AN style="COLOR: black; FONT-SIZE: 14pt" lang=EN-US>an">Shock-Metamorphosed Zircons in the Fragments of the Sudbury Breccias, Ontario, Canada

• 责任者：Chi Han (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Li Chusi
• 刊名：Earth Science Frontiers
• 出版年：2010
• 卷期：17（1)
• 关键词：陨击作用 ; meteorite impacts ; 撞击角砾岩 ; suevite ; 加拿大 ; Canada
• 页码：p.86-92
• 图表：5 illus., 42 refs.
• 分类号：0100
• issnNo：ISSN1005-2321
• isbnNo：CN11-3370/P

AN style="COLOR: black; FONT-SIZE: 14pt" lang=EN-US>an">It is widely accepted that the Sudbury structure formed by large bolide impact.  To find more supporting evidences, the authors used electron-beam scanning microscopy and Raman micro-spectroscopy to document the microstructures and phase transformation in zircons from the fragments of the Sudbury breccias which are among the most prominent features of the Sudbury structure. The data show that planar microstructures in three directions and decomposition of zircon to form a ZrO₂ polymorph plus fayalite (ZrSiO₄ +2FeO=ZrO₂ +Fe₂ SiO₄) are common in the Sudbury zircons the authors examined.  These features support an impact origin for the Sudbury breccias and thereby the Sudbury structure at large.