The Geochronology of Hotspot Trails in the Pacific and the Timing of the Hawaii-Emperor Bend
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The Geochronology of Hotspot Trails in the Pacific and the Timing of the Hawaii-Emperor Bend Anthony Koppers Scripps Institution of Oceanography, IGPP, San Diego, USA. Predictions of the “Fixed Hotspot” Hypothesis Related to Geochronology. Constant Angular Plate Velocities

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Predictions of the “Fixed Hotspot” Hypothesis Related to Geochronology

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Predictions of the fixed hotspot hypothesis related to geochronology

The Geochronology of Hotspot Trails in the Pacific and the Timing of the Hawaii-Emperor BendAnthony KoppersScripps Institution of Oceanography, IGPP, San Diego, USA


Predictions of the fixed hotspot hypothesis related to geochronology

Predictions of the “Fixed Hotspot” Hypothesis Related to Geochronology

  • Constant Angular Plate Velocities

    • Linear Age Progressions

    • Consistency in Observed Local Plate Velocities between Multiple Seamount Trails on the Same Tectonic Plate

  • Changes in Plate Motion Should Cause Similar and Synchronous Bends in Multiple Seamount Trails

    • Same Curvature of Seamount Trails

    • Same Timing


Do we have different kinds of hotspots are different processes involved

Do we have Different Kinds of Hotspots ? Are Different Processes Involved ?

  • PRIMARY / STRONGHotspot Trails that are Continuously Active with a Monotonous Age Progression, Flood Basalt Initiation, Deep Mantle 3He/4He Signature, Large Buoyancy Flux, Low Shear Wave Velocity in Mantle

  • SECONDARY / WEAKAny Other Hotspot Trail that is Typically Short Lived

  • TERTIARYExtensional Features, Like the Puka Puka Ridge

Courtillet et al. 2003


What i will cover in the rest of this talk

What I will Cover in the Rest of this Talk …

  • Louisville Seamount Trail as a Primary Hotspot

  • Secondary Hotspots in the West Pacific

  • The Timing of the Hawaii-Emperor Bends in the Gilbert Ridge


Conclusions i

Conclusions ( I )

  • The elegant “hotspot” model may (still) explain the primary hotspots such as Hawaii and Louisville, if we allow for significant (inter) hotspot motion

  • However, it seems unable to explain the age distributions and origins of secondary hotspots in the West Pacific


Conclusions ii

Conclusions ( II )

  • Hotspot motion, the structure of the overlying lithosphere and changing litho-spheric stress regimes may play an important role in the creation of the seamount trails

  • However, no conclusive data exists at this moment to determine which of these processes is the best candidate …


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