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Henrietta Island
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Henrietta Island : ウィキペディア英語版
Henrietta Island

Henrietta Island (, ''Xenriyetta Aryyta'', (ロシア語:Остров Генриетты), ''Ostrov Genriyetty'') is the northernmost island of the De Long archipelago in the East Siberian Sea. 40% of the island is covered with glaciers. Henrietta is roughly circular in shape and its diameter is about 6 km. The closest land is Jeannette Island, located to the ESE.
Cape Melville (Mys Mel'villya), Henrietta's northernmost landhead, is the northernmost point of the De Long Islands, as well as the northernmost land thousands of miles east and west.〔(Mys Mel'villya )〕
==Geology==

Henrietta Island consists of folded Middle Paleozoic basaltic lava and proximal volcanogenic turbidites overlain by Cenozoic clastic sedimentary rocks. The Paleozoic strata have been intruded by numerous sills, dikes, and sheets of basalts, andesite-basalts, and porphyritic diorite. The basalts and porphyritic diorite have been dated by potassium–argon dating method to be about 310-450 million years old and the porphyritic diorite has been dated by the argon–argon dating method to be about 400-440 million years old. Gritstones that are part of the Cenozoic clastic sedimentary rocks contain fragments of underlying Paleozoic strata along with significantly older gneisses, granites, quartzites, and schists.〔Kos’ko, M.K., and G.V. Trufanov, 2002, (''Middle Cretaceous to Eopleistocene Sequences on the New Siberian Islands: an approach to interpret offshore seismic''. ) Marine and Petroleum Geology. vol. 19, no. 7, pp. 901–919.〕〔Vinogradov, V.A., G.I. Kameneva, and G.P. Yavshits, 1975, ''About the Hyperborean platform in view of the new data on geological structure the Henrietta island.'' Arctic tectonics. vol. 1, Leningrad, USSR.〕〔Vinogradov V.A., E.A. Gusev, and B.G. Lopatin, 2006, (''Structure of the Russian Eastern Arctic Shelf'' ) in R.A. Scott and D.K. Thurston, eds., pp. 90–98, Proceedings of the Fourth International conference on Arctic margins, OCS study MMS no. 2006-003, Mineral Management Service, U.S. Department of the Interior, Anchorage, Alaska.〕

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