Limited latitudinal motion of the Louisville hotspot

Author(s): Koppers, A. A.; Yamazaki, T.; Geldmacher, J.; Gee, J. S.; Pressling, N.; Hoshi, H.
Author Affiliation(s): Primary:
Oregon State University, CEOAS, Corvallis, OR, United States
National Institute of Advanced Industrial Science and Technology, Geological Survey of Japan, Tsukuba, Japan
GEOMAR, Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Scripps Institution of Oceanography, La Jolla, CA, United States
University of Southampton, National Oceanography Centre, Southampton, United Kingdom
Aichi University of Education, Department of Earth Sciences, Kariya City, Japan
Volume Title: AGU 2012 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2012; American Geophysical Union 2012 fall meeting, San Francisco, CA, Dec. 3-7, 2012. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Integrated Ocean Drilling Program (IODP) Expedition 330 drilled five different guyots in the Louisville Seamount Trail ranging in age between 80 and 50 Ma. Two of the primary goals of this expedition were to attain high-quality estimates of the Louisville hotspot paleolatitudes using paleomagnetic measurements and to improve our knowledge of the overall age progression using high-precision 40Ar/39Ar geochronology. With these data we can provide the unique record of the paleolatitude shift (or lack thereof) of the Louisville mantle plume and compare it with the ≈15° paleolatitude shift observed for seamounts in the Hawaiian-Emperor Seamount Trail over the same time period. We show that the Louisville hotspot remained within ≈3° of its present-day ≈51°S latitude between 70 and 50 Ma, although we cannot discount more significant southward motion since 74 Ma. Our new paleolatitude and age data suggest there has been significant inter-hotspot motion between the Hawaiian and Louisville hotspots in this time interval. We therefore conclude that the Louisville and Hawaiian hotspots moved independently and not as part of a large-scale mantle wind.
Year of Publication: 2012
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Expedition 330; Hot spots; Integrated Ocean Drilling Program; Louisville Ridge; Marine sediments; Mid-ocean ridges; Ocean floors; Pacific Ocean; Paleomagnetism; Plate tectonics; Sediments; South Pacific
Coordinates: S381200 S262900 W1683800 W1744400
Record ID: 2014095519
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