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Counter-rotating microplates at the Galapagos triple junction.

Emily M Klein1, Deborah K Smith, Clare M Williams

  • 1Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina 27708-0227, USA. ek4@duke.edu

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|February 25, 2005
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Summary
This summary is machine-generated.

A new rift east of the East Pacific Rise reveals two counter-rotating microplates at the Galapagos triple junction. This discovery redefines our understanding of tectonic plate movement in the region.

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Area of Science:

  • Geophysics
  • Plate Tectonics
  • Marine Geology

Background:

  • The Galapagos microplate is a key feature in the eastern equatorial Pacific.
  • An 'incipient' spreading center was previously identified as its northern boundary.
  • This spreading center was thought to be a slowly diverging, westward propagating rift.

Purpose of the Study:

  • To investigate the full extent and motion of the 'incipient' spreading center.
  • To understand the complex tectonic interactions at the Galapagos triple junction.
  • To identify and characterize additional microplates in the region.

Main Methods:

  • Analysis of bathymetric data to identify seafloor spreading features.
  • Kinematic modeling to determine microplate motion relative to major tectonic plates.
  • Geophysical interpretation of rift propagation and rotation.

Main Results:

  • Evidence presented for eastward rifting of the 'incipient' spreading center.
  • Identification of a second, counter-clockwise rotating microplate north of the Galapagos microplate.
  • The Galapagos triple junction is characterized by two counter-rotating microplates separated by the Hess Deep rift.

Conclusions:

  • The 'incipient rift' opens anticlockwise, bounding a second microplate.
  • The Galapagos triple junction involves two counter-rotating microplates.
  • Microplate motion can be modeled as rigid blocks driven by edge drag.