气候变化领域集成服务门户(CCPortal): U–Th-total Pb ages of monazite from the Eckergneiss (Harz Mountains; Germany): evidence for Namurian to Westfalian granulite facies metamorphism at the margin of Laurussia

CCPortal

DOI	10.1007/s00531-019-01735-5
	U–Th-total Pb ages of monazite from the Eckergneiss (Harz Mountains; Germany): evidence for Namurian to Westfalian granulite facies metamorphism at the margin of Laurussia
	Appel P.; Stipp M.; Friedel C.-H.; Fiedrich A.; Kraus K.; Berger S.
发表日期	2019
ISSN	14373254
起始页码	1741
结束页码	1753
卷号	108 期号:5
英文摘要	Four samples of garnet-bearing metapsammitic gneisses and one sample of a kinzigitic sillimanite-garnet-cordierite gneiss from the Eckergneiss Complex (Harz Mountains, Germany) were studied in detail for U–Th-total Pb dating with the electron microprobe. Monazite in all samples occurs in the matrix and show similar chemical compositional variation. A single stage monazite growth during the highest stages of metamorphism was deduced and chemical ages of all samples are between 313 ± 4 and 328 ± 6 Ma. These ages are interpreted as the time of granulite facies metamorphism in the Eckergneiss Complex. This metamorphism post-dates the formation of the main foliation, presumably developed under amphibolite facies conditions, as indicated by overprinting static grain growth and partial melt microstructures. It pre-dates the significantly younger intrusion of the Harzburg Gabbronorite and the Brocken Granite that are of post-Variscan age. Our results, in combination with P–T conditions for the peak of granulite facies metamorphism, show that the Eckergneiss Complex must have resided at a depth of at least 15 km during the Namurian to Westfalian. Later exhumation of the Eckergneiss Complex and its tectonic emplacement within the low-grade metamorphic Rhenohercynian rock units of the NW-Harz most likely occurred along the Acker-Bruchberg Thrust Zone, which marks the transition between the allochthonous and autochthonous domains of the Harz Mountains. At Early Permian time, this imbricated sequence was intruded and sealed by the post-Variscan intrusions. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Eckergneiss; Granulite facies metamorphism; Monazite; U–Th-total Pb dating; Variscan
语种	英语
scopus关键词	gneiss; granulite facies; Hercynian orogeny; igneous intrusion; metamorphic facies; metamorphism; monazite; partial melting; uranium series dating; uranium-lead dating; Germany; Harz Mountains
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/147816
作者单位	Universität Kiel, Institut für Geowissenschaften, Kiel, 24098, Germany; Martin-Luther-Universität Halle-Wittenberg, Institut für Geowissenschaften und Geographie, Von-Seckendorff-Platz 3, Halle, 06120, Germany; Karl-Marx-Str. 56, Leipzig, 04158, Germany; Department Erdwissenschaften, ETH Zürich, Institut für Geochemie und Petrologie, Clausiusstr. 25, Zurich, 8092, Switzerland; Department für Geodynamik und Sedimentologie, Universität Wien, Althanstr. 14, Vienna, 1090, Austria
推荐引用方式 GB/T 7714	Appel P.,Stipp M.,Friedel C.-H.,等. U–Th-total Pb ages of monazite from the Eckergneiss (Harz Mountains; Germany): evidence for Namurian to Westfalian granulite facies metamorphism at the margin of Laurussia[J],2019,108(5).
APA	Appel P.,Stipp M.,Friedel C.-H.,Fiedrich A.,Kraus K.,&Berger S..(2019).U–Th-total Pb ages of monazite from the Eckergneiss (Harz Mountains; Germany): evidence for Namurian to Westfalian granulite facies metamorphism at the margin of Laurussia.International Journal of Earth Sciences,108(5).
MLA	Appel P.,et al."U–Th-total Pb ages of monazite from the Eckergneiss (Harz Mountains; Germany): evidence for Namurian to Westfalian granulite facies metamorphism at the margin of Laurussia".International Journal of Earth Sciences 108.5(2019).