Geology and hydrogeology of Carbonate Islands
| Autor: | Pascale Déjardin, Renaud Fichez, Francis Rougerie |
|---|---|
| Přispěvatelé: | Vacher, H.L. (ed.), Quinn, T. (ed.) |
| Jazyk: | angličtina |
| Rok vydání: | 1997 |
| Předmět: |
Biogeochemical cycle
geography SALINITE geography.geographical_feature_category GEOTHERMIE PH Atoll GEOMORPHOLOGIE UPWELLING MODELISATION Diagenesis RECIF BARRIERE Oceanography HYDROGEOLOGIE Archipelago Meteoric water COURANT MARIN PHOSPHATE CARBONATE ATOLL Reef Geothermal gradient Geology DIAGENESE South Pacific Gyre |
| Popis: | The large geomorphological diversity of the Polynesian barrier and atoll reefs can be accommodated by a single heuristic model that is called as geothermal endo-upwelling. The model is based on the circulation of interstitial water driven by thermal convection and modulated at the reef surface by oceanic wave surge and by the circulation of recharge-driven meteoric water. The geothermal endo-upwelling model, which can be viewed as a form of low-energy hydrothermalism, impacts on a diversity of biogeochemical processes including (1) the productivity, calcification and cementation processes active in algal-coral reef ecosystems, (2) carbonate and phosphate diagenesis, and (3) degradation of organic matter. Barrier reefs and atolls of French Polynesia are surrounded by warm and clear oligotrophic water of the South Pacific gyre. Atolls forming the Tuamotu Archipelago show great geomorphologic and hydrologic diversity. Reef-lagoon systems of other archipelagoes (Society Islands, Austral Islands) are similarly diverse. In all these cases, however, barrier reefs maintain a set of uniform morphological features and must be viewed as the first-order structure. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|