cent synthesis considered southeast Asia as a cluster of several 

 small blocks which have behaved since the Triassic as a single 

 unit together with the South China Sea but which have separate 

 histories before the late Paleozoic. 



3. How can discontinuities of the zonal distribution of 

 minerals be explained, such as the lack of porphyry copper 

 deposits in Japan, notwithstanding discoveries in the Philip- 

 pines and the island arcs extending to the south? What is the 

 significance of the sudden termination east of Belitung of the 

 tin-tungsten belt which runs from Burma to the Indonesian 

 tin islands? Are tin concentrations confined to a Cordilleran- 

 type orogeny within a continent, in which the continent is 

 pushing forward and the oceanic plate is fixed? Are copper, 

 lead, zinc, gold, silver, arsenic, and antimony characteristic 

 mineral deposits of island arcs lying off a continent, in which 

 the continental plate is fixed and the oceanic plate advancing? 



4. What portion of sediments on a subducting plate is 

 carried down to the subduction zone to be metamorphosed or 

 consumed, and what portion is scraped off and uplifted with the 

 outer arc islands such as those of the Indonesian archipelago 

 (Mentawai Islands, Timor, etc.)? Geologically this is recognized 

 as an important problem that has significant economic implica- 

 tions for both metalliferous ore or hydrocarbon accumulation. 



5. Why do some uplifted arc areas such as the eastern 

 arc of Sulawesi contain ophiolites derived from the oceanic- 

 type crust, with possible nickel, chromite, and copper deposits, 

 whereas other arc segments such as Timor and Ceram are 

 composed of sedimentary sequences with hydrocarbon shows? 



6. Are hydrocarbons more likely to be found in foreland 

 basins, formed inward of the volcanic/plutonic arcs, or do the 

 marginal semienclosed trenches also represent promising areas? 

 In the latter, restricted circulation resulting in low oxygen re- 

 plenishment and preservation of organic rrratter would improve 

 the likelihood of hydrocarbon generation. 



The Workshop reviewed ongoing work in the region and 

 relevant theoretical work elsewhere in five categories — tectonics, 

 geophysics, sedimentary processes, metallogenesis and petro- 

 genesis, and heat flow and maturation of hydrocarbons. The 

 Workshop is described in Metallogenesis, Hydrocarbons, and 

 Tectonic Patterns in Eastern Asia — A Programme of Research 

 (preliminary draft). Report of the IDOE Workshop on Tec- 

 tonic Patterns and Metallogenesis in East and Southeast Asia, 

 Bangkok, Thailand, 24-29 September 1973, published by Com- 

 mittee for Coordination of Joint Prospecting for Mineral Re- 

 sources in Asian Offshore Areas (CCOP) and by Intergovern- 

 mental Oceanographic Commission (IOC), UNESCO, No- 

 vember 1973, issued by the Office of the Project Manager/ 

 Co-ordinator, UNDP Technical Support for Regional Offshore 

 Prospecting in East Asia. 



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Barazangi, M., and J. Dorman. World Seismicity Maps Com- 

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