Skip to Main Content
Frequently Asked Questions
Submit an ETD
Global Search Box
Need Help?
Keyword Search
Participating Institutions
Advanced Search
School Logo
Files
File List
Yeakley_Thesis.pdf (58.23 MB)
ETD Abstract Container
Abstract Header
INFLUENCE OF SALT TECTONICS ON SEAFLOOR MORPHOLOGY FROM ALGERIA TO SARDINIA
Author Info
Yeakley, Julia A
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=kent1541708033867738
Abstract Details
Year and Degree
2018, MS, Kent State University, College of Arts and Sciences / Department of Earth Sciences.
Abstract
This study uses previously obtained marine geophysical data for the proposed Galsi pipeline route from Algeria to Sardinia to analyze the buried salt distribution and calculate the amounts of fault displacements associated with halokinesis. Crossing the convergent African/Nubian–European plate boundary, the southern section of the proposed pipeline route traverses’ continental shelves and slopes of Algeria and Sardinia, as well as the Algerian abyssal plain of the Western Mediterranean. Deeply buried Messinian-age salt is present throughout this area. With its low compressibility, salt is less dense and, therefore, more buoyant than the clastic overburden sediment, and thus tends to flow and form diapiric structures. Salt diapirs rise and push on overlying sediments, steepening slopes and causing faults to form. Fault displacements above diapiric structures were compared near the compressive plate boundary with those within passive margin environments. Measured offsets from seismic profiles of different resolutions are associated in this study with predicted sediment age at depth of each offset. The offsets were then used to calculate an average rate of movement along faults of 1.5 cm/ky. The highest rates along faults associated with halokinesis are along the Cagliari slope near Sardinia (2.5 to 2.7 cm/ky) and near the convergent plate boundary (2.3 cm/ky). In addition to faulting, one of the major threats to underwater pipelines can be submarine landslides. Due to decreased frictional resistance to sliding because of pore pressure, submarine landslides can occur at very low slope angles and can spread for much greater distances than terrestrial slope failures. Utilizing the same marine geophysical surveys and geotechnical data, analysis of the frequency and aerial extent of underwater failure events in this area can be linked, partially, to the distribution and nature of Messinian-age evaporites and the influence of salt tectonics (halokinesis). Turbidity currents and hyperpycnal flows are present within the Algerian Basin, whereas local debris flows, landslide runouts, and channelized debris flows are present along the Sardinian slope. Several mass wasting events affecting the slope off the coast of Sardinia can be observed using ultra high resolution 2D seismic data as well as geomorphic features in bathymetric images. Many small slides can be connected to the upward movement of salt diapirs pushing on the overlying sedimentary drape. However, low sedimentation rates, determined during this study, suggest slope failures related to such salt occurred more than 12,000 years ago with an overall average of greater than 20,000 years between events.
Committee
Abdul Shakoor, Dr. (Advisor)
Daniel Holm, Dr. (Committee Member)
Christopher Rowan, Dr. (Committee Member)
William Johnson (Committee Member)
Pages
121 p.
Subject Headings
Geology
Keywords
Halokinesis, Salt Tectonics, Geophysics, Submarine Landslide
Recommended Citations
Refworks
EndNote
RIS
Mendeley
Citations
Yeakley, J. A. (2018).
INFLUENCE OF SALT TECTONICS ON SEAFLOOR MORPHOLOGY FROM ALGERIA TO SARDINIA
[Master's thesis, Kent State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=kent1541708033867738
APA Style (7th edition)
Yeakley, Julia.
INFLUENCE OF SALT TECTONICS ON SEAFLOOR MORPHOLOGY FROM ALGERIA TO SARDINIA .
2018. Kent State University, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=kent1541708033867738.
MLA Style (8th edition)
Yeakley, Julia. "INFLUENCE OF SALT TECTONICS ON SEAFLOOR MORPHOLOGY FROM ALGERIA TO SARDINIA ." Master's thesis, Kent State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1541708033867738
Chicago Manual of Style (17th edition)
Abstract Footer
Document number:
kent1541708033867738
Download Count:
166
Copyright Info
© 2018, all rights reserved.
This open access ETD is published by Kent State University and OhioLINK.