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In Press 



Burckle, L. H., and D. Stanton. In press. Distribution of dis- 

 placed Antarctic diatoms in the Argentine Basin, Nova 

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Dalziel. I. W. D.. and K. F. Palmer. In press. Progressive de- 

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Plate Tectonics and Metallogenesis Studies 



Field activities and continuing study of the Nazca Plate, 

 Mid-Atlantic Ridge, and East and Southeast Asia arc described. 

 Project descriptions, objectives, and accomplishments through 

 April 1974 appear in International Decade of Ocean Explora- 

 tion Progress Report Volume 3, April 1973 to April 1974, 

 December 1974. 



Nazca Plate 



Recent seismic refraction and seismic reflection investi- 

 gations by the Hawaii Institute of Geophysics (HIG), Univer- 

 sity of Hawaii, in the Peru-Chile Trench area (fig. 12), to- 

 gether with analyses of bathymetry, geomorphology, volcanism, 

 and seismicity, indicate significant north-south crustal change 

 along the trench. Other HIG studies have provided a detailed 

 chronological orientation for sea-floor spreading patterns. These 

 show changes in dynamic spreading patterns in the eastern 

 Pacific during the Miocene (about 25 million years before 



Figure 12. — Nazca Plate. 



32 



