R5: 地球外物質

[R5-16] チクシュルーブ隕石孔の基盤岩石英の微細組織

谷 理帆^2,1、*富岡 尚敬¹、鹿山 雅裕³、常 昱³、西戸 裕嗣⁴、Das Kaushik²、Rae Auriol^5,6、Ferrière Ludovic⁷、Gulick Sean⁸、Morgan Joanna⁵、IODP-ICDP Expedition 364 Scientists (1. 海洋研究開発機構、2. 広島大学、3. 東京大学、4. 岡山理科大学、5. Imperial College London、6. Albert-Ludwigs-Universität Freiburg、7. Natural History Museum Vienna、8. University of Texas at Austin)

キーワード：チクシュルーブ・クレーター、掘削コア試料、カソードルミネッセンス、石英、透過電子顕微鏡

Our study aims at evaluating a newly developed shock barometry method and to characterize shock effects in quartz from the basement granitic rocks recovered by the IODP-ICDP Expedition 364. Shock pressures estimated using the CL spectroscopy method are almost constant throughout the drilling depth in the range of 15–25 GPa. Orientations of planar deformation features and a superstructure in the shocked quartz obsearved by TEM also indicate pressure generation of ~20 GPa.