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- Ninety_East_Ridge abstract "The Ninety East Ridge (also rendered as Ninetyeast Ridge, 90E Ridge or 90°E Ridge) is a linear, age-progressive seamount chain in the Indian Ocean and is named for its near-parallel strike along the 90th meridian. It is approximately 5,000 kilometres (3,100 mi) in length and can be traced topographically from the Bay of Bengal southward towards the Southeast Indian Ridge (SEIR), though the feature continues to the north where it is hidden beneath the sediments of the Bengal Fan. The ridge extends between latitudes 33°S and 17°N and has an average width of 200 km.The ridge divides the Indian Ocean into the West and East Indian Ocean. The northeastern side is named the Wharton Basin and ceases at the western end of the Diamantina Fracture Zone which passes to the east and almost to the Australian continent.The ridge is primarily composed of Ocean Island Tholeiites (OIT), a subset of basalt which increase in age from approximately 43.2 ± 0.5 Ma in the south to 81.8 ± 2.6 Ma in the north though a more recent analysis using modern Ar-Ar techniques is currently pending publication. This age progression has led geologists to theorize that a hotspot in the mantle beneath the Indo-Australian Plate created the ridge as the plate has moved northward in the late Mesozoic and Cenozoic. This theory is supported by a detailed analysis of the chemistry of the Kerguelen Plateau and Rajmahal Traps, which together, geologists believe, represent the flood basalts erupted at the initiation of volcanism at the Kerguelen hotspot which was then sheared in two as the Indian subcontinent moved northward. However, the existence of so-called deep mantle hotspots is currently a topic of debate in the geologic community, with a few geochemists favoring an alternative hypothesis which postulates a much shallower origin for hotspot volcanism.The ridge has been surveyed several times in the past, including several times by the Deep Sea Drilling Program (DSDP). In 2007, the RV Roger Revelle collected bathymetric, magnetic and seismic data together with dredge samples from nine sites along the ridge as part of an Integrated Ocean Drilling Program (IODP) site survey intended to examine the hotspot hypothesis for the ridge.It had been assumed that the India and Australia are on a single tectonic plate for at least the last 32 million years. However, considering the high level of large earthquakes in the Ninety East Ridge area and the evidence of deformation in the central Indian Ocean, it is more appropriate to consider the deformed region in the central Indian Ocean as a broad plate boundary zone separating the Indian Plate and the Australian Plate.".
- Ninety_East_Ridge thumbnail NinetyEastRidge.jpg?width=300.
- Ninety_East_Ridge wikiPageExternalLink KNOX06RR_CruiseRept.pdf.
- Ninety_East_Ridge wikiPageExternalLink 33960?show=full.
- Ninety_East_Ridge wikiPageID "16735478".
- Ninety_East_Ridge wikiPageRevisionID "592653241".
- Ninety_East_Ridge hasPhotoCollection Ninety_East_Ridge.
- Ninety_East_Ridge subject Category:Plate_tectonics.
- Ninety_East_Ridge subject Category:Seamount_chains.
- Ninety_East_Ridge subject Category:Underwater_ridges_of_the_Indian_Ocean.
- Ninety_East_Ridge point "-3.0 90.0".
- Ninety_East_Ridge type GeologicalFormation109287968.
- Ninety_East_Ridge type NaturalElevation109366317.
- Ninety_East_Ridge type Object100002684.
- Ninety_East_Ridge type PhysicalEntity100001930.
- Ninety_East_Ridge type Ridge109409512.
- Ninety_East_Ridge type UnderwaterRidgesOfTheIndianOcean.
- Ninety_East_Ridge type YagoGeoEntity.
- Ninety_East_Ridge type YagoPermanentlyLocatedEntity.
- Ninety_East_Ridge type SpatialThing.
- Ninety_East_Ridge comment "The Ninety East Ridge (also rendered as Ninetyeast Ridge, 90E Ridge or 90°E Ridge) is a linear, age-progressive seamount chain in the Indian Ocean and is named for its near-parallel strike along the 90th meridian. It is approximately 5,000 kilometres (3,100 mi) in length and can be traced topographically from the Bay of Bengal southward towards the Southeast Indian Ridge (SEIR), though the feature continues to the north where it is hidden beneath the sediments of the Bengal Fan.".
- Ninety_East_Ridge label "Grzbiet Wschodnioindyjski".
- Ninety_East_Ridge label "Ninety East Ridge".
- Ninety_East_Ridge label "Ride du 90° Est".
- Ninety_East_Ridge label "Восточно-Индийский хребет".
- Ninety_East_Ridge label "東経90度海嶺".
- Ninety_East_Ridge label "東經九十度洋脊".
- Ninety_East_Ridge sameAs Ride_du_90°_Est.
- Ninety_East_Ridge sameAs 東経90度海嶺.
- Ninety_East_Ridge sameAs 동경_90도_해령.
- Ninety_East_Ridge sameAs Grzbiet_Wschodnioindyjski.
- Ninety_East_Ridge sameAs m.0404k7y.
- Ninety_East_Ridge sameAs Q2599522.
- Ninety_East_Ridge sameAs Q2599522.
- Ninety_East_Ridge sameAs Ninety_East_Ridge.
- Ninety_East_Ridge lat "-3.0".
- Ninety_East_Ridge long "90.0".
- Ninety_East_Ridge wasDerivedFrom Ninety_East_Ridge?oldid=592653241.
- Ninety_East_Ridge depiction NinetyEastRidge.jpg.
- Ninety_East_Ridge isPrimaryTopicOf Ninety_East_Ridge.