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| Registros recuperados: 18 | |
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| Klingelhoefer, Frauke; Lafoy, Y; Collot, Julien; Cosquer, Emmanuel; Geli, Louis; Nouze, Herve; Vially, R. |
| [1] During the Zoneco 11 marine geophysical survey (September 2004), two deep reflection seismic profiles recorded by ocean bottom seismometers were acquired in the offshore domain west of New Caledonia. The northern profile crosses the New Caledonia Basin, the Fairway Ridge, the Fairway Basin, and the Lord Howe Rise. The southern profile crosses the Norfolk Rise south of New Caledonia, the New Caledonia Basin, the Fairway Ridge and Basin, and ends at the foot of Lord Howe Rise. On the northern profile the Lord Howe Rise has a crustal thickness of 23 km and exhibits seismic velocities and velocity gradients characteristic of continental crust. The crust thins to 12-15 km in the neighboring Fairway Basin, which is interpreted to be of thinned continental... |
| Tipo: Text |
Palavras-chave: Crustal structure; SW Pacific; Wide angle seismic. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3543.pdf |
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| Patriat, Martin; Collot, Julien; Danyushevsky, L.; Fabre, M.; Meffre, S.; Falloon, T.; Rouillard, P.; Pelletier, B.; Roach, M.; Fournier, M.. |
| New geophysical data acquired during three expeditions of the R/V Southern Surveyor in the southern part of the North Fiji Basin allow us to characterize the deformation of the upper plate at the southern termination of the New Hebrides subduction zone, where it bends eastward along the Hunter Ridge. Unlike the northern end of the Tonga subduction zone, on the other side of the North Fiji Basin, the 90° bend does not correspond to the transition from a subduction zone to a transform fault, but it is due to the progressive retreat of the New Hebrides trench. The subduction trench retreat is accommodated in the upper plate by the migration toward the southwest of the New Hebrides arc and toward the south of the Hunter Ridge, so that the direction of... |
| Tipo: Text |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00280/39110/37663.pdf |
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| Patriat, Martin; Falloon, Trevor; Danyushevsky, Leonid; Collot, Julien; Jean, Marlon M.; Hoernle, Kaj; Hauff, Folkmar; Maas, Roland; Woodhead, Jon D.; Feig, Sandrin T.. |
| The development of ideas leading to a greater understanding of subduction initiation is limited by the scarcity of present-day examples. Furthermore, the few examples identified so far unfortunately provide few insights into the nature of magmatism at the inception of subduction. Here we report new observations from the Matthew and Hunter (M&H) subduction zone, a very young subduction zone located in the South-West Pacific. Tectonics of the area show it is younger than 2 Ma, making the M&H the youngest known volcanically-active subduction system and hence providing unique insights into the earliest stages of subduction initiation. Volcanism in this area comprises an exceptionally diverse range of contemporaneously erupting magma compositions which... |
| Tipo: Text |
Palavras-chave: Subduction zone; Subduction initiation; Forearc; Ophiolites; Boninites; Adakites. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00473/58422/61077.pdf |
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| Collot, Julien; Lewis, Keith; Lamarche, Geoffroy; Lallemand, Serge. |
| Despite convergent margins being unstable systems, most reports of huge submarine slope failure have come from oceanic volcanoes and passive margins. Swath bathymetry and seismic profiles of the northern Hikurangi subduction system, New Zealand, show a tapering 65–30 km wide by 65 km deep margin indentation, with a giant, 3150±630 km3, blocky, debris avalanche deposit projecting 40 km out across horizontal trench fill, and a debris flow deposit projecting over 100 km. Slide blocks are well‐bedded, up to 18 km across and 1.2 km high, the largest being at the avalanche deposit's leading edge. Samples dredged from them are mainly Miocene shelf calc‐mudstones similar to those outcropping around the indentation. Cores from cover beds suggest that failure... |
| Tipo: Text |
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| Ano: 2001 |
URL: https://archimer.ifremer.fr/doc/00683/79509/82127.pdf |
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| Collot, Julien; Vendé-leclerc, Myriam; Rouillard, Pierrick; Lafoy, Yves; Géli, Louis. |
| The southwestern Pacific Ocean region hosts submerged continental margins, ridges, sedimentary basins, and volcanic arcs located around Papua New Guinea, New Zealand, Australia, and Fiji. The geological history of this vast region has remained controversial, and to improve understanding of the processes that controlled its geodynamical evolution, it is essential to place each piece of available data in a regional spatiotemporal framework. To this end, a new map, entitled “Structural Provinces of the Southwest Pacific,” was released by the Geological Survey of New Caledonia in May 2011. The publication consists of two parts: (1) a 40-page booklet of geological notes, which documents the nature and age of each structure and contains an associated list of... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00297/40776/39785.pdf |
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| Collot, Julien; Patriat, Martin; Rouillard, Pierrick; Samadi, Sarah; Gardes, Lionel; Pelletier, Bernard; Loubersac, Lionel. |
| This article of the number 10 of Tai Kona is the natural complement to the article appeared under the number 8, dedicated to the submarine geodiversity of the New Caledonian EEZ. The first article notably put the bases of knowledge on the history, the origins and the specificities of the geodiversity of the maritime spaces of the New Caledonian EEZ. The present article focuses on four of the major stakes which are put: 1/ the scientific ones relative to an exceptional submarine geologic context, 2 /the economic ones connected to such a favorable geologic context and to mineral resources exploitation perspectives which are no more domain of the utopia, 3/ the major environmental ones with the existence of a semi deep and deep major biodiversity and 4/ the... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00209/32013/30443.pdf |
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| Nouze, Herve; Cosquer, Emmanuel; Collot, Julien; Foucher, Jean-paul; Klingelhoefer, Frauke; Lafoy, Yves; Geli, Louis. |
| High-resolution reflection and refraction seismic data were collected in 2004 to investigate, in further detail than allowed by pre-existing low resolution seismic data, the nature of a Bottom Simulating Reflector (BSR) that extends over a broad area of the Fairway Basin, a rifted, continental structure located on the eastern flank of the Lord Howe Rise, to the southwest of New Caledonia. Two main reflectors are documented: the shallower (RN) mimics the seafloor and has a negative polarity while the deeper (RP) does not always mimic the seafloor and has a positive polarity. Using the existing regional seismic lines, we can show that reflector RN can be continuously followed up to DSDP 208 drill hole site. Reflector RP is discontinuous and cannot be traced... |
| Tipo: Text |
Palavras-chave: Stratigraphy; Gas hydrates; Geophysics; Southwest Pacific; Fairway Basin; BSR. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-7321.pdf |
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| Collot, Julien; Patriat, Martin; Etienne, S.; Rouillard, P.; Soetaert, F.; Juan, C.; Marcaillou, B.; Palazzin, G.; Clerc, C.; Maurizot, P.; Pattier, F; Tournadour, E.; Sevin, B.; Privat, A.. |
| Classically, deepwater fold-and-thrust belts are classified in two main types, depending if they result from near- or far-field stresses and the understanding of their driving and triggering mechanism is poorly known. We present a geophysical dataset off the western margin of New Caledonia (SW Pacific) that reveals deformed structures of a deepwater fold-and-thrust belt that we interpret as a near-field gravity-driven system, which is not located at a rifted passive margin. The main factor triggering deformation is inferred to be oversteepening of the margin slope by post-obduction isostatic rebound. Onshore erosion of abnormally-dense obducted material, combined with sediment loading in the adjacent basin, has induced vertical motions that have caused... |
| Tipo: Text |
Palavras-chave: Deepwater fold-and-thrust belt; Obduction; Isostasy. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00405/51614/52162.pdf |
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| Collot, Julien; Patriat, Martin; Rouillard, Pierrick; Pelletier, Bernard; Loubersac, Lionel. |
| The object of this article is to offer a synthesis of the knowledge clarifying the originality and the diversity of the submarine geological formations of the New Caledonian EEZ. A reminder is given onto the geologic history of the region, based upon the dislocation of the Gondwana Continent, the opening of the Tasman Sea, the presence of submarine volcanism, the setting up of heavy peridotitic rocks, the building up of the Fairway and Lord Howe Ridges and of sedimentary basins, the formation of volcanic domes and sea-mounts or guyots, the subduction along the Vanuatu Trench, the uplift of the Loyalty Islands, the development of carbonated ptatforms around the islands etc.... Of this complex history ensues an exceptional submarine geo-diversity. After this... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00194/30574/29098.pdf |
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| Mortimer, Nick; Campbell, Hamish J.; Tulloch, Andy J.; King, Peter R.; Stagpoole, Vaughan M.; Wood, Ray A.; Rattenbury, Mark S.; Sutherland, Rupert; Adams, Chris J.; Collot, Julien; Seton, Maria. |
| A 4.9 Mkm2 region of the southwest Pacific Ocean is made up of continental crust. The region has elevated bathymetry relative to surrounding oceanic crust, diverse and silica-rich rocks, and relatively thick and low-velocity crustal structure. Its isolation from Australia and large area support its definition as a continent— Zealandia. Zealandia was formerly part of Gondwana. Today it is 94% submerged, mainly as a result of widespread Late Cretaceous crustal thinning preceding supercontinent breakup and consequent isostatic balance. The identification of Zealandia as a geological continent, rather than a collection of continental islands, fragments, and slices, more correctly represents the geology of this part of Earth. Zealandia provides a fresh context... |
| Tipo: Text |
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| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00489/60035/63303.pdf |
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| Patriat, Martin; Collot, Julien; Etienne, Samuel; Poli, Sara; Clerc, Camille; Mortimer, Nick; Pattier, France; Juan, Caroline; Roest, Walter. |
| One of the largest ophiolitic peridotite masses in the world covers a quarter of the island of Grande Terre, New Caledonia. The Peridotite Nappe was obducted during the Eocene, is weakly deformed and corresponds to the highest of a structurally simple pile of thrust nappes. We present new marine seismic data that allows us to track the offshore continuation of the Peridotite Nappe along‐strike for a distance of more than 500 km south of New Caledonia, and to image its pre‐, syn‐ and post‐obduction sedimentary records. Offshore, the Peridotite Nappe underlies a c. 150‐km wide and 2 km‐deep basin. Flat‐topped horsts of peridotite are clearly bounded by major normal faults; in contrast faults are obscure onland. To the east, the Peridotite Nappe roots along... |
| Tipo: Text |
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| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00431/54242/55568.pdf |
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| Collot, Julien; Geli, Louis; Lafoy, Y; Vially, R; Cluzel, D; Klingelhoefer, Frauke; Nouze, Herve. |
| New, high-quality multichannel seismic reflection data from the western New Caledonia offshore domain allow for the first time the direct, continuous connection of seismic reflectors between the Deep Sea Drilling Project 208 drill hole on the Lord Howe Rise and the New Caledonia Basin. A novel seismic interpretation is hence proposed for the northern New Caledonia Basin stratigraphy, which places the Eocene/Oligocene unconformity deeper than previously thought and revisits the actual thickness of the pre-Oligocene sequences. A causal link is proposed between the obduction of the South Loyalty Basin over New Caledonia (NC) and the tectonic history of the northern New Caledonia Basin. Here it is suggested that as the South Loyalty Basin was being obducted... |
| Tipo: Text |
Palavras-chave: New Caledonia; Seismics; Obduction. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4782.pdf |
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| Collot, Julien; Patriat, Martin; Sutherland, R.; Williams, S.; Cluzel, D.; Seton, M.; Pelletier, B.; Roest, Walter; Etienne, S.; Bordenave, A.; Maurizot, P.. |
| The SW Pacific region consists of a succession of ridges and basins that were created by the fragmentation of Gondwana and the evolution of subduction zones since Mesozoic times. This complex geodynamic evolution shaped the geology of New Caledonia, which lies in the northern part of the Zealandia continent. Alternative tectonic models have been postulated. Most models agree that New Caledonia was situated on an active plate margin of eastern Gondwana during the Mesozoic. Extension affected the region from the Late Cretaceous to the Paleocene and models for this period vary in the location and nature of the plate boundary between the Pacific and Australian plates. Eocene regional tectonic contraction included the obduction of a mantle-derived Peridotite... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00643/75543/76565.pdf |
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| Sutherland, Rupert; Collot, Julien; Lafoy, Yves; Logan, Graham A.; Hackney, Ron; Stagpoole, Vaughan; Uruski, Chris; Hashimoto, Takehiko; Higgins, Karen; Herzer, Richard H.; Wood, Ray; Mortimer, Nick; Rollet, Nadege. |
| We use seismic reflection and rock sample data to propose that the first-order physiography of New Caledonia Trough and Norfolk Ridge formed in Eocene and Oligocene time and was associated with the onset of subduction and back-arc spreading at the Australia-Pacific plate boundary. Our tectonic model involves an initial Cretaceous rift that is strongly modified by Cenozoic subduction initiation. Hence, we are able to explain (1) complex sedimentary basins of inferred Mesozoic age; (2) a prominent unconformity and onlap surface of middle Eocene to early Miocene age at the base of flat-lying sediments beneath the axis of New Caledonia Trough; (3) gently dipping, variable thickness, and locally deformed Late Cretaceous strata along the margins of the trough;... |
| Tipo: Text |
Palavras-chave: Norfolk ridge system; Back arc extension; New zealand region; South fiji basin; Sw pacific; Northland plateau; Tasman sea; Seismic stratigraphy; Geodynamic ecolution; Tectonic evolution. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00001/11271/9283.pdf |
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| Collot, Julien; Migeon, Sebastien; Spence, G.; Legonidec, Y.; Marcaillou, B.; Schneider, J.-l.; Michaud, F.; Alvarado, A.; Lebrun, J.-f.; Sosson, M.; Pazmino, A.. |
| cuador and southwest (SW) Colombia suffered widespread damage during the twentieth century as a result of some of the greatest subduction earthquakes and associated tsunamis ever recorded. In 1906, the Ecuador‐SW Columbia margin, located at the transition between the continent and deep ocean, ruptured over a 500‐kilometer length as a single great (Mw = 8.8) subduction earthquake (Figure 1a) [Kelleher, 1972]. The 1906 rupture zone was partially reactivated in 1942, 1958, and 1979 by earthquakes of Mw 7.7 to 8.2 (Figure 1b), with 100‐200 kilometerlong rupture zones [Beck and Ruff, 1984]. Such considerable variation in earthquake rupture length and magnitude in this area's seismic cycles during the last century has raised questions about the nature and... |
| Tipo: Text |
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| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/00451/56257/57826.pdf |
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| Etienne, S.; Collot, Julien; Sutherland, R.; Patriat, Martin; Bache, Francois; Rouillard, P.; Henrys, S.; Barker, D.; Juan, C.. |
| The New Caledonia Trough (NCT) is a 2000–3000 m deep bathymetric feature that extends 2500 km from Taranaki, New Zealand, to the western margin of New Caledonia (Northern Zealandia, SW Pacific). The underlying sedimentary basin originates from Cretaceous extension, but underwent a significant Eocene tectonic event that shaped its present physiography. We present an analysis of the basin based on multibeam data, seismic profiles and rock samples collected on the TAN1312 and TAN1409 Expeditions onboard R/V Tangaroa, combined with legacy data. We focus on the southern part of the basin, where new data reveal a link between compressive deformation of Paleocene strata and their potential reworking into the basin. On the western basin side, Upper Cretaceous to... |
| Tipo: Text |
Palavras-chave: Zealandia; New Caledonia Trough; Deepwater basin; Syn-tectonic deposition; Submarine canyon; Sediment waves. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00414/52550/53377.pdf |
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| Collot, Julien; Herzer, R.; Lafoy, Y.; Geli, Louis. |
| The Fairway Ridge is a buried continental structure that separates the Fairway Basin from the New Caledonia Basin. The proposed Cretaceous age of the Fairway Basin has remained highly hypothetical to date. Deep offshore petroleum exploration wells revealed well-dated Mesozoic carbonaceous sedimentary rocks in the Taranaki Basin at the southern end of the Aotea Basin. In this paper we use geophysical data to confirm the continuity of the 2000 km long Fairway-Aotea Basin connecting New Caledonia to New Zealand and prove its early Late Cretaceous age. Analysis of seismic reflection profiles together with newly compiled gravity and magnetic maps reveals Late Cretaceous NESW trending lineaments projecting northeastward from major Tasman Sea fracture zones and... |
| Tipo: Text |
Palavras-chave: Aotea Basin; Fairway Basin; Southwest Pacific. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-7322.pdf |
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| Registros recuperados: 18 | |
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