Observatoire de l'environnement Nouvelle Calédonie

Il y a environ 2309 résultats pour les termes de recherche: ~riviere OR creek OR eau douce

Affichage des résultats: 1081 à 1090

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Nickel and iron partitioning between clay minerals, Fe-oxides and Fe-sulfides in lagoon sediments from New Caledonia

In the tropics, continental weathering and erosion are major sources of trace metals towards estuaries and lagoons, where early diagenesis of sediments may influence their mobility and bioavailability. Determining trace metals speciation in tropical ...

Carbonation and silicification of the New Caledonia peridotite Nappe: a stable isotope survey

The ophiolite of New Caledonia (Southwest Pacific), known as the Peridotite Nappe, has been subject to tropical weathering since its emersion during the Oligocene. Silica veins at the base of the weathering profile and magnesite veins along the serpe...

Slab-derived origin of tremolite-antigorite veins in a supra-subduction ophiolite; the Peridotite Nappe (New Caledonia) as a case study.

Hydration of mantle peridotites provides information on the exhumation history and on the fluid regime accompanying exhumation of these rocks (reservoirs involved, fluid/rock ratios, temperature of interaction). Highly depleted harzburgites and dunit...

Fracture controlled permeability of ultramafic basement aquifers. Inferences from the Koniambo massif, New Caledonia

We study the relationship between fracture distribution and permeability in weathered peridotites exposed to tropical climate using the data from the Koniambo massif (New Caledonia, South Pacific). The vertical distribution of hydraulic conductivity ...

Regional forcing explains local species diversity and turnover on tropical islands

Aim: To determine the role of regional forcing on plot-level species diversity and composition, and to quantify the relative importance of biogeographical and climatic factors in explaining woody plant diversity and composition at the local-, island-...

A conceptual hydrogeological model of ophiolite hard-rock aquifers in Oman based on a multiscale and a multidisciplinary approach

Ophiolites are found all over the world: from the Alps to the Himalayas, in Cuba, Papua-New Guinea, New Caledonia, Newfoundland, etc. They are composed of hard rocks—basalt, dolerite, gabbro and peridotite, which are formed at the mid-oceanic ridge...

Carbonation and silicification of the New Caledonia peridotite Nappe: a stable isotope survey

The ophiolite of New Caledonia (Southwest Pacific), known as the Peridotite Nappe, has been subject to tropical weathering since its emersion during the Oligocene. Silica veins at the base of the weathering profile and magnesite veins along the serpe...

Slab-derived origin of tremolite-antigorite veins in a supra-subduction ophiolite; the Peridotite Nappe (New Caledonia) as a case study.

Hydration of mantle peridotites provides information on the exhumation history and on the fluid regime accompanying exhumation of these rocks (reservoirs involved, fluid/rock ratios, temperature of interaction). Highly depleted harzburgites and dunit...

Post-obduction carbonate system development in New Caledonia (Népoui, Lower Miocene)

For the first time, depositional models of Lower Miocene carbonate systems from New Caledonia (Southwest Pacific) are proposed, on the basis of a sedimentological and paleoenvironmental study of both cores and outcrops. In the Népoui area, two dis...

Late paleozoic pre and syn-kinematic plutons of the Kangguer-Huangshan shear zone : inference on the tectonic evolution of the eastern Chinese North T...

Permian large-scale transcurrent tectonics and massive magmatism are prominent features of the Tianshan belt and neighboring regions of the Central Asian Orogenic Belt. Structural, geochronological and geochemical analyses of Carboniferous and Permia...