R8: Metamorphic rocks and tectonics

2:45 PM - 3:00 PM JST(5:45 AM - 6:00 AM UTC)

[R8-10] Uranium–Lead ages of grossular, titanite and apatite in a pelitic schist (Menipa, Sør Rondane Mountains, East Antarctica)

*Sota Niki¹, Tetsuo Kawakami², Tatsuro Adachi³, Masaoki Uno⁴, Fumiko Higashino², Takafumi Hirata¹ (1. Univ. Tokyo Sci., 2. Kyoto Univ. Sci., 3. Kyushu Univ., 4. Tohoku Univ.)

Keywords:

Garnet,U–Pb geochronology,LA-ICP-MS,Titanite,Apatite

Recent developments in laser ablation ICP mass spectrometry (LA-ICP-MS) have made it possible to extract chronological data from a wide variety of mineral species. We conducted in-situ U–Pb dating of garnet, titanite and apatite occurring in a pelitic schist collected from Menipa, Sør Rondane Mountains (SRM) using LA-ICP-MS. The U–Pb ages of garnet, titanite, apatite were 612.2±7.7 Ma, 527±11 Ma, 496.0±8.6 Ma, respectively. From the age data, 100 million years of history in SRM can be decoded.