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Orogenic gold mineralisation in the Archean North Atlantic craton, southern West and South-West Greenland Jochen Kolb 1, Denis M. Schlatter 1, Annika Dziggel.

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Presentation on theme: "Orogenic gold mineralisation in the Archean North Atlantic craton, southern West and South-West Greenland Jochen Kolb 1, Denis M. Schlatter 1, Annika Dziggel."— Presentation transcript:

1 Orogenic gold mineralisation in the Archean North Atlantic craton, southern West and South-West Greenland Jochen Kolb 1, Denis M. Schlatter 1, Annika Dziggel 2, Alexander F.M. Kisters 3 ¹Department of Petrology and Economic Geology, Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark 2 Institute of Mineralogy and Economic Geology, RWTH Aachen University, Wüllnerstr. 2, Aachen, Germany 3 Department of Earth Sciences, Stellenbosch University, Matieland 7602, South Africa

2 Mineralizing system of orogenic gold deposits Groves et al Main devolatilization 440 – 520°C Philipps and Powell 2010 Ridley et al. 1996

3 Gold production vs. gold ages Goldfarb et al North Atlantic craton

4 Schematic geologocal map of Greenland

5 Geological map of South-West Greenland Paamiut gold province Tartoq gold province

6 Characteristics of gold mineralization Paamiut gold province 5 occurrences; 40 km strike Auriferous quartz veins in higher-order structures Au-only + As, W, Mo, Bi Ore mineralogy: Po-Apy- Ccp Hydrothermal alteration mineralogy – Proximal Hbl – Distal Qtz-Hbl/Oam-Bt- Tur-Ank ± Grt, Ms, Cal – Sulfide-poor (< 5 vol.%) Tartoq gold province 3 occurrences; 40 km strike Auriferous quartz veins in higher-order structures Au-only + As, Ag, W, Sb, Bi Ore mineralogy: Apy-Ccp- Py Hydrothermal alteration mineralogy – Qtz-Ms-Chl-Ank – Sulfide-poor (< 5 vol.%); except BIF

7 The Paamiut gold province: structure Metamorphic dates – 2850 – 2830 Ma: Paamiut orogeny – 2760 – 2740 Ma: Tasiusarsuaq orogeny

8 The Tartoq gold province: structure ±Au Au ±Au Metamorphic dates – 2850 – 2830 Ma: Paamiut orogeny – 2760 – 2740 Ma: Tasiusarsuaq orogeny

9 Geological map of southern West Greenland Bjørnesund occurrence Ca Ma Sermilik prospect

10 Characteristics of gold mineralization Sermilik gold prospect 2 locations; 4 km strike Ca Ma Auriferous quartz veins in folds and shear zones Gold-only + Ag, As Ore mineralogy: Po-Ccp-Py- Ilm-Mag Hydrothermal alteration mineralogy – Qtz-Grt-Bt-Kfs (660°C, kbar) – Sulfide-poor (< 5 vol.%)

11 Tectonic model for the Sermilik prospect: Tasiusarsuaq orogeny NS

12 Geological map of southern West Greenland

13 Characteristics of gold mineralization Godthåbsfjord gold province 5 prospects; 110 km strike 2985 Ma, 2715 Ma, 2630 Ma Gold-quartz±carbonate veins Ore mineralogy: Po-Ccp- Apy-Py-Ilm-Mag Hydrothermal alteration mineralogy – Inner Qtz-Hbl ± Bt – Proximal Qtz-Grt-Bt-Hbl-Sil ( °C, 4-6 kbar) – Distal Bt ± Grt – Sulfide-poor (< 5 vol.%) Tasiusarsuaq gold province 7 locations; terrane- scale Ca Ma Quartz veins ± Au Ore mineralogy: Po-Ccp- Py-Ilm-Mag Hydrothermal alteration mineralogy – Inner Qtz-Hbl ± Bt, Ep, Rt – Proximal Qtz-Grt-Bt-Hbl ± Ms (650°C, kbar) – Distal Bt ± Grt – Sulfide-poor (< 5 vol.%)

14 Structure of the Godthåbsfjord and Tasiusarsuaq gold provinces

15 Model for Ma orogenic gold

16 Conclusions Several stages of orogenic gold mineralization ca Ma Isukasia orogeny 2850 – 2830 Ma Paamiut orogeny 2800 – 2740 Ma Tasiusarsuaq orogeny 2720 – 2700 Ma Tre Brødre orogeny 2670 – 2580 Ma Kapisilik orogeny Hypozonal orogenic gold – Tasiusarsuaq gold province: single-stage – no potential – Godthåbsfjord gold province: multi-stage (?) – small deposits Mesozonal orogenic gold – Paamiut gold province – not explored, good potential – Tartoq gold province – not explored, good potential


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