Deciphering Equatorial Pacific deep sea sediment transport regimes by core-log-seismic integration

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http://abstractsearch.agu.org/meetings/2017/FM/EP13B-1616.html
Author(s): Ortiz, Estefania; Tominaga, Masako; Marcantonio, Franco
Author Affiliation(s): Primary:
Texas A&M University College Station, Department of Geology and Geophysics, College Station, TX, United States
Volume Title: AGU 2017 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2017; American Geophysical Union 2017 fall meeting, New Orleans, LA, Dec. 11-15, 2017. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Investigating deep-sea sediment transportation and deposition regimes is a key to accurately understand implications from geological information recorded by pelagic sediments, e.g. climate signals. However, except for physical oceanographic particle trap experiments, geochemical analyses of in situ sediments, and theoretical modeling of the relation between the bottom currents and sediment particle flux, it has remained a challenging task to document the movement of deep sea sediments, that takes place over time. We utilized high-resolution, multichannel reflection seismic data from the eastern equatorial Pacific region with drilling and logging results from two Integrated Ocean Drilling Program (IODP) sites, the Pacific Equatorial Age Transect (PEAT) 7 (Site U1337) and 8 (Site U1338), to characterize sediment transportation regimes on 18-24 Ma oceanic crust. Site U1337, constructed by a series of distinct abyssal hills and abyssal basins; Site U1338, located 570 km SE from Site U1337 site and constructed by a series of ridges, seamounts, and abyssal hills. These sites are of particular interest due to their proximity to the equatorial productivity zone, areas with high sedimentation rates and preservation of carbonate-bearing sediment that provide invaluable insights on equatorial Pacific ecosystems and carbon cycle. We integrate downhole geophysical logging data as well as geochemistry and physical properties measurements on recovered cores from IODP Sites U1337 and U1338 to comprehensively examine the mobility of deep-sea sediments and sediment diagenesis over times in a quasi-3D manner. We also examine 1100 km of high resolution underway seismic surveys from site survey lines in between PEAT 7 and 8 in order to investigate changes in sediment transportation between both sites. Integrating detailed seismic interpretations, high resolution core data, and 230Th flux measurements we aim to create a detailed chronological sedimentation and sediment diagenesis history of this area.
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Chemical composition; East Pacific; Equatorial Pacific; Expedition 321; Expeditions 320/321; Geochemistry; Geophysical methods; Geophysical surveys; IODP Site U1337; IODP Site U1338; Integrated Ocean Drilling Program; Marine sediments; North Pacific; Northeast Pacific; Pacific Equatorial Age Transect; Pacific Ocean; Sediments; Seismic logging; Seismic methods; Surveys; Theoretical models; Well-logging
Coordinates: N035000 N035000 W1231222 W1231222
N023028 N023028 W1175811 W1175811
Record ID: 2019045402
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