January 1973
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23 Reads
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54 Citations
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January 1973
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23 Reads
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54 Citations
January 1972
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2 Reads
January 1971
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3 Reads
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9 Citations
January 1971
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7 Reads
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16 Citations
January 1971
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14 Reads
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8 Citations
January 1969
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3 Reads
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1 Citation
January 1969
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7 Reads
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1 Citation
January 1969
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7 Reads
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12 Citations
Bulletin du Service de la carte géologique d Alsace et de Lorraine
Les eaux drainant les péridotites de Nouvelle-Calédonie sont bicarbonatées, magnésiennes et siliceuses. La libération de magnésium est peu influencée par l'intensité du drainage, contrairement à celle de la silice. Le calcul de l'échelle de la mobilité relative des éléments donne : Na > Ca > Sr > k > Cu > Mg ≧ Si > Al > V > Ni > Mn ≧ Ti ≧ Go > Cr ≧ Fe Na > Ca > Sr > k> Си > Si ≧ Mg > Al > V > Ni > Mn ≧ Ti ≧ Co > Cr ≧ Fe Cette séquence correspond à une Chromatographie des ions à travers le paysage. Les eaux traduisent la dynamique des types d'altération : la ferrallitisation intervient seulement aux périodes humides et sur les pentes faibles. Le climat subtropical de la Nouvelle-Calédonie provoque donc, sur les péridotites, l'alternance des phases de ferrallitisation et de simatisation, ce qui entraîne l'accumulation des silicates de nickel (garniérite).
January 1969
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20 Reads
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17 Citations
January 1968
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4 Reads
... This part of Grande Terre is characterized by a peculiar geology with ultramafic rocks made of peridotite (e.g., Paris 1981, Maurizot & Vendé-Leclerc 2009. The running waters on that soil type are very poor in nutrients and their calcium-magnesium ratio is extremely low due to a high magnesium concentration (Weninger 1968, Trescases 1969. To implement a diatom index to assess the biological quality of the running waters, new sampling campaigns were carried out in 2012 and 2013. ...
January 1969
Bulletin du Service de la carte géologique d Alsace et de Lorraine
... These serpentinite areas around the mass of peridotite are located at lower altitudes. Two primary soil types have developed on UM rocks in New Caledonia (Trescases, 1969;Trescases, 1973). Ferralsols are the most extensive and derived from peridotites. ...
January 1969
... The major rivers of the south-western part of New Caledonia are characterized by an upper course with abrupt relief and a lower course made up of piedmont deposits and bedrock weathering material. Due to the torrential regime, sediment supply is very low in the absence of rainfall because of the low flow energy (Baltzer and Trescases, 1971b;Dugas and Debenay, 1982). On the contrary, as rainfall can reach up to 700 mm in 24 h, the induced intense weathering results in extremely high quantities of suspended matter. ...
January 1971
... Ces aspects sont détaillés en § I-B.1. Baltzer and Trescases, 1971) ...
January 1971
... According to detailed petrographic examinations, although primary hematite in the samples is replaced by supergene goethite formed by the secondary oxidation events after their formation, they are still present as massive hematite with transitions to chalcedony or quartz, coprecipitated (deposited together) due to silicification events coeval with lateritization. As also documented by Trescases (1973), the presence of quartz and/or chalcedony co-precipitated with the primary hematite suggests that a portion of the silica in the silicates in the ultramafic rocks was dissolved and re-precipitated, and preserved alongside of the primary hematite in the alteration zone during lateritization in Çaldag region. ...
January 1973
... Although the Norfolk Ridge has not been studied well, Shor et al. (1971) interpreted a crustal thickness of about 22 km and concluded that it probably was continental. Dubois et al. (1973) reported a crustal thickness of 20 to 25 km. New Caledonia is considered to be, in part, continental with a crustal thickness of up to 35-39 km under the central mountain chain (Dubois et al., 1973). ...
January 1971