NDLI: The origin and properties of mass transport deposits, Ursa Basin, Gulf of Mexico

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The origin and properties of mass transport deposits, Ursa Basin, Gulf of Mexico

Content Provider	Semantic Scholar
Author	Strong, Hilary Elizabeth
Copyright Year	2009
Abstract	Dedication I dedicate this thesis to my fiancé, Dan Petrizzo, my parents, Michael Strong and Candace Person, and my sister, Emma Strong, for their exceptional love and support. advice, edits, data, and valuable discussions; Mark Andrews for laboratory support; John Germaine for assistance with data processing, trouble-shooting, and interpretations; Matthew Colbert for CT scanning and processing; and David DiCarlo for assistance in medical CT scanning. I thank my committee members, Ruarri Day-Stirrat and David Mohrig for feedback to strengthen my thesis. I also thank Ruarri for providing SEM images and assistance in fabric analysis. Lastly I thank my advisor, Peter Flemings, for his support, both academic and financial. From my two years working with Peter I have developed not only stronger scientific skills, but a stronger character as well. I have learned my potential extends far greater than I had previously thought, and with hard work, I am capable of great success. Uniaxial consolidation experiments on Mass Transport Deposit (MTD) and non-MTD core samples from Ursa Basin, Gulf of Mexico, show MTDs have a lower porosity at a given effective stress compared to adjacent non-MTD sediments; a behavior observed in additional experiments on lab remolded Ursa core and resedimented Boston Blue Clay (BBC). I hypothesize debris flow action remolded the sediment: removing its stress history through shearing action, resulting in dense sediments at shallow depth. I supplement testing this hypothesis through lab remolding of BBC (in addition to Ursa clay) due to the greater availability and knowledge of this material. Ursa MTDs record multiple submarine slope failure events within the upper 200 meters below sea floor (mbsf); the most prominent is labeled MTD-2. MTDs have lower porosity and higher bulk density than surrounding, non-MTD, sediment. Porosity (φ) is 52% at 125mbsf – immediately below MTD-2; whereas φ is 46% at 115mbsf – within MTD-2. Comparison of non-MTD samples to MTD-2 samples, and intact to remolded samples, shows a decrease in sediment compressibility (Cc) within the MTD-2 and remolded sediments. Permeability within Ursa mudstones also declines with porosity according to: log (k) = Aφ-B. Permeability is slightly higher within MTD-2; however grain size analysis indicates lower clay content in MTD-2 versus the non-MTDs. Pre-consolidation stress interpretations from the experiments show a linear trend in both MTD and non-MTD sediments, indicating both geologic units depict the same pore pressure profile. Remolding via debris flow explains the origin of MTDs at Ursa and …
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Alternate Webpage(s)	http://www.ig.utexas.edu/research/projects/basin/Theses/Strong_Thesis.pdf
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Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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