| DOI: | 10.1016/j.gloplacha.2013.09.001
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| 论文题名: | A gravity model of the deep structure of South Caspian Basin along submeridional profile Alborz-Absheron Sill |
| 作者: | Kadirov F.A.; Gadirov A.H.
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| ISSN: | 0921-8457
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| 出版年: | 2014
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| 卷: | 114 | | 起始页码: | 66
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| 结束页码: | 74
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| 语种: | 英语
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| 英文关键词: | Bouguer gravity
; Earthquake focal mechanisms
; Geodynamic modeling
; GPS velocity
; South Caspian Basin
; Subduction
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| Scopus关键词: | Bouguer gravity
; Earthquake focal mechanisms
; Geodynamic modeling
; GPS velocities
; South Caspian
; Subduction
; Earthquakes
; Faulting
; Global positioning system
; Sedimentology
; Sediments
; Seismic waves
; Site selection
; Structural geology
; Geodynamics
; coast
; compression
; continental crust
; displacement
; earthquake engineering
; geodynamics
; geometry
; GPS
; lithosphere
; Mesozoic
; numerical model
; seismic reflection
; slab
; subduction zone
; temperature effect
; two-dimensional modeling
; upper mantle
; velocity
; Caspian Basin
; Elburz
; Iran
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| 英文摘要: | The South-Caspian Basin (SCB) underlies the southern part of the Caspian Sea, between the ranges of the eastern Greater Caucasus, Talysh, Alborz, and Kopet Dagh. A 2-D regional gravity model along a profile from the Alborz Mountains to the Absheron Ridge has been constructed, constrained by deep (20. s TWT) seismic reflection data. The deep structure model has been evaluated in terms of earthquake focal mechanisms and GPS velocity data to elucidate active tectonic processes and the geodynamic evolution of the SCB.We believe that the rapid increase in the thickness of Mesozoic sediments along the profile from ~. 8. km in the middle part of the profile up to ~. 15. km in the area of the Absheron-Ridge can be explained by inherent basin geometry created by thermal subsidence followed by sediment loading as well as additional effect of tectonic related shortening of sedimentary succession. Near the boundary of oceanic and continental crust in the northern SCB, flexure of oceanic crust is inferred from the observed seismic data and gravity modeling, most probably connected to ongoing subduction of lithosphere of the South Caspian underneath the Scythian Plate of the Mid-Caspian. Subduction beneath the Absheron Ridge is accompanied by the delamination of sediments from the oceanic crust ("basaltic" layer) and creation of accretionary wedge in the overlaying sedimentary succession. The focal mechanisms of the larger earthquakes (M. >. 6) occurring along the northern boundary of the SCB show steep normal-type faulting above the bend of the downgoing slab while, along the southern boundary, thrust faults are inferred. Some thrust-type earthquakes near the northern boundary occur in the lower crust or uppermost mantle and may be associated with compression in the lower part of the brittle lithosphere due to plate flexure. Displacements measured along the coastline of the Caspian Sea by GPS are consistent with the direction of potential oblique subduction of oceanic crust of the SCB beneath the Mid-Caspian. It is speculated that subducting oceanic crust beneath the Absheron-Pribakhan Ridge will eventually be consumed and fold-thrust belt tectonics similar to Eastern Caucasus will commence. © 2013 Elsevier B.V. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893806383&doi=10.1016%2fj.gloplacha.2013.09.001&partnerID=40&md5=8db1e72a8dfd869c4f8e5fee540d51ba
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/11363
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| Appears in Collections: | 全球变化的国际研究计划
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作者单位: | Institute of Geology, Azerbaijan National Academy of Sciences, Azerbaijan
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| Recommended Citation: | |
Kadirov F.A.,Gadirov A.H.. A gravity model of the deep structure of South Caspian Basin along submeridional profile Alborz-Absheron Sill[J],2014-01-01,114.
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