DOI: 10.1007/s00531-014-1041-6
Scopus记录号: 2-s2.0-84929144063
论文题名: Tectonically controlled sedimentation: Impact on sediment supply and basin evolution of the Kashafrud Formation (Middle Jurassic, Kopeh-Dagh Basin, northeast Iran)
作者: Sardar Abadi M. ; Da Silva A.-C. ; Amini A. ; Aliabadi A.A. ; Boulvain F. ; Sardar Abadi M.H.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 8 起始页码: 2233
结束页码: 2254
语种: 英语
英文关键词: Deltas
; Iran
; Kashafrud formation
; Kopeh-dagh basin
; Magnetic susceptibility
; Turbidites
; Upper bajocian–bathonian
英文摘要: The Kashafrud Formation was deposited in the extensional Kopeh-Dagh Basin during the Late Bajocian to Bathonian (Middle Jurassic) and is potentially the most important siliciclastic unit from NE Iran for petroleum geology. This extensional setting allowed the accumulation of about 1,700 m of siliciclastic sediments during a limited period of time (Upper Bajocian–Bathonian). Here, we present a detailed facies analysis combined with magnetic susceptibility (MS) results focusing on the exceptional record of the Pol-e-Gazi section in the southeastern part of the basin. MS is classically interpreted as related to the amount of detrital input. The amount of these detrital inputs and then the MS being classically influenced by sea-level changes, climate changes and tectonic activity. Facies analysis reveals that the studied rocks were deposited in shallow marine, slope to pro-delta settings. A major transgressive–regressive cycle is recorded in this formation, including fluvial-dominated delta to turbiditic pro-delta settings (transgressive phase), followed by siliciclastic to mixed siliciclastic and carbonate shoreface rocks (regressive phase). During the transgressive phase, hyperpycnal currents were feeding the basin. These hyperpycnal currents are interpreted as related to important tectonic variations, in relation to significant uplift of the hinterland during opening of the basin. This tectonic activity was responsible for stronger erosion, providing a higher amount of siliciclastic input into the basin, leading to a high MS signal. During the regressive phase, the tectonic activity strongly decreased. Furthermore, the depositional setting changed to a wave- to tide-dominated, mixed carbonate–siliciclastic setting. Because of the absence of strong tectonic variations, bulk MS was controlled by other factors such as sea-level and climatic changes. Fluctuations in carbonate production, possibly related to sea-level variations, influenced the MS of the siliciclastic/carbonate cycles. Carbonate intervals are characterized by a strong decrease of MS values indicates a gradual reduction of detrital influx. Therefore, the intensity of tectonic movement is thought to be the dominant factor in controlling sediment supply, changes in accommodation space and modes of deposition throughout the Middle Jurassic sedimentary succession in the Pol-e-Gazi section and possibly in the Kopeh-Dagh Basin in general. © 2014, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84929144063&doi=10.1007%2fs00531-014-1041-6&partnerID=40&md5=0fb00060ba679969b80aac7bce5733b7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70466
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: Pétrologie Sédimentaire, B20, Université de Liège, Sart-Tilman, Liège, Belgium; Department of Geology, University College of Sciences, University of Tehran, Tehran, Iran; Department of Education, Mashhad, Khorasan Razavi, Iran; Department of Basic Science, Farhangian University of Sabzevar, Sabzevar, Iran
Recommended Citation:
Sardar Abadi M.,Da Silva A.-C.,Amini A.,et al. Tectonically controlled sedimentation: Impact on sediment supply and basin evolution of the Kashafrud Formation (Middle Jurassic, Kopeh-Dagh Basin, northeast Iran)[J]. International Journal of Earth Sciences,2014-01-01,103(8)