جهت دسترسی به کاربرگه ی زیر، از این لینک استفاده کنید. http://dl.pgu.ac.ir/handle/Hannan/78578
Title: Hidden Secrets Of Deformation: Impact-Induced Compaction Within A CV Chondrite
Keywords: Geochemistry & Geophysics;Physical Sciences;04 Earth Sciences
Issue Date: 15-Oct-2016
28-Jul-2016
Publisher: Elsevier
place: Science and Technology Facilities Council (STFC);Science and Technology Facilities Council (STFC);Science and Technology Facilities Council (STFC)
Description: The CV3 Allende is one of the most extensively studied meteorites in worldwide collections. It is currently classified as S1—essentially unshocked—using the classification scheme of Stöffler et al. (1991), however recent modelling suggests the low porosity observed in Allende indicates the body should have undergone compaction-related deformation. In this study, we detail previously undetected evidence of impact through use of Electron Backscatter Diffraction mapping to identify deformation microstructures in chondrules, AOAs and matrix grains. Our results demonstrate that forsterite-rich chondrules commonly preserve crystal-plastic microstructures (particularly at their margins); that low-angle boundaries in deformed matrix grains of olivine have a preferred orientation; and that disparities in deformation occur between chondrules, surrounding and non-adjacent matrix grains. We find heterogeneous compaction effects present throughout the matrix, consistent with a highly porous initial material. Given the spatial distribution of these crystal-plastic deformation microstructures, we suggest that this is evidence that Allende has undergone impact-induced compaction from an initially heterogeneous and porous parent body. We suggest that current shock classifications (Stöffler et al., 1991) relying upon data from chondrule interiors do not constrain the complete shock history of a sample.
Other Identifiers: http://www.sciencedirect.com/science/article/pii/S0012821X1630406X
0012-821X
http://hdl.handle.net/10044/1/38407
https://dx.doi.org/10.1016/j.epsl.2016.07.050
ST/J001260/1
ST/M007642/1
ST/N000803/1
Type Of Material: Other
Appears in Collections:Faculty of Engineering

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