Etude géochronologique, aspects géomorphologiques et géochimiques du volcanisme de l'île de Basse Terre (Guadeloupe), et datation des structures d'effondrement de flanc majeures de l'Arc des Petites Antilles
Bibliographic record
Abstract
The use of the K-Ar Cassignol-Gillot technique enabled us to define the temporal bounds of the sub-aerial effusive volcanism in Basse-Terre (Guadeloupe), and to constrain the active periods of the four main massifs that make the island, which were poorly defined so far. The Basal Complex [2.79 ± 0.04 – 2.68 ± 0.04 Ma], the Septentrional Chain [1.81 ± 0.03 – 1.15 ± 0.02 Ma], the Axial Chain [1023 ± 25 - 435 ± 8 ka] and the most recent volcanic complex of Grande-Découverte [205 ± 28 - actuel] illustrate the southwards migration of volcanism through time in Basse-Terre since 3 Ma, along a main N-S direction, at a rate of roughly 20 km/Ma. We propose magma extraction to be linked to the E-W striking graben and en-échelon normal fault systems that affect the Guadeloupe archipelago. Extrusion rates, on the basis of morphological observations and modeling spread from 1.4 10-5 (Basal Complex) to 4.5 10-4 km3/yr (Axial Chain). The main building stages of the most recent complex in Basse-Terre have been determined. The Trois Rivières – Madeleine Complex, located South of the Grande-Découverte Volcano has been constrained between 87 ± 5 ka and present time. For the first time K-Ar ages are provided for this area. These show that the various stages of effusive activity are contemporaneous with the Grande-Découverte volcano ones. The Trois-Rivières lava flows (87 ± 5 ka) and the subsequent emplacement of the E-W alignment of La Madeleine dome and Le Palmiste lava flow, between 70 and 45 ka, constrain the age of a Marie-Galante rift propagation phase. Recognition and dating of lava flows younger than 10 ka in the surroundings of the La Madeleine dome lead to extend the present time volcanic activity up to the extreme south of the island, hence to consider volcanic hazards in a larger zone spreading from La Soufrière area up to the La Madeleine -Trois Rivières volcanic complex. Finally, dating of major flank-collapse events in Basse-Terre (640 and 550 ka), Dominica (100 ka), Martinique (330 ka) and St. Lucia (100 ka) have been realized and we propose in this work a causal link between the recurrence of such catastrophic events and global climate changes.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.008 | 0.005 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".