Description D'Entrecasteaux Islands

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topographic map of d entrecasteaux islands. large islands northwest southeast: goodenough, fergusson , normanby.


the 3 principal islands, northwest southeast, goodenough (nidula), across moresby straight fergusson (moratau), largest of three, , across dawson straight normanby (duau). in addition there numerous small islands , reefs. sanaroa , dobu significant of smaller islands, while sori or wild named hms challenger s artist, john james wild. highest peak in group 2,536 metres (8,320 ft) mount vineuo on goodenough island.


the d entrecasteaux islands volcanically active, number of areas of historic/geologic volcanism , active geothermal fields. fergusson island has 3 volcanic masses on 1,828 m high. there geothermal areas in south east area of goodenough island , bwabwadana , iamalele on fergusson island. particularly active hot springs located @ deidei on fergusson. between fergusson , normanby islands dawson straights group has several volcanic centres may define partly submerged caldera; 1 of cones on southwestern fergusson island may have erupted in 1350. geologically islands largely made of rock once belonged northern edge of australian plate thrust deep earth s crust plate collision. burial of these rocks great depths (where encountered correspondingly high temperatures) metamorphosed rocks eclogite facies: >2gpa , >700˚c. specifically, these islands play host youngest known coesite-eclogite sample; ca-tims dating of zircons within sample dates formation ~5ma, meaning has been exhumed depth of ~100 km @ remarkable rate of ~20mm/yr. rock @ centre of tall domes in these islands deep in earth. on short time, geologically speaking, these packets of rocks have ascended through earth s shallow mantle , pushed through crust form gneiss domes find today - vestiges of crust these massifs have thrust through still draped carapaces on edges of domes. these islands thought geophysically significant because lie ahead of west-most rift tip of woodlark spreading centre, has been propagating westwards continent. d entrecasteaux represent stage of continental breakup preceding fully-fledged volcanic spreading.








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