气候变化领域集成服务门户(CCPortal): Lu–Hf geochronology of ultra-high-pressure eclogites from the Tromsø-Nappe; Scandinavian Caledonides: evidence for rapid subduction and exhumation

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DOI	10.1007/s00531-020-01866-0
	Lu–Hf geochronology of ultra-high-pressure eclogites from the Tromsø-Nappe; Scandinavian Caledonides: evidence for rapid subduction and exhumation
	Fassmer K.; Martinet I.; Miladinova I.; Sprung P.; Froitzheim N.; Fonseca R.O.C.; Münker C.; Janák M.; Kullerud K.
发表日期	2020
ISSN	14373254
起始页码	1727
结束页码	1742
卷号	109 期号:5
英文摘要	Geochronology of ultra-high-pressure metamorphic rocks is able to constrain the timing and rates of subduction-zone processes. Lu–Hf garnet dating has the potential to yield information about the timing of the prograde evolution of subducting rocks under increasing pressure. In combination with other methods, it thus allows constraining the complete P–T–t path with high precision. Ultra-high-pressure eclogites from the Tromsø Nappe, the structurally highest tectonic unit of the Scandinavian Caledonides in northern Norway, were dated using Lu–Hf geochronology on garnet. A sample from Tromsdalstind yielded an age of 448.3 ± 3.6 Ma, interpreted as dating prograde garnet growth due to preserved zoning in the major-element and Lu contents of garnet grains. A sample from the diamond-bearing locality Tønsvika yielded an identical age of 449.4 ± 3.3 Ma. Garnet from this sample shows a weak zoning in Ca content and near-homogeneous Lu content. These ages are identical within error among each other and with published U–Pb ages of peak-eclogite-facies zircon and rutile/titanite from exhumation-related leucosome veins. Consequently, the entire subduction–exhumation cycle leading to the ultra-high-pressure eclogites lasted only very few millions of years during the Late Ordovician. © 2020, The Author(s).
英文关键词	Garnet; Lu–Hf geochronology; Scandinavian Caledonides; Tromsø Nappe; UHP metamorphism
语种	英语
scopus关键词	eclogite; exhumation; garnet; geochronology; hafnium; lutetium; P-T-t path; subduction; ultrahigh pressure metamorphism; Caledonides
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147656
作者单位	Institute of Geosciences, University of Bonn, Meckenheimer Allee 169, Bonn, 53115, Germany; Institute of Geology, University of Innsbruck, Innrain 52, Innsbruck, 6020, Austria; Institute of Geology and Mineralogy, University of Cologne, Cologne, 50674, Germany; Institute of Earth Sciences, NAWI Graz Geocenter, University of Graz, Heinrichstrasse 26, Graz, 8010, Austria; Abteilung Hotlabor, Paul Scherrer Institut, Villigen, 5232, Switzerland; Earth Science Institute, Slovak Academy of Sciences, Dúbravská cesta 9, P.O. Box 106, Bratislava, 840 05, Slovakia; Norwegian Mining Museum, P.O. Box 18, Kongsberg, 3602, Norway
推荐引用方式 GB/T 7714	Fassmer K.,Martinet I.,Miladinova I.,等. Lu–Hf geochronology of ultra-high-pressure eclogites from the Tromsø-Nappe; Scandinavian Caledonides: evidence for rapid subduction and exhumation[J],2020,109(5).
APA	Fassmer K..,Martinet I..,Miladinova I..,Sprung P..,Froitzheim N..,...&Kullerud K..(2020).Lu–Hf geochronology of ultra-high-pressure eclogites from the Tromsø-Nappe; Scandinavian Caledonides: evidence for rapid subduction and exhumation.International Journal of Earth Sciences,109(5).
MLA	Fassmer K.,et al."Lu–Hf geochronology of ultra-high-pressure eclogites from the Tromsø-Nappe; Scandinavian Caledonides: evidence for rapid subduction and exhumation".International Journal of Earth Sciences 109.5(2020).