District to mineral-scale geometry of the world-class Antino orogenic gold system, southeastern Suriname (Guiana shield)
Bibliographic record
Abstract
• 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.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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; both teacher heads agree on what is shown here.
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".