TORONTO GEOLOGICAL DISCUSSION GROUP
The TGDG talks for the 2004-2005 season will continue with the following meetings on October 12, 2004 and October 26, 2004. The meetings will be held at the Ontario Club, 5th Floor, Commerce Court South Building, at the corner of Wellington and Bay Streets. October 12, 2004 at 4.00 p.m. Dr. Terry Bottrill The Recently Revised Model of Plate Tectonics and its Use in Mineral Deposits Geology Following the very important paper by Warren Hamilton in the November 2003 issue of GSAToday on "The Alternative Earth" (available on the GSA web-site at ftp://rock.geosociety.org/pub/GSAToday/gt0311.pdf,) the sources referred to by Hamilton have been reviewed, together with many others. Many of the aspects of the revised plate tectonic model described by Hamilton and others have major implications for our understanding of various ore forming processes. Various aspects of the revised model indicate that there may be some quite different explanations for many types of mineral deposits and the changes in deposit types since the Archaean. Some of the aspects of the revised model are as diverse as the original formation of the planet and its subsequent tectonic history, through to the origin and evolution of life on Earth. Altogether, the facts accumulated from subjects as diverse as astronomy, solid earth physics and palaeontology demonstrate that the revised model as recently proposed provides a more predictive and consistent framework for explaining many aspects of geology. The original plate tectonic model was developed in the 1960's following some major advances in geophysics (sea floor magnetic stripes). A large amount of additional geochemical and geophysical data has accumulated in the intervening 40 years which indicate that the original model as broadly accepted and used is due for some major revisions. Like the original, the revised plate tectonic model is also based in large part on recent developments in geophysics, particularly from 3-D seismic surveys of the crust and upper mantle. A longer half-day session has been proposed for early next year to help obtain a better understanding of these important new geological ideas and their implications in economic geology. It is hoped that your reactions to this short introduction to the subject will help us plan and decide on a format for a meeting where these new ideas could be presented in greater detail by the people who have actually developed them. A few prints of the Hamilton paper will be available at the meeting. October 26, 2004 at 4.00 p.m. Mr. Lee Barker, President, Sparton Resources Inc. Success in China: The Luxi Story Sparton acquired the Luxi property in southwest China and has commenced diamond drilling of the property with marked success. The Luxi story will be updated for members. Membership is now due and remains unchanged at $25.00. |
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