@article{0d05f1bc73e7434b977980de17218c5e,
title = "Nanotextures and formation process of coesite in silica glass from the Xiuyan impact crater",
abstract = "Coesite embedded in silica glass in suevite from the Xiuyan crater has been studied by scanning and transmission electron microscopy to better understand the mechanisms at formation of coesite. Coesite grains in this study mainly occur as vein-like aggregates (10–40 μm in width) and irregular aggregates (IAs; <40 μm in size). Both aggregate types are composed of subhedral to anhedral coesite crystals with random orientations. Most of the crystals are 100–1000 nm in size, and some display twinning. The shape, twinning, and random orientation of coesite crystals suggest rapid crystallization in amorphous silica that became supercooled. The center of vein-like aggregates crystallized from localized silica melt within diaplectic silica glass, whereas the rim of vein-like aggregates and IAs crystallized from diaplectic silica glass. The size and amount of coesite crystals in the vein-like aggregate vary greatly from the rim to the center of such veins. Microstructures suggest that the crystals nucleated heterogeneously at the outer rim of the vein and nucleated homogeneously within the vein. IAs do not show any changes in size and amount of coesite crystals from the rim to core of such aggregates. Coesite crystals in IAs primarily nucleate heterogeneously in diaplectic silica glass. It can be concluded that vein-like coesite aggregates are mainly formed by crystallization from silica melt, and irregular coesite aggregates should be formed by solid-state transformation of diaplectic silica glass.",
author = "Feng Yin and Sharp, {Thomas G.} and Ming Chen",
note = "Funding Information: Prof. Tschauner and Dr. Fazio are thanked for their careful and inspired comments that helped improve the quality of the manuscript. We thank Prof. Wolf Uwe Reimold for editorial handling. We thank Yihong Yan at the Electron Microscopy Laboratory of IGGCAS for her efforts to maintain operation in SEM experiments. Rui Li at IGCAS is thanked for helping with making foils by FIB. We thank Haiyang Xian and Yiping Yang at GIGCAS for helping with the TEM analyses. We acknowledge the use of facilities within the Eyring Materials Center at ASU. This work was supported by the National Natural Science Foundation of China (41503062), Guangdong Provincial Key Laboratory of Mineral Physics and Materials (GLMPM-36), and Hunan Provincial Key Laboratory of Shale Gas Resource Utilization (E21819). Funding Information: Prof. Tschauner and Dr. Fazio are thanked for their careful and inspired comments that helped improve the quality of the manuscript. We thank Prof. Wolf Uwe Reimold for editorial handling. We thank Yihong Yan at the Electron Microscopy Laboratory of IGGCAS for her efforts to maintain operation in SEM experiments. Rui Li at IGCAS is thanked for helping with making foils by FIB. We thank Haiyang Xian and Yiping Yang at GIGCAS for helping with the TEM analyses. We acknowledge the use of facilities within the Eyring Materials Center at ASU. This work was supported by the National Natural Science Foundation of China (41503062), Guangdong Provincial Key Laboratory of Mineral Physics and Materials (GLMPM‐36), and Hunan Provincial Key Laboratory of Shale Gas Resource Utilization (E21819). Publisher Copyright: {\textcopyright} 2021 The Meteoritical Society",
year = "2021",
month = jun,
doi = "10.1111/maps.13702",
language = "English (US)",
volume = "56",
pages = "1212--1223",
journal = "Meteoritics and Planetary Science",
issn = "1086-9379",
publisher = "The University of Arkansas Press",
number = "6",
}