入に伴って加水後退反応を起こした結果であると考えられる。OPGに含まれる主要鉱物からは約800℃のピーク変成条件が得られる。一方でHBGに含まれる主要鉱物からは約650-700℃の加水作用の条件しか得られない。そこでHBGに含まれる石英について、ルチル離溶以前のTi含有量を復元し、Ti-in-quartz地質温度計を適用すると、OPGと同様に約800℃のピーク変成条件が得られる。このことは加水作用などの二次的なイベントによって情報が改変された岩石からでも、Ti-in-quartz地質温度計を適用することで初生的な変成条件を復元できる可能性を示している。},
 pages = {222--234},
 title = {Titanium behavior in quartz during retrograde hydration: Occurrence of rutile exsolution and implications for metamorphic processes in the Sør Rondane Mountains, East Antarctica},
 volume = {3},
 year = {2010}
}