District to mineral-scale geometry of the world-class Antino orogenic gold system, southeastern Suriname (Guiana shield)
Notice bibliographique
Résumé
• Multi-scale study of the Antino orogenic gold system. • Located within the Antino-Yaou-Benzdorp gold district (Eastern Suriname, Guiana Shield). • Both intrusion-hosted and shear zone-hosted orogenic gold. • Progressive ductile deformation locally overprinted by a polyphase brittle deformation stage. • Multiple gold events related to pyrite and pyrrhotite. The Antino-Yaou-Benzdorp gold district (Eastern Suriname), located within the Rhyacian-aged Marowijne Greenstone Belt of the Guiana Shield, hosts multiple gold deposits preferentially developed within intermediate intrusive bodies (intrusion-hosted orogenic gold) and at lithological boundaries (shear zone-hosted orogenic gold). A multi-scale approach, integrating district- to ore-mineral-scale observations is applied to assess the geometry and structural controls on gold mineralization. Within the district, the spatial distribution and orientation of gold camps, such as the Antino gold camp, are controlled by the TTG-complexes locations and shapes. These rigid bodies act as buttress for strain accumulation within the volcano-sedimentary sequence. At the deposit scale, zones of enhanced deformation are located at lithological contacts, along antiformal limbs, and along the edges of tonalitic intrusive bodies. These intrusions were preferential hosts for later brittle deformation and related brecciation/ veining. The first compressional stage D 1 , produced the ENE fabric, while the second stage, D 2a , was responsible for the main folding event during ongoing compression under NE-SW-oriented shortening, and the formation of axial planar fabric S 2a . NW-oriented dip-slip shear zones are related to the D 2b deformation stage and host both metric fault-fill veins and progressively deformed tension vein arrays. Locally, a refolding of the S 2b mylonitic foliation is observed (D 3 deformation-stage). This progressive ductile deformation is then locally overprinted by a polyphase brittle deformation (D 4 ) stage expressed by breccias, extensional veins and fractures. Strain axis orientations for shearing (NE-SW shortening) and refolding of mylonitic segments (NW-SE shortening) control the location of low-stress sites and, therefore, the location and orientation of gold ore shoots. At the mineral scale, micro X-ray fluorescence scanning on core samples reveals that early D 2b veins act as ground preparation sites for later (D 3 and D 4 -related) gold deposition, with boudin necks and folded mylonite hinges serving as low-stress zones for pyrrhotite and gold deposition. The D 4 -related brittle overprinting plays an important role in the total gold budget with remobilization and/or new gold inputs. Both shear zone-hosted, and tonalite intrusion-hosted systems demonstrate the importance of rheology in building an orogenic gold system. This study emphasizes the value of integrating multi-scale data for gold targeting, particularly through detailed vein analysis, which should be applied across the entire Guiana Shield.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,000 | 0,002 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,003 | 0,001 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; les deux têtes enseignantes s’accordent sur ce qui est montré ici.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».