JpGU-AGU Joint Meeting 2017

講演情報

[EJ]Eveningポスター発表

セッション記号 S (固体地球科学) » S-MP 岩石学・鉱物学

[S-MP42] [EJ] 変形岩・変成岩とテクトニクス

2017年5月23日(火) 17:15 〜 18:30 ポスター会場 (国際展示場 7ホール)

[SMP42-P06] The numerical simulation of rigid ellipsoids rotation within Newtonian viscous matrix for the comparison with the arrangement of columnar tourmaline grains within quartz matrix in metacherts

*松村 太郎次郎1増田 俊明2 (1.静岡大学創造科学技術大学院、2.静岡大学理学部地球科学科)

キーワード:形態定向配列、数値シミュレーション、剛体楕円体、電気石、非共軸度

We performed the numerical simulation for the rigid ellipsoids rotation within the Newtonian viscous matrix. The simulation provided the variation of the shape preferred orientation of the ellipsoids with respect to variables between the degree of non-coaxiality (Θ = 0°–90°) and Flinn parameter (Κ = 0–∞). We used the width and length data collected from 3621 of tourmaline grains as the shape factor of the ellipsoids, and the initial distribution pattern of the ellipsoids is assumed to be random in their orientation. Calculation results are obtained on the plane parallel to the foliation (XY-plane) and the plane vertical to the foliation in parallel with the mineral lineation (XZ-plane), because this facilitates the comparison with nature. Using the calculation result, we compared these results with the natural shape preferred orientation of tourmaline grains embedded within quartz matrix of metacherts. The comparison suggests that natural shape preferred orientation of the tourmaline grains from three metacherts correspond to a pure shear (Θ = 90°) and plane to constrictional strain (Κ = 1–10) with about 1–2 of finite strain.