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New ⁴⁰Ar/³⁹Ar age progression for the Louisville hot spot trail and implications for inter–hot spot motion

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https://ir.library.oregonstate.edu/concern/articles/3t945w969

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  • In this study we present 42 new ⁴⁰Ar/³⁹Ar incremental heating age determinations updated age progression for the Louisville seamount trail. Louisville is the South Hawaiian‐Emperor seamount trail, both trails representing intraplate volcanism (~80 Ma to present) and being examples of primary hot spot lineaments. Our age‐progressive trend from 71 to 21 Ma. Assuming fixed hot spots, this makes to the Hawaiian‐Emperor age progression and the most recent absolute plate (WK08G) of Wessel and Kroenke (2008). We observe that for the Louisville ages are systematically older relative to both the WK08G model predictions and with offsets ranging up to 6 Myr. Taking into account the uncertainty about the magmatic succession at individual Louisville volcanoes, these age offsets should estimates, as our sampling probably tended to recover the youngest lava flows. to either a contribution of inter–hot spot motion between the Louisville and easterly location of the Louisville hot spot than the one inferred in the WK08G investigated in this paper, whereby the more eastern hot spot location (52.0°S, 137.2°W) reduces the average age offset, but still results in a relatively large 3.7 Myr. When comparing the new ages to the APM models (S04P, S04G) by attempt to compensate for the motion of hot spots in the Pacific (Hawaii) or Reunion and Walvis), the measured and predicted ages are more in agreement, offset of 2.3 Myr with respect to the S04G model. At face value these more consider both plate and hot spot motions, therefore provide a better fit to the is particularly good for seamounts younger than 50 Ma, a period for which there for the Louisville hot spot and little inter–hot spot motion with Hawaii. However, discrepancies in the Louisville age‐distance record prior to 50 Ma indicate there between Louisville and the other Pacific hot spots that was not corrected for in Finally, based on six new ⁴⁰Ar/³⁹Ar age dates, the 169°W bend in the Louisville formed at least 3 Myr before the formation of the Hawaiian‐Emperor bend. The of both bends thus appears to be asynchronous, which would require other than a global plate motion change between 50 and 47 Ma to explain these two observations.
  • Keywords: Pacific plate, ⁴⁰Ar/³⁹ Ar geochronology, seamounts, Submarine alteration, Guyots, Hot spots
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  • 12
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  • 12
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  • Financial support is provided by NSF‐OCE 0351512.Lauren Colwell was supported by REU support from NSF‐IODP and Molly Gowen by the OSU REU program in 2008.
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