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赤道印度洋的自然地理学特征是由３个向北延伸的线状高地（Ｎｉｎｅｔｙｅａｓｔ海岭、Ｃｈａｇｏｓ＿Ｌａｃｃａｄｉｖｅ海岭和Ｃａｒｌｓｂｅｒｇ海岭）分隔的一系列盆地组成。在赤道印度洋西部３０３８ｍ水深处钻探了ＯＤＰ７０９Ａ站位,该站位位于Ｍａｄｉｎｇｌｅｙ中脊顶
The natural geography of the equatorial Indian Ocean consists of a series of basins separated by three linear highlands extending north (Ninetyeast Ridge, Chagos_Laccadive Ridge and Carlsberg Ridge). ODP709A station was drilled at a water depth of 3038m in the western equatorial Indian Ocean at the top of the Madingley ridge