Geochemistry, Geophysics, Geosystems – Semi-automatic fracture zone tracking

Wessel, P., Matthews, K. J., Müller, R. D., Mazzoni, A., Whittaker, J. M., Myhill, R., & Chandler, M. T. (2015). Semi-automatic fracture zone tracking. Geochemistry, Geophysics, Geosystems. doi: 10.1002/2015GC005853. Semi-automatic fracture zone tracking

Nature Geoscience – Long-term interaction between mid-ocean ridges and mantle plumes

Whittaker, J. M., Afonso, J. C., Masterton, S., Müller, R. D., Wessel, P., Williams, S. E., & Seton, M. (2015). Long-term interaction between mid-ocean ridges and mantle plumes. Nature Geoscience, 8(6), 479-483. doi: http://dx.doi.org/10.1038/ngeo2437. Long-term interaction between mid-ocean ridges and mantle plumes Download supplementary materials – zip file

Long-term interaction between mid-ocean ridges and mantle plumes

Whittaker et al 2015 MORs plumes LIPSCitation
Whittaker, J. M., Afonso, J. C., Masterton, S., Müller, R. D., Wessel, P., Williams, S. E., & Seton, M. (2015). Long-term interaction between mid-ocean ridges and mantle plumes. Nature Geoscience, 8(6), 479-483.

Summary
Plate tectonic motions are commonly considered to be driven by slab pull at subduction zones and ridge push at mid-ocean ridges, with motion punctuated by plumes of hot material rising from the lower mantle. Within this model, the geometry and location of mid-ocean ridges are considered to be independent of lower-mantle dynamics, such as deeply sourced plumes that produce voluminous lava eruptions-termed large igneous provinces. Here we use a global plate model to reconstruct the locations of large igneous provinces relative to plumes and mid-ocean ridges at the time they formed. … Read more…

Geophysical Journal International – Absolute motion of Africa around Hawaii-Emperor bend time

Maher, S. M., Wessel, P., Müller, R. D., Williams, S. E., & Harada, Y. (2015). Absolute plate motion of Africa around Hawaii-Emperor bend time. Geophysical Journal International, 201(3), 1743-1764. doi: 10.1093/gji/ggv104. Absolute plate motion of Africa around Hawaii-Emperor bend time Download supplementary materials – zip file

Geochemistry, Geophysics, Geosystems – Community infrastructure and repository for marine magnetic identifications

magnetic_picks_globeMagnetic anomaly identifications form the primary data set from which the age of the oceanic lithosphere can be determined, a critical component of reconstructing the seafloor spreading history of ocean basins. This data is now available as part of an open source, community-driven online repository that contains quality-checked magnetic anomaly picks, organised by ocean basin and publication source.

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Earth and Planetary Science Letters – Reconstructing Ontong Java Nui: Implications for Pacific absolute plate motion, hotspot drift and true polar wander

Chandler, M. T., Wessel, P., Taylor, B., Seton, M., Kim, S. S., & Hyeong, K. (2012). Reconstructing Ontong Java Nui: Implications for Pacific absolute plate motion, hotspot drift and true polar wander. Earth and Planetary Science Letters, 331, 140-151. doi:10.1016/j.epsl.2012.03.017. Download the paper – pdf

The global fracture zone and magnetic lineation data base project

Project Summary
Plate kinematic models derive from the detailed identifications of conjugate magnetic isochron picks and fracture zones (FZ). These data form the foundation of all relative marine plate tectonic reconstructions and codify our understanding of Earth’s surface evolution since the Mesozoic. Furthermore, FZ traces have extensive uses in many other marine geophysical investigations such as studying the origins of transform fault offsets, identifying seamounts and isolating abyssal hill roughness within fracture zone provinces, examining predictions from competing thermal models of the lithosphere, and much more. Kinematic models also require temporal information and this dimension is provided by identification of key magnetic isochron boundaries from total field magnetic anomalies collected along ship tracks. … Read more…

IODP workshop on Indian Ocean Drilling scheduled for late 2011

An Integrated Ocean Drilling (IODP) workshop on Indian Ocean Drilling to be held in late 2011 in Goa, India has just been approved, funded by $33,000 from IODP, and supported by the Australian IODP Office, which plans to send 15 Australians and Kiwis to the meeting, including EarthByte’s Dietmar Müller, and Stephen Gallagher (UMelb), Neville Exon (ANU), Richard Arculus (ANU), Mike Coffin (Tasmania) and Richard Wysoczanski (NZ, NIWA). The workshop is timed to suit an April 2012 drilling proposal submission deadline. … Read more…

How supercontinents and superoceans affect seafloor roughness

Tasman Sea grav SW Indian grav Pacific grav

Seafloor roughness varies considerably across the world’s ocean basins and is fundamental to controlling the circulation and mixing of heat in the ocean and dissipating eddy kinetic energy. Models derived from analyses of active mid-ocean ridges suggest that ocean floor roughness depends on seafloor spreading rates, with rougher basement forming below a half-spreading rate threshold of 30-35 mm/yr, as well as on the local interaction of mid-ocean ridges with mantle plumes or cold-spots.
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Generic Mapping Tools (GMT)

GMT is an open source collection of about 80 command-line tools for manipulating geographic and Cartesian data sets (including filtering, trend fitting, gridding, projecting, etc.) and producing PostScript illustrations ranging from simple x–y plots via contour maps to artificially illuminated surfaces and 3D perspective views; the GMT supplements add another 40 more specialized and discipline-specific … Read more…