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Regional Kinematics & Microplate Capture What do we know?

Regional Kinematics & Microplate Capture What do we know? Inception of PAC-NAM boundary at 12.5 Ma with transtension throughout GEP Baja California not completely coupled to PAC today . 255 km & 1000% Extension. Regional Kinematics & Microplate Capture What do we know?

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Regional Kinematics & Microplate Capture What do we know?

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  1. Regional Kinematics & Microplate Capture What do we know? Inception of PAC-NAM boundary at 12.5 Ma with transtension throughout GEP Baja California not completely coupled to PAC today

  2. 255 km & 1000% Extension Regional Kinematics & Microplate Capture What do we know? Inception of PAC-NAM boundary at 12.5 Ma with transtension throughout GEP Baja California not completely coupled to PAC today 450 – 500 km Extension? ? Uncertainty of Magdelena Fan Offset

  3. Regional Kinematics & Microplate Capture What do we NOT know? How was plate motion partitioned from 6 to 12 Ma? How does this history relate to the dynamics of the rift?

  4. Regional Kinematics & Microplate Capture What do we NOT know? How was plate motion partitioned from 6 to 12 Ma? How does this history relate to the dynamics of the rift? 600 500 400

  5. Regional Kinematics & Microplate Capture What do we NOT know? How was plate motion partitioned from 6 to 12 Ma? How does this history relate to the dynamics of the rift? 600 500 400 What was the proto-Gulf strain rate?

  6. Regional Kinematics & Microplate Capture What do we NOT know? How was plate motion partitioned from 6 to 12 Ma? How does this history relate to the dynamics of the rift? 600 500 400 When was the transition to present boundary conditions?

  7. Critical Problems What are the rift boundary conditions from 6 to 12 Ma? Extend northern geologic transects across coastal plain Timing information from southern gulf basins Extend seismic surveys of east margin subareal basins IODP in the Gulf of California? Was there a delay or acceleration in plate boundary motion in the Gulf, and if so, why? External conditions (remnant slab?) Intrinsic conditions (decreasing rift strength?)

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