Abstract
The ridge like seafloor highs with various geological origins can be classed into mid-ocean ridges, transverse ridges related to transform faults, hot spot/mantle plume originated ridges, microcontinent rifted from major continent, intra-plate arc formed by interaction of two oceanic plates, and tectonic ridges uplifted by later tectonic activity. Those ridges moved towards the convergent continental margins along with the underlain plate drifting and formed so-called accreted ridges commonly trending at a high angle to the continental margins. At divergent continental margins, the continental crusts were extended and thinned accompanying with magmatism, which formed high terrains protruding or parallel to the coastal line. The ridges worldwide have various origins and the crustal thicknesses and structures of them are diversity. The crusts beneath the microcontinents, and the transverse ridges along the transform margin, and the seafloor highs beside the passive continental margins are continental, while the crusts of other ridges are oceanic. Article 76 of the United Nations Convention on the Law of the Sea (UNCLOS) has classed the seafloor highs worldwide into three legal categories, namely oceanic ridges, submarine ridges and submarine elevations, for the purpose to delineate the outer limit of the coastal States’ continental shelf beyond 200 nautical miles. To define the categories of the legal seafloor highs to which the ridges with various geological origins belong, the continuities in morphology and geology including the rock types, crustal structures, origins and tectonic setting of the ridges and the coastal States’ land mass with its submerged prolongation should be taken into account. If a ridge is continuous both in morphology and geology with the coastal States’ land mass and its submerged prolongation, it is a submarine elevation stipulated in Article 76. If it is discontinuous in morphology, the ridge should be regarded as oceanic ridges. If a ridge is continuous in morphology but discontinuous in geology with the coastal States’ land mass and its submerged prolongation, then it is a submarine ridge as stipulated in Article 76.
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References
Abrams L J, Detrick R S, Fox P J. 1988. Morphology and crustal structure of the Kane Fracture Zone Transverse Ridge. Journal of Geophysical Research, 93(B4): 3195–3210
Basile C, Mascle J, Popoff M, et al. 1993. The Côte d’Ivoire-Ghana transform margin: a marginal ridge structure deduced form seismic data. Tectonophysics, 222: 1–19
Bonatti E, Hamlyn P R. 1978. Mantle uplifted block in the Western Indian Ocean. Science, 201: 249–251
Brekke H, Symonds P A. 2004. The Ridge Provisions of Article 76 of the UN Convention on the Law of the Sea. In: Nordquist M H, Moore J N, Heidar T, ed. Legal and Scientific Aspects of Continental Shelf Limets. Boston: Martinus Nijhoff Publishers, 169–199
Bunch A W H. 1979. A detailed seismic structure of Rockall Bank (55°N, 15°W): A synthetic seismogram analysis. Earth and Planetary Scientific Letters, 35: 453–463
Burke K C, Wilson J T. 1976. Hot spots on the Earth’s surface. Journal of Geophysical Research, 93: 7690–7708
Caress D W, McNutt M K, Detrick R S, et al. 1995. Seismic imaging of hotspot-related crustal underplating beneath the Marquesas Island. Nature, 383: 600–603
Christensen N I, Mooney W D. 1995. Seismic velocity structure and composition of the continental crust: a global review. Journal of Geophysical Reaearch, 100: 9761–9788
Coffin M F, Eldholm O. 1994. Large igneous provinces: crustal structure, dimensions, and external consequences. Review of Geophysics, 32(1): 1–36
Collier J S, Minshull T A, Kendall J M, et al. 2004. Rapid continental breakup and microcotinent formation in the Western Indian Ocean. EOS, 85(46): 481–496
Dick H J B, Natland J H, Ildefonse B. 2006. Past and future impact of deep drilling in the oceanic crust and mantle. Oceanography, 19(4): 72–80
Duncan R A, Backman J, Peterson L C. 1990. The Volcanic record of the Reunion hotspot. In: Proceedings of the Ocean Drilling Program, Scientific Results 115, College Station, TX (Ocean Drilling Program), 3–10
Eldholm O, Shogseid J, Planke S, et al. 1995. Volcanic margin concepts. In: Banda E, ed. Rifted ocean-continent boundaries. Nenerland: Kluwer Acaclemic Publishers, 1–16
Fitton J G, Mahoney J J, Wallace P J, et al. 2004. Leg 192 Synthesis: Origin and Evolution of the Ontong Java Plateau. In: Fitton J G, Mahoney J J, Wallace P J, et al., ed. Proceedings of the Ocean Drilling Program, Scientific Results, 192. College Station, TX (Ocean Drilling Program), 1–18
Flanagan M P, Wiens D A. 1998. Attenuation of Broadband P and S waves in Tonga: observations of frequency dependent Q. Pure and Applied Geophysics, 153: 345–375
Galindo-Zaldívar J, Jabaloy A, Maldonado A, et al. 2000. Deep crustal structure of the area of intersection between the Shackleton Fracture Zone and the West Scotia Ridge (Drake Passage, Antarctica). Tectonophysics, 320: 123–139
Gladczenko T P, Coffin M Fm, Eldholm O. 1997. Crustal structure of the Ontong Java Plateau: Modeling of new gravity and existing seismic data. Journal of Geophysical Research, 102(B10): 22711–22729
Gràcia E, Escartîn J. 1990. Crustal accretion at midocean ridges and backarc spreading centers: Insights from the Mid-Atlantic Ridge, the Bransfield basin and the North Fiji Basin. Contributions to Science, 1(2): 175–192
Grevemeyer I, Flueh E R, Reichert C, et al. 2001. Crustal architecture and deep structure of the Ninetyeast Ridge hotspot trail from active-source ocean bottom seismology. Geophysical Journal International, 144: 414–431
Holbrook W S. 1995. Underplating over hotspots. Nature, 373: 559
Holbrook W S, Lizarralde D, McGeary S, et al. 1999. Structure and composition of the Aleutian island arc and implication for continental crustal growth. Geology, 27: 31–34
Howell D G, Jones D L. 1989. Terrane analysis: a circum-Pacific overview. In: Ben-Avraham Z, ed. The Evolution of the Pacific Ocean Margins. New York: Oxford Press, 36–40
Iyer S D, Ray D. 2003. Structure, tectonic and petrology of mid-oceanic ridges and the Indian scenario. Current Science, 85(3): 277–289
Kelemen P B, Holbrook W S. 1995. Origin of thick high-velocity igneous crust along the U.S. east coast margin. Journal of Geophysical Research, 100: 10007–10094
Klingelhöfer K, Minshull T A, Blackman D K, et al. 2001. Crustal structure of Ascension Island from wide-angle seismic data: implications for the formation of near-ridge volcanic islands. Earth and Planetary Science Letters, 190: 41–56
Klingelhöfer K, Minshull T A, Blackman D K, et al. 2001. Crustal Structure of Ascension Island from wide-angle seismic data: implications for the formation of near-ridge volcanic islands. Scismological evidence for variable growth of crust along the Izu intraoceanic arc. Journal of Geophysical Research, 112: 1–25
Mascle J, Lohmann G P, Clift P D, et al. 1996. Proceeding of the ODP Initial Reports 159. Collage Station, TX (Ocean Drilling Program), 47–60
Morgan J V, Barton P J, Write R S. 1989. The Hatton Bank continental margin-III. Structure from wide-angle OBS and multichannel seismic refraction profiles. Geophysical Journal International, 98: 367–384
Muller M R, Robinson C J, Minshull T A, et al. 1997. Thin crust beneath ocean drilling program borehole 735B at the Southwest Indian Ridge? Earth and Planetary Science Letters, 148: 93–107
Müller R D, Gaina C, Roest W R, et al. 2001. A recipe for microcontinent formation. Geology, 29(3): 203–206
Nandan S N, Rosenne S. 1995. United Nations Convention on the Law of the Sea, a Commentary: v 2. Center for Oceans and Policy. London: University of Virginia School of Law, 1–1040
Nishizawa A, Kaneda K, Katagirl Y, et al. 2007. Variation in crustal structure along the Kyushu-Palau Ridge at 15–21°N on the Philippine Sea plate based on seismic refraction profiles. Earth Planets Space, 59: e17–e20
Officer C B. 1955. Southwest Pacific crustal structure. Transaction of the American Geophysical Union, 36(3): 449–459
Party S S. 1989. Background and summary of drilling results-Owen Ridge. In: Prell W L, Niitsuma N, et al., eds. Proceeding of the ODP Initial Reports 117. College Station, TX (Ocean Drilling Program), 35–42
Royer J Y, Peirce J W, Weissel J K. 1991. Tectonic constraints on the hotspot formation of Ninetyeast Ridge. In: Weissel J, Peirce J W, Taylor, et al., eds. Proceedings of the Ocean Drilling Program, Scientific Results, 121. College Station, TX (Ocean Drilling Program), 763–776
Sage E B, Pontoise J, Mascle J, et al. 1997. Crustal Structure and Ocean-Continent Transition at Marginal Ridge: the Côte d’Ivoire-Ghana Marginal Ridge. Geo-Marine Letters, 17: 40–48
Sallarès V, Calahorrano A. 2007. Geophysical characterization of mantle melting anomalies: a crustal view. In: Foulger G R, Jurdy D M, eds. Plates, Plumes, and Planetary Processed: Geological Society of America Special Paper, 430, 507–524
Smith L K, White R S, Kusznir N J, et al. 2005. Structure of the Hatton Basin and adjacent continental margin. In: Dore A G, Vining B A, eds. Petroleum Geology: North-West Europe and Global Perspectives-Proceeding of the 6th Petroleum Geology Conference. London: Petroleum Geology Conferences Ltd, 947–956
Stephens W E, Plummer P S, Joseph P R. 1995. Rifting and the Isolation of Microcontinents: Tectono-Magnatic evolution of Seychelles and Associated contimental fragments in the Western India Ocean, A Research Proposal. Submitted to Joides, 1–71
Suarez S V. 2008. The Outer Limits of the Continental Shelf Legal Aspects of their Establishment. New York: Springer, 1–276
Suyehiro K, Takahashi N, Ariie Y, et al. 1996. Continental Crust, Crustal Underplating, and Low-Q Upper Mantle Beneath an Oceanic Island Arc. Science, 273: 390–392
Symonds P A, Brekke H. 2004. A Scientific Overview of Ridges Related to Article 76 of the UN Convention on the Law of the Sea. In: Nordquist M H, Moore J N, Heidar T, eds. Legal and Scientific Aspects of Continental Shelf Limets. Boston: Martinus Nijhoff Publishers, 141–167
Symonds P A, Coffin M F, Taft G, et al. 2000. Ridge issues. In: Cook P J, Carleton C M, eds. Continental Shelf Limits-the Scientific and Legal interface. New York: Oxford University Press, 285–307
Takahashi N, Kodaira S, Tatsumi Y, et al. 2008. Structure and growth of the Izu-Bonin-Mariana arc crust: 1. Seismic constraint on crust and mantle structure of the Mariana arc-back-arc system. Journal of Geophysical Research, 113: 1–18
Taylor B. 2006. The single largest oceanic plateau: Ontong Java-Manihiki-Hikurangi. Earth and Planetary Science Letters, 241: 372–380
Tejada M L G, Mahoney J J, Neal C R, et al. 2002. Basement geochemistry and geochronology of Central Malaita, Solomon Islands, with implications for the origin and evolution of the Ontong Java Plateau. Journal of Petrology, 43: 449–484
The Open University. 1989. The Ocean Basins: Their Structure and Evolution. Oxford: Pergamon Press, 1–185
United Nations. 1983. The Law of the Sea, Officeal Text of the United Nations Convention on the Law of the Sea with Annexes and Index, United Nations Publication Sales No. E.83.V.5. New York: United Nations, 49–51
United Nations. 1993. The Law of the Sea, Definition of the Continental Shelf: An Examination of the Relevant Provisions of the United Nations Convention on the Low of the Sea. New York: United Nations Publication, 1–30
United Nations. 1999. Scientific and Technical Guidelines of the Commission on the Limits of the Continental Shelf. New York: United Nations, 52–56
Wang T, Lin J, Tucholke B, et al. 2010. Crustal thickness anomalies in the North Atlantic Ocean basin from gravity analysis. Geochemistry, Geophysics, Geosystems, 12(3): Q0AE02
White R S, McKenzie D, O’Nions R K. 1992. Oceanic Crustal Thickness from Seismic Measurements and Rare Earth Element Inversions. Journal of Geophysical Research, 97(B13): 19683–19715
Whitmarsh R B. 1979. The Owen Basin off the southeast margin of Arabia and the evolution of the Owen Fracture Zone. Geophysical Journal of the Royal Astronomical Society, 58(2): 441–470
Wilson J T. 1965. Evidence from oceanic islands suggesting movement in the Earth. Philosophical Transactions of the Royal Society, 258: 145–167
Wood R, Stagpoole V, Wright I, et al. 2003. New Zealand’s Continental shelf and UNCLOS Article 76. In: Institute of Geological & Nuclear Sciences information, ed. NIWA technical report 123. Wellington: National Institute of Water and Atmospheric Research, 56
Wyllie P J. 1971. The Dynamic Earth: Textbook in Geosciences. New York: John Wiley and Sons Inc, 171
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Wang, W. Geological structures of ridges with relation to the definition of three types of seafloor highs stipulated in Article 76. Acta Oceanol. Sin. 30, 125–140 (2011). https://doi.org/10.1007/s13131-011-0154-z
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DOI: https://doi.org/10.1007/s13131-011-0154-z