DOI: 10.1007/s00531-016-1440-y
Scopus记录号: 2-s2.0-85013942492
论文题名: First U–Pb geochronology on detrital zircons from Early-Middle Cambrian strata of the Torgau-Doberlug Syncline (eastern Germany) and palaeogeographic implications
作者: Abubaker A. ; Hofmann M. ; Gärtner A. ; Linnemann U. ; Elicki O.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2017
卷: 106, 期: 7 起始页码: 2445
结束页码: 2459
语种: 英语
英文关键词: Cambrian
; Provenance
; Saxo-Thuringia
; Torgau-Doberlug Syncline
; West African Craton
; Zircon geochronology
Scopus关键词: Cambrian
; detrital deposit
; felsic rock
; geochronology
; melt
; paleogeography
; provenance
; siliciclastic deposit
; syncline
; uranium-lead dating
; zircon
; Germany
; West African Craton
; Leonia
英文摘要:
LA-ICP-MS U–Pb data from detrital zircons of the Ediacaran to Cambrian siliciclastic sequence of the Torgau-Doberlug Syncline (TDS, Saxo-Thuringia, Germany) are reported for the first time. The majority of 203 analysed zircon grains is Proterozoic with minor amount of Archean and Palaeozoic grains. The U–Pb ages fall into three groups: 2.8–2.4 Ga (3%), Neoarchean to earliest Palaeoproterozoic; 2.3–1.6 Ga (46%), early to late Palaeoproterozoic; 1.0–0.5 Ga (47%), Neoproterozoic to Cambrian. This age distribution is typical for the West African Craton as the source area and for Cadomian orogenic events in northwestern Gondwana. The samples show an age gap between 1.6 and 1.0 Ga, which is characteristic for West African provenance and diagnostic in distinguishing this unit from East Avalonia and Baltica. The dataset shows clusters of Palaeoproterozoic ages at 2.2–1.7 Ga, that is typical for western Gondwana, which was affected by abundant magmatic intrusions (ca. 2.2–1.8 Ga) during the Eburnean orogeny (West African craton). Neoarchean zircon ages (3%) point to recycling of magmatic rocks formed during the Liberian and Leonian orogenies. Ediacaran to earliest Cambrian rocks of the TDS originated in an active margin regime of the Gondwanan shelf. The following early Palaeozoic overstep sequence was deposited within rift settings that reflects instability of the West-Gondwanan shelf and the separation of terranes from Ordovician onward. The results of this study demonstrate distinct northwestern African provenance of the Cambrian siliciclastics of the TDS. Due to Th–U ratios from concordant zircon analysis, igneous origin from felsic melts is concluded as the source of these grains. © 2017, Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85013942492&doi=10.1007%2fs00531-016-1440-y&partnerID=40&md5=b02e6432e18d98e37e793a0f779df346
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69972
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Palaeontology, TU Bergakademie Freiberg, Bernhard-von-Cotta street 2, Freiberg, Germany; Senckenberg Naturhistorische Sammlungen Dresden, Museum für Mineralogie und Geologie, Sektion Geochronologie, GeoPlasma Lab, Königsbrücker Landstraße 159, Dresden, Germany
Recommended Citation:
Abubaker A.,Hofmann M.,Gärtner A.,et al. First U–Pb geochronology on detrital zircons from Early-Middle Cambrian strata of the Torgau-Doberlug Syncline (eastern Germany) and palaeogeographic implications[J]. International Journal of Earth Sciences,2017-01-01,106(7)