若手研究者セッション
第3日 6月12日（水） 10:30～10:45 B会場（中ホール200）
- 3B-O1-1030（3P-25）
37億年前のカンラン岩に捕獲された流体/メルトの希ガス/ハロゲン分析：マントルの進化過程の追跡を目指して
(1東大・ 2金沢大・ 3UPLB・ 4科博・ 5Univ. Copenhagen・ 6富山大・ 7高知大・ 8海洋機構)
o福島菜奈絵1・ 角野浩史1・ 森下知晃2・ Guotana, Juan3・ 西尾郁也2・ 谷健一郎4・ Waterton, Pedro5・ Szilas, Kristoffer5・ 沢田輝6・ 村山雅史7・ 吉田健太8
To constrain the volatile element evolution of the mantle, noble gas and halogen analyses were performed on 3.7 Ga peridotites. The noble gas composition of fluid/melt inclusions in the peridotites reflects the contribution of noble gases from radiogenic (crust-like) component. Here, we proposed two models to explain the crustal noble gas signatures: (1) slab-derived fluid/melt penetrated and was trapped in the dunite, (2) crustal fluid was trapped in the dunites during metamorphism of the ISB. Assuming that model (1) is correct, it suggests the possibility that the mantle experienced strong contributions from radiogenic components in fluids/melt derived from partial melting of the slab.