|
Detroit Seamount, which was formed around 76 million years ago, is one of the oldest seamounts of the Hawaiian-Emperor seamount chain (Meiji Seamount is the oldest, at 82 million years). It lies near the northernmost end of the chain and is south of Aleutian Islands (near Russia),〔 at 〔(Seamounts Catalog ) by EarthRef, a National Science Foundation Project accessed 3-1-09.〕 It is a seamount in the chain, located north of the hinge of the "V" in the image at right.〔 Detroit Seamount is one of the few seamounts to break the naming scheme of the Emperor seamounts, which are named mostly after emperors or empresses of the Kofun period of Japanese history. It is instead named after the light cruiser ''USS Detroit''. The Detroit Seamount is as big as the island of Hawaii.〔 ==Mapping== The seamount was initially mapped by the GLORIA program of the USGS, and in far more detail in 2001 by leg 197 of the Ocean Drilling Program (ODP). 2001 marked a two-month excursion aboard the research vessel ''JOIDES Resolution'' to collect samples of lava flows from four submerged volcanoes, among them Detroit Seamount, which was drilled twice. The expedition was funded by the Ocean Drilling Program, an international research effort designed to study the world's seafloors, and the drill sites were numbers 1203 through 1206. The project drilled Detroit, Nintoku, and Koko seamounts, all in the far northwest of the chain.〔 Detroit Seamount was drilled twice (numbered 1203 and 1204), on the summit and on one its secondary cones; care was taken to put the locations away from major fault lines or other geological features that would otherwise invalidate or bias the results.〔 In 2005 it underwent a detailed geological analysis by scientists from Stanford University.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Detroit Seamount」の詳細全文を読む スポンサード リンク
|