By Warren B. Hamilton (auth.), Mervin J. Bartholomew, Donald W. Hyndman, David W. Mogk, Robert Mason (eds.)

The eighth foreign convention on Basement Tectonics used to be held in Butte, Montana, August 8-12,1988. traditionally, basement tectonics meetings have interested in such issues as reactivation of faults, the impact of basement faults on metallogeny and hyrocarbon accumulation, and using geophysical and distant sensing options to interpret subsurface and floor geology. The eighth convention diverged from prior meetings in unifying subject was once chosen. simply because old significant terrane or cratonic obstacles are usually postulated to be fault zones that are in this case reactivated, the convention was once equipped to ascertain all elements of old continental margins and terrane limitations and to check more youthful (Mesozoic) ones, approximately which extra is understood, with older (Paleozoic and Precambrian) ones. additionally, as the eighth convention was once held within the northwestern usa, a better emphasis used to be put on the Mesozoic margin of western North the US and the North American safeguard. The seven oral classes and 4 poster periods all handled features of the convention subject matter: characterization and comparability of old continental margins. The organizers expand their because of these people who graciously consented to function moderators for the oral periods: John M. Bartley, Mark S. Gettings, M. Charles Gilbert, John M. Guilbert, Donald W. Hyndman, William P. Leeman, Robert Mason, and A. Krishna Sinha. this system with abstracts quantity used to be ready by way of S. E. Lewis and M. J. Bartholomew.

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ACKNOWLEDGMENTS I thank my colleague R. A. Gibb and referees H. Helmstaedt and E. S. Robinson for various helpful comments which contributed to an overall improvement of this paper. Draftsmen L. Campbell and A. Rafeek and photographer R. Delaunais are thanked for their combined efforts in producing the figures. 22 M. D. Thomas and J. M. BIRD, 1970, Plate tectonics and geosynclines: Tectonophysics, v. 10, p. 625-638. REFERENCES ~_, ALABI, A. , P. A. CAMFIELD, and D. I. GOUGH, 1975, The North American Central Plains conductivity anomaly: Geophysical Journal of the Royal Astronomical Society, v.

D. Thomas 16 GRENVILLE Profile 1 a COlculoted GF -of I -100 o o Km so 40 J. j J I I • I , l 120 J .. I • I I. t. v"'_~ b 20 40 GRE VILLE SUPERIOR · 006 zinger and Gall, 1986). Another factor bearing on improved understanding of suture zones is application of high-resolution reflection seismic profiling. Such an experiment conducted in Lake Huron across an extension of the Grenville Front produced spectacular results (Green and others, 1988,1989), with many reflectors at various crustal levels being imaged.

Detailed studies may reveal it to be a series of anomalies related to discontinuous, en echelon conductors not individually resolved by coarse magnetometer spacing (Thomas and others, 1987). The exact form and significance of this intriguing geophysical anomaly remain to be evaluated. GEOPHYSICAL TRANSECTS ACROSS COLLISIONAL SUTURED MARGINS Following is a presentation of several transects across suture zones in the Canadian Shield (Figures 7-13) selected to display similarities in some cases and differences in others.

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