38:
24:
167:. It was considered to be a prolongation of the Loyalty Ridge by many, but this is questioned by reason of a 200 km (120 mi) gap between the westernmost South d'Entrecasteaux Chain seamount and the northernmost seamount in the Loyalty Ridge and the divergence in magnetic anomaly azimuths. It is a
171:
chain on-top of a broad east–west-trending ridge. The seamounts, including the Sabine Bank which reaches 7 m (23 ft) bsl, are the volcanic remnants of an old island arc. A 4,000 m (13,000 ft)-deep scarp separates the southern ridge from the North
Loyalty Basin to the south. The
224:
back-arc basin-type composition and has an age of 49 ± 10 Ma. This western part of the DER, has an average depth of 3,500 m (11,500 ft), and is bounded to the north by a scarp. The western platform has experienced an Eocene compressional phase followed by Middle
Miocene to
23:
104:
under the
Vanuatu/New Hebrides arc. The subduction of the DER is responsible for the anomalous morphology of the central part of New Hebrides arc whose movement more closely matches the north-east direction of the subducting
45:
136:) to the south from the West Santos Basin (5,400 m (17,700 ft) bsl) to the north. The DER has a western and an eastern part with distinct morphologies: the arcuate western part is an elongated
205:
during the last 2–3 Ma. The northern DER reaches 2,350–2,100 m (7,710–6,890 ft) bsl. Its eastern part has had its basalts reinterpreted by modern compositional reanalysis as
55:
Approximate surface projection on
Pacific Ocean of D'Entrecasteaux Ridge (DER) shaded in brown. Both the North d'Entrecasteaux Ridge and the South d'Entrecasteaux Chain are shown.
213:
between 21 and 38 Ma in age. Accordingly the eastern part of the DER is an abandoned plate boundary which was part of a south-dipping subduction zone before the
Miocene.
658:
565:"4. Observation of forearc seafloor deformation along the North d'Entrecasteaux Ridge - New Hebrides island arc collision zone from Nautile submersible"
229:
uplift and tilt, and indeed the next dredged sample to the north east has a poorly constrained age that is greater than 21 Ma and of primitive arc
144:; the eastern part widens to the east where it has been described to split into a southern and northern ridge. These are separated by the
37:
582:"Eocene and Oligocene basins and ridges of the Coral Sea‐New Caledonia region: Tectonic link between Melanesia, Fiji, and Zealandia"
117:
191:
278:, The central North Fiji basin and New Hebrides arc, and the D'Entrecasteaux ridge and West Torres plateau, pp. 272–273
619:
148:
This has a smooth surface covered by sediments, which is deepening eastward to 4,000 m (13,000 ft) west of
414:"Recent tectonics associated with the subduction/collision of the D'Entrecasteaux zone in the central New Hebrides"
217:
413:
101:
456:
172:
Bougainville Guyot, south of Santos, forms the eastern continuation of the seamount chain and is a Middle
581:
536:
428:
220:, as yet obtained, where the western part starts a curve that transitions to the eastern part, is of
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596:
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106:
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and thus separates the North
Loyalty Basin (4,500–5,000 m (14,800–16,400 ft)
548:
652:
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484:
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86:
82:
564:
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109:(the rest of the New Hebrides arc rotate west in front of the southward expanding
48:
The d'Entrecasteaux Ridge connects the New
Caledonia Ridge to the Vanuatu Trench
580:
Mortimer, N; Gans, PB; Palin, JM; Herzer, RH; Pelletier, B; Monzier, M (2014).
457:"The d'Entrecasteaux Zone-New Hebrides island arc collision zone: an overview"
226:
202:
97:
634:
621:
230:
210:
180:
600:
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356:, Sections:2.3 D'Entrecasteaux Ridge, 8.2 Eocene Subduction-Related Arcs
190:, is a more continuous ridge, mostly more similar in composition to the
173:
90:
221:
206:
137:
290:, The d'Entrecasteaux Zone and Surrounding Ocean Basins, pp. 22, 23
120:, explorer of the south-west Pacific in the late 18th century.
341:
299:
563:
Greene, HG; Collot, JY; Pelletier, B; Lallemand, S (1992).
569:
Proceedings of the Ocean
Drilling Program, Initial Reports
464:
Proceedings of the Ocean
Drilling Program, Initial Reports
233:
composition consistent with subduction related formation.
128:
The DER extends north from the New
Caledonia ridge to the
93:. It forms the northern extension of the New Caledonia–
485:"Collision tectonics in the New Hebrides arc (Vanuatu)"
394:
365:
353:
311:
275:
525:"Current tectonics of the Tonga–New Hebrides region"
16:
Double oceanic ridge in the south-west Pacific Ocean
263:
412:Collot, J. Y.; Daniel, J.; Burne, R. V. (1985).
390:
388:
386:
155:The southern ridge is composed of 40 to 36
523:Pelletier, B.; Calmant, S.; Pillet, R. (1998).
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8:
377:
337:
335:
287:
397:, Figure 2, 7.3 North D'Entrecasteaux Ridge
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253:
251:
194:, forms part of an abandoned, north-facing
85:in the south-west Pacific Ocean, north of
36:
322:
320:
156:
100:, and is now actively subducting in the
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216:A single dredged sample closest to the
133:
659:Underwater ridges of the Pacific Ocean
186:The northern ridge, also known as the
116:The name honours French naval officer
455:Collot, J. Y.; Fisher, M. A. (1992).
68:
7:
483:Meffre, S.; Crawford, A. J. (2001).
276:Pelletier, Calmant & Pillet 1998
198:which has been subducting under the
179:volcano, aged 40 ± 2 Ma, covered by
163:. Some have called it therefore the
529:Earth and Planetary Science Letters
266:, The d'Entrecasteaux Zone, pp. 5–7
14:
501:10.1046/j.1440-1738.2001.00292.x
22:
264:Collot, Daniel & Burne 1985
209:basalts that are primitive arc
183:to Miocene lagoonal limestone.
146:Central d'Entrecasteaux Basin
1:
549:10.1016/S0012-821X(98)00212-X
329:, Tectonic setting, pp. 34–35
140:flanked by two near-parallel
118:Antoine Bruni d'Entrecasteaux
441:10.1016/0040-1951(85)90185-4
188:North d'Entrecasteaux Ridge
165:South d'Entrecasteaux Chain
130:New Hebrides/Vanuatu Trench
675:
327:Meffre & Crawford 2001
378:Collot & Fisher 1992
288:Collot & Fisher 1992
541:1998E&PSL.164..263P
102:Vanuatu subduction zone
70:[dɑ̃tʁəkasto]
66:French pronunciation:
601:10.1002/2014TC003598
395:Mortimer et al. 2014
366:Mortimer et al. 2014
354:Mortimer et al. 2014
312:Mortimer et al. 2014
631: /
433:1985Tectp.112..325C
344:, Introduction, p43
218:New Caledonia Nappe
342:Greene et al. 1992
300:Greene et al. 1992
124:Geological setting
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192:Mariana fore-arc
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111:North Fiji Basin
107:Australian Plate
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302:, Figure 1, p44
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161:stratovolcanoes
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95:Loyalty Islands
91:Vanuatu Islands
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62:d'Entrecasteaux
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614:
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577:
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535:(1): 263–276.
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427:(1): 325–356.
421:Tectonophysics
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196:oceanic trench
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81:) is a double
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159:-old extinct
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87:New Caledonia
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83:oceanic ridge
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46:
39:
25:
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592:
588:
572:
568:
552:. Retrieved
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528:
512:. Retrieved
495:(1): 33–50.
492:
488:
472:. Retrieved
467:
463:
444:. Retrieved
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420:
373:
361:
349:
307:
295:
283:
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215:
200:New Hebrides
187:
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164:
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150:Santo Island
145:
127:
115:
89:and west of
78:
74:
61:
59:
638: /
635:16°S 165°E
489:Island Arc
380:, Abstract
368:, Abstract
314:, Figure 9
237:References
227:Quaternary
211:tholeiites
203:island arc
609:129008997
589:Tectonics
554:7 January
514:7 January
509:129497305
474:7 January
446:7 January
231:tholeiite
181:Oligocene
177:andesitic
653:Category
640:-16; 165
169:seamount
537:Bibcode
470:: 19–31
429:Bibcode
405:Sources
174:Miocene
607:
507:
222:E-MORB
207:Eocene
142:horsts
138:graben
626:165°E
605:S2CID
585:(PDF)
505:S2CID
460:(PDF)
417:(PDF)
242:Notes
75:Ridge
623:16°S
556:2017
516:2017
476:2017
448:2017
60:The
597:doi
573:134
545:doi
533:164
497:doi
468:134
437:doi
425:112
134:bsl
113:).
98:arc
79:DER
31:DER
655::
603:.
593:33
591:.
587:.
571:.
567:.
543:.
531:.
527:.
503:.
493:10
491:.
487:.
466:.
462:.
435:.
423:.
419:.
385:^
334:^
319:^
250:^
157:Ma
152:.
73:)
611:.
599::
575:.
558:.
547::
539::
518:.
499::
478:.
450:.
439::
431::
77:(
64:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
