Opening of the Central Atlantic: Seafloor spreading isochrons and tectonic fabric from SEASAT Altimetry (Paleoceanographic Mapping Project Progress Report No. 21-0687)
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During the last 17 years, at least 9 models for the opening history of the Central Atlantic (between the Azores Fracture zone and Fifteen Twenty Fracture zone) have been proposed (see POMP Progress Report No. 20). The increasing complexity of the plate tectonic models reflects the use of new magnetic data and improved modeling techniques. In this report we outline the procedures and data we have used to produce a revised plate tectonic model describing the opening of the Central Atlantic. Table 1 lists the finite rotation poles we have determined for 19 time slices during the Mesozoic and Cenozoic. Figures 2-5 illustrate our reconstructions for chron 21, 34, MO and 170 Ma. (Blake Spur Magnetic Anomaly).