LEWISIAN CRUSTAL HISTORY FROM IN SITU SIMS MINERAL CHRONOMETRY AND RELATED METAMORPHIC TEXTURES
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dc.contributor.author | Zhu X.K. | |
dc.contributor.author | O'Nions R.K. | |
dc.contributor.author | Belshaw N.S. | |
dc.contributor.author | Gibb A.J. | |
dc.date.accessioned | 2020-12-14T06:56:38Z | |
dc.date.available | 2020-12-14T06:56:38Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=263163 | |
dc.identifier.citation | Chemical Geology, 1997, , 3, 205-218 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20674 | |
dc.description.abstract | A combination of detailed petrography and in situ SIMS 207Pb/206Pb micro-chronometry of monazite has been carried out on samples from the Lewisian high-grade metamorphic terrain, northwest Scotland. Two episodes of granulite-facies metamorphism have been recognised, the thermal maxima of which are estimated at or before 2760 +/- 12 Ma (2σ) and at 2526 +/- 8 Ma, respectively. Pegmatites at Scourie crystallised at ~ 2480 Ma. The amphibolite-facies metamorphism of the main Laxfordian event is estimated at 1752 +/- 12 Ma and the formation of kyanite and staurolite is associated with this event.The oldest ages of ~ 2760 Ma have been obtained from micro-inclusions of monazite in garnet. It appears that garnet, which has a high closure temperature for the U-Pb system, plays an important role in the behaviour of the monazite U-Pb system. It serves to shield monazite from reaction with the other phases and toarmour monazite from diffusive Pb loss or from resetting. | |
dc.subject | LEWISIAN | |
dc.subject | IN SITU CHRONOLOGY | |
dc.subject | SIMS | |
dc.subject | PB-PB | |
dc.subject | GRANULITE | |
dc.subject | MONAZITE | |
dc.subject | RUTILE | |
dc.subject | XENOTIME | |
dc.title | LEWISIAN CRUSTAL HISTORY FROM IN SITU SIMS MINERAL CHRONOMETRY AND RELATED METAMORPHIC TEXTURES | |
dc.type | Статья |
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