MESOZOIC PLATE POLYGON MODEL
(NEW PACIFIC MODEL) 

By Torsvik et al. (2019)

FILE DESCRIPTION

1. Global_Model_R.gproj [GPlates project file that will load all files below]
2. Global_Model_R.rot [GPlates rotation file 0-250 Ma]*1
3. Global_Model_R.gplm [GPlates Dynamic plate polygon model]*1
4. Pacific_LIPS.gplm [Pacific LIP polygons used in this paper]
5. PGZ_s10mean.gplm [Plume generation zones; s10mean 0.9% slow contour]*2
6. s10mean.63.2800.gpml [s10mean grid model at 2800 km depth]*2
7. tomoTHT.cpt [grid palette used with s10mean model] 

ROTATION FILE

The original rotation file is that of Matthews et al. (2016; GPlates 2.0 default) but modifications include:

(i) revised Pacific extension from 83.5 to 150 Ma (Model R developed here),
(ii) critical plate circuits adjusted to conform with GMHRF-3 (Doubrovine et al., 2012) and those used to develop the global apparent polar wander path in Torsvik et al. (2012), and
(iii) implemented a switch between mantle (Plate Id. = 0) and paleomagnetic (Plate Id. = 1) reference frame.

Adjusted rotations are marked with “CEED” in the right-hand comment/information column, the rotation file works back to 250 Ma, and can be used to reconstruct all other files supplied with GPlates.

At start-up, the GPlates software defaults to a mantle frame (Plate Id = 0). In order to show our reconstructions with respect to the spin-axis (palaeomagnetic or paleogeographic frame), select option “Reconstruction”, sub-option “Specify Anchored Plate ID”, and type 1.

DYNAMIC PLATE POLYGON MODEL 

We use the model of Matthews et al. (2016) back to 250 Ma (Default GPlates 2.0) but because we have revised critical plate circuits and rotation poles (including a new Model R for the Pacific), the polygon model required many modifications to close the polygons appropriately. We have not added new plates or done radical changes in the original plate polygon model. 

References:
Doubrovine, P.V., Steinberger, B. & Torsvik, T.H. 2012.  Absolute plate motions in a reference frame defined by moving hotspots in the Pacific, Atlantic and Indian oceans. Journal Geophysical Research, 117, B09101, doi:10.1029/2011JB009072.

Matthews et al. 2016. Global plate boundary evolution and kinematics since the late Paleozoic. Global and Planetary Change 146, 226–50.

Torsvik, T. H. et al. 2012. Phanerozoic polar wander, paleogeography and dynamics. Earth Sci. Rev. 114, 325–368. 

EARTHBYTE MODEL (GPlates 2.0/2.1) adapted to Pacific Model R

1.EARTHBYTE_Model_R.gproj that will load the following files:
2.EARTHBYTE_Rotation_Model_R.rot [GPlates rotation file 0-250 Ma]
3.EARTHBYTE_Plate_Model_R_.gpml [GPlates Dynamic plate polygon model]

Files 2-3 are the original files of Matthews et al. (2016) but the rotation file (0-250 Ma) has been adapted to our Pacific Model R, which also required changes in the dynamic plate polygon model.

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