Evidence for and relationship between recent distributed extension and halokinesis in the Farasan Islands, southern Red Sea, Saudi Arabia

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• 作者：Khalid A. Almalki ; Laurent Ailleres ; Peter G. Betts…
• 关键词：Farasan ; Red Sea ; Salt diapirism ; Remote sensing ; Gravity
• 刊名：Arabian Journal of Geosciences
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：8
• 期：10
• 页码：8753-8766
• 全文大小：33,554 KB
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• 作者单位：Khalid A. Almalki (1)
  Laurent Ailleres (2)
  Peter G. Betts (2)
  Rashad A. Bantan (3)
  
  1. King Abdulaziz City for Science and Technology, PO Box 6086, Riyadh, 11442, Kingdom of Saudi Arabia
  2. School of Geosciences, Monash University, PO Box 28E, Wellington Road, Clayton, VIC, 3800, Australia
  3. King Abdulaziz University, PO Box 80177, Jeddah, Kingdom of Saudi Arabia
  
• 刊物类别：Earth and Environmental Science
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-7538

文摘

This paper presents a structural evolution study of the Farasan Bank using an integration of field work, remote sensing data, and regional Bouguer gravity data interpretation. The architecture of the Farasan Islands is influenced by normal faults parallel to the Red Sea rift axis delineating a series of graben and asymmetric half-graben structures as well as salt domes. Geological data suggest that the negative gravity anomaly over the Farasan Bank reflects thick salt deposits. The gravity data shows a general NW-SE trend with the main negative anomaly coincident with the Farasan Islands. Gravity data together with seismic reflection data suggest that salt diapirs are elongated and parallel to the main rift orientation (NW-SE). This indicates that salt deposition and diapirism was controlled by rift-related basement structures. Forward modeling of gravity data constrained by marine seismic reflection interpretation reveals that the evaporites directly overlie the basement in most places. No pre-evaporite formation was detected. Integration of the modeling with field observations and interpretations suggests that the Farasan Islands are in an area of active extension. Extension and salt diapirism on the flank of the mid-ocean ridge is likely to be synchronous with renewed spreading at 5 Ma. Keywords Farasan Red Sea Salt diapirism Remote sensing Gravity