The Geochronology of Hotspot Trails in the Pacific and the Timing of the Hawaii-Emperor Bend
Download
1 / 25

Predictions of the “Fixed Hotspot” Hypothesis Related to Geochronology - PowerPoint PPT Presentation


  • 87 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Predictions of the “Fixed Hotspot” Hypothesis Related to Geochronology' - yetta


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

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 Processes Involved ?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 ) Processes Involved ?

  • 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 ) Processes Involved ?

  • 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 …


ad