Detailed Information on Publication Record
2017
Neoproterozoic amorphous "ekanite" (Ca2Th0.9U0.1Si8O20) from Okkampitiya, Sri Lanka: A metamict gemstone with excellent lead-retention performance
NASDALA, Lutz, Fernando CORFU, Doris BLAIMAUER, Chutimun CHANMUANG, Katja RUSCHEL et. al.Basic information
Original name
Neoproterozoic amorphous "ekanite" (Ca2Th0.9U0.1Si8O20) from Okkampitiya, Sri Lanka: A metamict gemstone with excellent lead-retention performance
Authors
NASDALA, Lutz (276 Germany), Fernando CORFU (756 Switzerland), Doris BLAIMAUER (40 Austria), Chutimun CHANMUANG (40 Austria), Katja RUSCHEL (40 Austria), Radek ŠKODA (203 Czech Republic, guarantor, belonging to the institution), Manfred WILDNER (40 Austria), Richard WIRTH (276 Germany), Manuela ZEUG (40 Austria) and E. Gamini ZOYSA (144 Sri Lanka)
Edition
Geology, BOULDER, Geological Society of America, 2017, 0091-7613
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10504 Mineralogy
Country of publisher
United States of America
Confidentiality degree
není předmětem státního či obchodního tajemství
Impact factor
Impact factor: 5.073
RIV identification code
RIV/00216224:14310/17:00100314
Organization unit
Faculty of Science
UT WoS
000411705800019
Keywords in English
PB ZIRCON AGES; RADIATION-DAMAGE; ALTERED ZIRCON; GEOCHRONOLOGY; DISSOLUTION; METAMORPHISM; MICROPROBE; ACCURACY; URANIUM; SYSTEMS
Tags
International impact, Reviewed
Změněno: 9/4/2018 15:44, Ing. Nicole Zrilić
Abstract
V originále
A rare gemstone form of "ekanite" from Okkampitiya, eastern Sri Lanka, has a chemical composition of Ca2Th0.9U0.1Si8O20, corresponding to that of the tetragonal mineral ekanite. The Okkampitiya material, however, has undergone amorphization and is found in a fully metamict state, which is ascribed to the long-term accumulation of high levels of self-irradiation damage (1.38 x 10(20) alpha decay events per gram). The "ekanite" nevertheless does not show any post-growth chemical alteration, and the radiogenic Pb has been retained. The Okkampitiya "ekanite" yielded a Neoproterozoic Pb-207/Pb-206 age of 562.1 +/- 0.8 Ma (uncertainty quoted at the 95% confidence level) that is concordant within the uncertainties of decay constants. The remarkable Pb-retention performance of "ekanite" contradicts the common hypothesis that metamictization in minerals results in U-Pb discordance. The exceptional chemical durability of the heavily radiation-damaged geological material described here has also implications for materials-science research. High radiation resistance, a key criterion in the search for advanced nuclear waste forms, may not be a prerequisite for high aqueous durability of a solid.
Links
| MUNI/A/1653/2016, interní kód MU |
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