NDLI: High-Technology Investigations Of Rift Propogation And Plate Tectonics

Content Provider	IEEE Xplore Digital Library
Author	Hey, R.
Copyright Year	1983
Description	Author affiliation: Scripps Institution of Oceanography, La Jolla, CA, USA (Hey, R.)
Abstract	Plate tectonics as originally formulated was so successful in revolutionizing geology that only very few modifications have been necessary. One of these modifications is the suggestion that spreading centers sometimes increase their length by propagation, progressively rifting apart preexisting lithospheric plates and reorganizing the Earth's plate boundary geometry. This small change to plate tectonic theory, known as the propagating rift hypothesis, provides a mechanistic explanation for a wide variety of tectonic puzzles, including the existence of a large class of seafloor and continental margin features which are oblique to both relative and absolute plate motion and thus were inexplicable and seemingly incompatible with previous plate tectonic theory, as well as for the occurrence of spreading center jumps and zones of unusually differentiated FeTi basalts. In addition to routine marine geophysical survey techniques the phenomenon of rift propagation has been investigated with Gloria, Seabeam, Deep-Tow, Sea Marc I, ocean bottom seismometers and transponder-navigated dredging, and ALVIN and ANGUS work is anticipated. We have just completed a very successful investigation of the GalapagosW propagating rift system using the new Scripps Seabeam system on the R/V Thomas Washington and the Deep-Tow system of the Marine Physical Lab at Scripps. This was the first time Seabeam and Deep-Tow were used together (except on short test cruises), and the combination is proving to be very powerful in understanding seafloor tectonic evolution. In addition, we were fortunate to have the new NAVSTAR Global Positioning System operating throughout the cruise, providing navigational accuracy of a few tens of meters during the 4-8 hrs/day of favorable satellite geometry, as well as the Deep-Tow transponder navigation net. Our results strongly corroborate the propagating rift hypothesis and indicate that this hypothesis can be confidently added to plate tectonic theory. Furthermore, it's clear that if this process continues for many millions of years it will have important implications for large-scale plate tectonic evolution and that propagating rifting of continental and oceanic plates may have important economic implications.
Starting Page	791
Ending Page	796
File Size	575657
Page Count	6
File Format	PDF
DOI	10.1109/OCEANS.1983.1152100
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1983-08-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sea floor Geology Earth Geometry Testing Satellite navigation systems Oceans Transponders Large-scale systems Power generation economics
Content Type	Text
Resource Type	Article

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