| Abstract: | Multiple sets of crystallographically-oriented planar deformation features (PDFs) are generated by high-strain-rate shock waves at pressures of > 12 GPa in naturally shocked quartz samples. On surfaces, PDFs appear as narrow (50-500 nm) lamellae filled with amorphosed quartz (diaplectic glass) which can be etched with hydrofluoric acid or with hydrothermal alkaline solutions. In contrast, slow-strain-rate tectonic deformation pressure produces wider, semi-linear and widely spaced arrays of dislocation loops that are not glass filled. Etching samples with HF before examination in a scanning electron microscope (SEM) allows for unambiguous visual distinction between glass-filled PDFs and glass-free tectonic deformation arrays in quartz. This etching also reveals the internal ‘pillaring‘ often characteristic of shock-induced PDFs. This technique is useful for easily distinguishing between shock and tectonic deformation in quartz, but does not replace optical techniques for characterizing the shock features. |
| Genre: | Article |
| ProdID: | 70019065 |
| Citation Author: | Gratz, A. J.; Fisler, D. K.; Bohor, B. F. |
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| Citation End Page: | 521 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Earth and Planetary Science Letters |
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| Citation Number Of Pages: | 9 |
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| Citation Search Results Text: | Distinguishing shocked from tectonically deformed quartz by the use of the SEM and chemical etching; 1996; Article; Journal; Earth and Planetary Science Letters; Gratz, A. J.; Fisler, D. K.; Bohor, B. F. |
| Citation Start Page: | 513 |
| Citation Volume: | 142 |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Distinguishing shocked from tectonically deformed quartz by the use of the SEM and chemical etching; 1996; Article; Journal; Earth and Planetary Science Letters; Gratz, A. J.; Fisler, D. K.; Bohor, B. F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1996 00:00 -0600 |
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