DOI: 10.1007/s00531-013-0965-6
Scopus记录号: 2-s2.0-84893730115
论文题名: Petrography and geochemistry of Cretaceous to quaternary siliciclastic rocks in the Tarfaya basin, SW Morocco: Implications for tectonic setting, weathering, and provenance
作者: Ali S. ; Stattegger K. ; Garbe-Schönberg D. ; Kuhnt W. ; Kluth O. ; Jabour H.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 1 起始页码: 265
结束页码: 280
语种: 英语
英文关键词: Geochemistry
; Petrography
; Provenance
; Tarfaya basin
; Tectonic setting
; Weathering
Scopus关键词: chemical weathering
; Cretaceous
; heavy mineral
; marl
; petrography
; provenance
; sandstone
; sediment chemistry
; siliciclastic deposit
; tectonic setting
; Anti Atlas
; Atlas Mountains
; Guelmim-Es Smara
; Morocco
; Reguibat Shield
; Tarfaya Basin
; West African Craton
英文摘要: The petrography, heavy mineral analysis, major element geochemical compositions and mineral chemistry of Early Cretaceous to Miocene-Pliocene rocks, and recent sediments of the Tarfaya basin, SW Morocco, have been studied to reveal their depositional tectonic setting, weathering history, and provenance. Bulk sediment compositional and mineral chemical data suggest that these rocks were derived from heterogeneous sources in the Reguibat Shield (West African Craton) including the Mauritanides and the western Anti-Atlas, which likely form the basement in this area. The Early Cretaceous sandstones are subarkosic in composition, while the Miocene-Pliocene sandstones and the recent sediments from Wadis are generally carbonate-rich feldspathic or lithic arenites, which is also reflected in their major element geochemical compositions. The studied samples are characterized by moderate SiO2 contents and variable abundances of Al2O3, K2O, Na2O, and ferromagnesian elements. Binary tectonic discrimination diagrams demonstrate that most samples can be characterized as passive continental marginal deposits. Al2O3/Na2O ratios indicate more intense chemical weathering during the Early Cretaceous and a variable intensity of weathering during the Late Cretaceous, Early Eocene, Oligocene-Early Miocene, Miocene-Pliocene and recent times. Moreover, weathered marls of the Late Cretaceous and Miocene-Pliocene horizons also exhibit relatively low but variable intensity of chemical weathering. Our results indicate that siliciclastics of the Early Cretaceous were primarily derived from the Reguibat Shield and the Mauritanides, in the SW of the basin, whereas those of the Miocene-Pliocene had varying sources that probably included western Anti-Atlas (NE part of the basin) in addition to the Reguibat Shield and the Mauritanides. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893730115&doi=10.1007%2fs00531-013-0965-6&partnerID=40&md5=b9970a59043b1d137ab9ec968309574e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70461
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: Institute of Geosciences, Christian-Albrechts-University, 24118 Kiel, Germany; RWE Dea AG, Hamburg, Germany; ONHYM, Rabat, Morocco
Recommended Citation:
Ali S.,Stattegger K.,Garbe-Schönberg D.,et al. Petrography and geochemistry of Cretaceous to quaternary siliciclastic rocks in the Tarfaya basin, SW Morocco: Implications for tectonic setting, weathering, and provenance[J]. International Journal of Earth Sciences,2014-01-01,103(1)