. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography ] -AtjvwiVV~^>\A^*vMAr^^|,! Fig 3. Profile 71 '2 (top) and the corresponding synthetic profile computed bv using the method in Heirtzler et al. [1962]. The magnetic chronology of Heirizler ei al. [1968] was used with modifications of the 0- to , interval as was suggested by Cox [1971]; the center of spreading bears °T. and the profile is oriented I05°T. Other parameters of the model are as follows: J = 2400. 1200. and 800 X 1
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography ] -AtjvwiVV~^>\A^*vMAr^^|,! Fig 3. Profile 71 '2 (top) and the corresponding synthetic profile computed bv using the method in Heirtzler et al. [1962]. The magnetic chronology of Heirizler ei al. [1968] was used with modifications of the 0- to , interval as was suggested by Cox [1971]; the center of spreading bears °T. and the profile is oriented I05°T. Other parameters of the model are as follows: J = 2400. 1200. and 800 X 10"! emu for the median anomaly, anomalies 1-5. and anomalies beyond 5. respectively: D = 341°. / = °: thickness of magnetic source layer is 0 4 km: depth to magnetic source layer is km; depth to magnetic source layer is variable (average values are obtained from the bathymetric profile) Profile 71 '2 also shows that the center of symmetry varies slightly for different anomalies, 1. 5, and 13. The spreading rates are based on the chronology of Pitman et al. [19711. 10 and 15 my. and centered about 30 my. Minor asymmetries in the anomaly pattern and degradation of the amplitude, and definition of the individual anomalies are con- sistent with formation of the mid-Ailantic ridge by dike injec- tion over a relatively wide zone in a manner proposed by Matthews and Bath [1967] and Vine and Morgan [1967]. O 4i Z 5 r-e - */>\ •^*->j r J -u2- < . i. ~h r — T , f~W z£i- UJ *1 ! LLlr-' 1-1 at < £ o < 0 10 20 30 40 50 60 70 MY Fig. 4. Apparent half rates of sea floor spreading determined for profile 71/2. based on the chronology of Pitman et al [1971]: W and E indicate west and east of the mid-Atlantic ridge axis. Acknowledgments Study of the magnetic data collected during the 1970 and 1971 TAG investigations was supported by funds from the National Science Foundation International Decade of Ocean Ex- ploration. R S Dietz gave help
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