Observatoire de l'environnement Nouvelle Calédonie

Il y a environ 2304 résultats pour les termes de recherche: ~riviere OR creek OR eau douce

Affichage des résultats: 961 à 970

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Garnierite characterisation for open data bases for nickel laterite exploration

The nickel laterite mining industry faces lower recovery rates related to low ore grades, multiple nickel carrying minerals, as well as lateral and vertical heterogeneities at ore deposit scale. Garnierite, a complex mixture of nickel-bearing phyllos...

Deepwater fold-and-thrust belt along New Caledonia's western margin: relation to post-obduction vertical motions

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...

Geometry and deformation of the sole of a large obducted ophiolitic unit: insights from surface geology and airborne electromagnetics – Peridotite N...

To clarify the serpentinite correlation and kinematics in New Caledonia, we focus on the northwestern boundary of the Massif du Sud and the Mont Do Massif, in the Boulouparis area. On the basis of airborne electromagnetics data, structural analysis, ...

Eocene pre- and syn-obduction tectonics in New Caledonia (Southwest Pacific), a case for oblique subduction, transcurrent tectonics and oroclinal bend...

The structural analysis of the metamorphic belt and allochthonous terranes, which represent the lower and upper plates of the Eocene subduction/obduction complex of New Caledonia respectively, unravels a multi-step evolution. At subduction inception,...

Post-obduction dismantling of the early regolith and related conglomerates in the Kopeto-Boulinda-Nepoui area (New Caledonia): a possible Lower Miocen...

In New Caledonia post obduction uplift caused the erosion of the early regolith, but their timing is poorly constrained. The Nepoui Formation, on the west coast, is a witness of post-obduction deposits. This area presents stepped ferruginized surface...

Can we use the planation surface concept to reconstruct the morphogenesis of New Caledonia,? First low temperature thermochronological data

Nickel ore deposits of New Caledonia are formed in thick laterites and ferricretes developed on peridotites. Formation of this regolith remains unclear but combines stable phases with weathering profile development and preservation and mobile phases ...

Garnierite characterization for open mineral databases

The nickel laterite mining industry faces lower recovery rates related to low ore grades, multiple nickel carrying minerals, as well as lateral and vertical heterogeneities at ore deposit scale. Garnierite, a complex mixture of nickel-bearing phyllos...

The metamorphic sole of New Caledonia ophiolite: Ar-40/Ar-39, U-Pb, and geochemical evidence for subduction inception at a spreading ridge

Amphibolite lenses that locally crop out below the serpentinite sole at the base of the ophiolite of New Caledonia (termed Peridotite Nappe) recrystallized in the high-temperature amphibolite facies and thus sharply contrast with blueschists and eclo...

Lagoonal islets as indicator of recent environmental changes – The caledonian example

Sandy islets (" Caye ") of New Caledonia have a major role in the lagoonal ecosystems and a high importance in the Caledonian culture and way of life. One of the recurrent issues for people and governmental agencies concerns the islets's future in th...

Annexe 6 - Rapport annuel 2018 concernant l’activité minière - Centre minier de Goro - Incidence des activités minières sur l’occupation des s...

Le présent document constitue l'annexe 06 du [Rapport annuel 2018 concernant l'activité minière - Centre minier de Goro - Incidence des activités minières sur l'occupation des sols, l'environnement et les eaux superficielles et souterraines](/cd...