globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00531-017-1457-x
Scopus记录号: 2-s2.0-85014668274
论文题名:
The zircon evidence of temporally changing sediment transport—the NW Gondwana margin during Cambrian to Devonian time (Aoucert and Smara areas, Moroccan Sahara)
作者: Gärtner A.; Youbi N.; Villeneuve M.; Sagawe A.; Hofmann M.; Mahmoudi A.; Boumehdi M.A.; Linnemann U.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2017
卷: 106, 期:8
起始页码: 2747
结束页码: 2769
语种: 英语
英文关键词: Palaeozoic sediment transport ; U–Th–Pb geochronology ; West African Craton ; Zircon from limestone ; Zircon morphology
Scopus关键词: geochronology ; geomorphology ; Gondwana ; limestone ; paleogeography ; Paleozoic ; provenance ; sediment transport ; siliciclastic deposit ; temporal variation ; uranium-lead dating ; zircon ; Adrar Sotuf ; Sahara ; West African Craton ; Western Sahara
英文摘要:

Detrital zircon provenance studies are an established tool to develop palaeogeographic models, mostly based on zircon of siliciclastic rocks and isotope data. But zircon is more than just istopes and features well definable morphological characteristics. The latter may indicate single grain transport histories independent of the individual grade of concordance. This additional tool for palaeogeoraphic reconstructions was tested on zircon from siliciclastic and carbonate sedimentary rocks of Palaeozoic age from the Aoucert and Smara areas of the Souttoufides, while findings of zircon in limestone generally open new archives for sedimentary provenance analysis. The morphologies—length, width, roundness, grain surfaces—of 834 detrital zircons from sediments of allochthonous Cambrian, and (par-)autochthonous Ordovician, and Devonian units were studied, while 772 of them were analysed for their U–Th–Pb isotopes by LA-ICP-MS. Mesoproterozoic zircon contents of more than 10% in the Cambrian sediments exclude the West African Craton (WAC) as exclusive source area. Thus, at least one additional external source is suggested. This is likely the western Adrar Souttouf Massif with its significant Mesoproterozoic zircon inheritance, or comparable, yet unknown sources. Decreasing Mesoproterozoic zircon age populations in Ordovician sediments are thought to be linked to the rifting of the terranes in the course of the Rheic Ocean opening and a predominant supply of WAC detritus. The Devonian sediments likely contain reworked material from the Cambrian siliciclastics, which is shown by the zircon age distribution pattern and the zircon morphologies. Therefore, multiple shifts in the direction of sedimentary transport are indicated. © 2017, Springer-Verlag Berlin Heidelberg.

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85014668274&doi=10.1007%2fs00531-017-1457-x&partnerID=40&md5=613de4472667c0b5910bd82b22355551
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69937
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: Museum für Mineralogie und Geologie, Sektion Geochronologie, GeoPlasma Lab, Senckenberg Naturhistorische Sammlungen Dresden, Königsbrücker Landstraße 159, Dresden, Germany; Department of Geology, Faculty of Sciences-Semlalia, Cadi Ayyad University, P.O. Box 2390, Prince Moulay Abdellah Boulevard, Marrakech, Morocco; Instituto Dom Luiz, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal; CEREGE, Centre Saint-Charles, Aix-Marseille Université, case 67, 3 place Victor Hugo, Marseille, France; Department of Geology, Faculty of Sciences, Moulay Ismail University, P. O. Box 11201, Zitoune, Meknes, Morocco

Recommended Citation:
Gärtner A.,Youbi N.,Villeneuve M.,et al. The zircon evidence of temporally changing sediment transport—the NW Gondwana margin during Cambrian to Devonian time (Aoucert and Smara areas, Moroccan Sahara)[J]. International Journal of Earth Sciences,2017-01-01,106(8)
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