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14 zones. This group will evaluate the tectonic positions of Caribbean terranes, plates and subduction zones taking into account geochronology, geochemistry and paleomagnetics. WG-7. Paleontological support of Caribbean Paleogeography. The purpose of this group is to study the fossil assemblages - marine and terrestrial - of different ages in distinct terranes, and identify the biogeographic and paleogeographic implications of its occurrences, with special focus on their input toward understanding the positioning of the terranes in selected time-frames. WG-8. Geochronological, Geochemical and Paleomagnetic control of the historic position of terrenes, plates and subduction zones. This group will evaluate the tectonic positions of Caribbean terranes, plates and subduction zones taking into account geochronology, geochemistry and paleomagnetics. WG-9. Origin, composition and age of the Caribbean oceanic lithosphere. This group will investigate the occurrence of oceanic crust of different ages within the Caribbean, both in the present marine basins and regions of obducted lithosphere. NETWORKING The network of the project is based on two main Internet sites, a WebSite (http://www.ig.utexas.edu/CaribPlate/CaribPlate.html) (carib@yahoogroups.com). and an email discussion group The WebSite is intended to provide current information on Caribbean tectonics; it is updated generally every two months. At this site is found the full text of the project, references to papers dedicated to the Caribbean geology, direct access to existing Caribbean Plate Tectonic models, a list of forthcoming meetings and workshops, important news, and a forum section, which may be used to post questions and data related to specific topics. For example, presently in the forum are well-illustrated discussions of major problems associated with present tectonic models and the problems concerning the early opening of the Caribbean. Links to related WebSites may also be found. More than 3000 hits are recorded until August, 2001. The e-group was created in order to have a more active forum for the exchange of information. Subscribers to the Egroup will automatically receive all messages relevant to the project. The site is presently being used to direct attention to new information posted on the web, new publications, updates of forthcoming activities, and in a lesser degree, to post questions. As the project develops, the e-group has become an active forum for discussion of key geological problems and spread important information. 14
6.2 SCIENTIFIC MEETINGS AND WORKSHOP REPORTS 15 GENERAL SYMPOSIUM 17-6. CARIBBEAN PLATE TECTONICS, ORIGIN AND EVOLUTION. 31 INTERNATIONAL GEOLOGICAL CONGRESS, RÍO DE JANEIRO August 6 to 17, 2000 Conveners: Manuel A. Iturralde-Vinent and Edward G. Lidiak This symposium was dedicated to analyzing the present status of Caribbean Plate Tectonic models. Four special oral presentations and 12 posters were the subject of interesting debates and active exchange of data and interpretations. The oral session, attended by more than 50 persons, was celebrated the morning of August 7th. Four special speakers presented their respective viewpoints concerning how they understand the formation and evolution of the Caribbean, but the fact is that each one produced a quite distinct scenario. In this regard, it is important to quote the senior convener, in the fact that "The Caribbean is a singular area of planet Earth, and therefore, it had had a single history". The plate tectonic models that explain the Caribbean plate as an allochthonous crust originated within the Pacific Ocean, was very well exemplified by the model of J. Pindell and L. Kennan. The special speaker Martin Meschede reviewed some shortcomings of recent Pindell's and Paul Mann's models, and presented his arguments for an in situ origin of the Caribbean plate. Another version of the in situ model was presented by Giuseppe Giunta (visit Comparison at CaribPlate Web Site). M. Iturralde-Vinent, as special speaker, evaluated the few similarities and many contradictions that exist among modern Caribbean Plate Tectonic models (visit Forum at CaribPlate Web Site). The in situ models were criticized because they have a problem of space in explaining the Cretaceous and early Tertiary Greater Antilles-Aves Ridge-Caribbean mountains subduction-related volcanic arcs. Some questions were also raised concerning the polarity of these arcs and the original position of some terranes of the Caribbean margins, subjects that will require more careful attention in the future. Twelve papers were presented at the Poster Session which was held in the afternoon on both August 7th and 8th. They included three of the special oral presentations as well as new results from field research in key areas of Cuba, Puerto Rico, Venezuela, and Costa Rica. This session produced an active exchange of viewpoints among presenting authors, but also with many interested congress members. The conveners and participants agreed that the symposium was an excellent forum for the most valuable exchange of ideas, but as exciting was the possibility to meet people based in different areas of the world with personal expertise and strong interest in the Caribbean. In terms of the scientific impact of the symposium, we concluded that despite the great amount of valuable information available about the Caribbean submarine and land 15
Page 1 and 2: *The information in this report wil
Page 3 and 4: 3 arc at about 120 Ma. However, sev
Page 5 and 6: 5 geometry of the arcs are no longe
Page 7 and 8: ABSTRACTS AND PRESENTATIONS 7 Ander
Page 9 and 10: Pindell, J., Higgs, R., and Kennan,
Page 11 and 12: Coast Ranges) and the Josephine oph
Page 13: to the meeting from Cuba, Jamaica,
Page 17 and 18: 17 west of both of them, and, conse
Page 19 and 20: 19 geology of Cuba were the subject
Page 21 and 22: 21 The aim of the Workshop was for
Page 23 and 24: 23 5. Does the plume source contain
Page 25 and 26: less deformed sedimentary sections,
Page 27 and 28: 27 obscure the equivalent history o
Page 29 and 30: 29 PREMA (Primitive fertile mantle)
Page 31: 31 Lawver, L.A., M.F. Coffin, I.W.D

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