ON THE TRANSFORMATION PATHWAYS OF α-PBO2-TYPE TIO2 AT THE TWIN BOUNDARY OF RUTILE BICRYSTALS AND THE ORIGIN OF RUTILE BICRYSTALS
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dc.contributor.author | Shen P. | |
dc.contributor.author | Pan C. | |
dc.contributor.author | Hwang S.-L. | |
dc.contributor.author | Chu H.-T. | |
dc.contributor.author | Yui T.-F. | |
dc.contributor.author | Huang W.-L. | |
dc.date.accessioned | 2023-12-23T04:12:19Z | |
dc.date.available | 2023-12-23T04:12:19Z | |
dc.date.issued | 2005 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=31284480 | |
dc.identifier.citation | European Journal of Mineralogy, 2005, 17, 4, 543-552 | |
dc.identifier.issn | 0935-1221 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/42383 | |
dc.description.abstract | Extraction and electron irradiation (under transmission electron microscopy) of an epitaxial nanometer-thick α-PbO2-type TiO2 slab between twinned rutile bicrystals in ultra-high pressure metamorphic rock caused phase changes into a modified fluorite-type and then an amorphous phase. This martensitic-type transition process accounts for the dislocations and stacking faults of the slab and disordering of Ti in the adjoined rutile bicrystals. Additional hydrothermal experiments of sol-gel TiO2-Al2O3 performed at 8.5-9 kbar and 675-800°C in the piston-cylinder apparatus indicated that twinned rutile bicrystals were shaped in mirror image without the formation of α-PbO2-type TiO2 slab at the twin boundary and with no other planar defects for the bicrystals. The twinned bicrystals can be rationalized by growth and/or coalescence processes. Accordingly, it is not justified to assume a precursor phase of α-PbO2-type structure for twinned rutile bicrystals when there is no such relic. Rutile, unless exsolved epitaxially from a host mineral such as garnet, does not constitute evidence for unusually deep burial for ultra-high pressure terranes. © 2005 E. Schweizerbart'sche Verlagsbuchhandlung. | |
dc.subject | α-PBO2-TYPE TIO2 | |
dc.subject | METAMORPHISM | |
dc.subject | TRANSFORMATION PATH | |
dc.subject | TWINNED RUTILE | |
dc.subject | ULTRAHIGH PRESSURE | |
dc.title | ON THE TRANSFORMATION PATHWAYS OF α-PBO2-TYPE TIO2 AT THE TWIN BOUNDARY OF RUTILE BICRYSTALS AND THE ORIGIN OF RUTILE BICRYSTALS | |
dc.type | Статья | |
dc.identifier.doi | 10.1127/0935-1221/2005/0017-0543 |
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