Combining exploration and multivariate techniques to detect the Bjørnesund West gold occurrence, southern West Greenland

Schlatter, Denis; Stensgaard, Bo Møller

doi:10.34194/geusb.v31.4663

Cited by 5 publications

(4 citation statements)

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“…However, it has been possible to identify several new gold occurrences in the Tasiusarsuaq gold province, using a combination of 1:20,000 scale field maps from the GEUS archives and aeromagnetic, radiometric and stream-sediment geochemical data and fieldwork (Kolb et al, 2013a). Recent predictive gold potential modelling using geological, geochemical and geophysical data identified not only the known occurrences, but also a few new interesting gold targets (Schlatter and Stensgaard, 2014;Stensgaard, 2013;).…”

Section: Geological Geochemical and Geophysical Exploration Signaturesmentioning

confidence: 99%

Metallogeny of the North Atlantic Craton in Greenland

2015

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The North Atlantic Craton (NAC) extends along the coasts of southern Greenland. At its northern and southern margins, Archaean rocks are overprinted by Palaeoproterozoic orogeny or overlain by younger rocks. Typical granite-greenstone and granite-gneiss complexes represent the entire Archaean, with a hiatus from ∼3.55–3.20 Ga. In the granulite- and amphibolite-facies terranes, the metallogeny comprises hypozonal orogenic gold and Ni-PGE-Cr-Ti-V in mafic-ultramafic magmatic systems. Gold occurrences are widespread around and south of the capital, Nuuk. Nickel mineralization in the Maniitsoq Ni project is hosted in the Norite belt; Cr and PGE in Qeqertarssuatsiaq, and Ti-V in Sinarsuk in the Fiskenæsset complex. The lower-grade metamorphic Isua greenstone belt hosts the >1000 Mt Isua iron deposit in an Eoarchaean banded iron formation. Major Neoarchaean shear zones host mesozonal orogenic gold mineralization over considerable strike length in South-West Greenland. The current metallogenic model of the NAC is based on low-resolution data and variable geological understanding, and prospecting has been the main exploration method. In order to generate a robust understanding of the metal endowment, it is necessary to apply an integrated and collective approach. The NAC is similar to other well-endowed Archaean terranes but is underexplored, and is therefore likely to host numerous targets for greenfields exploration.

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Section: Geological Geochemical and Geophysical Exploration Signaturesmentioning

confidence: 99%

Metallogeny of the North Atlantic Craton in Greenland

2015

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“…Ni and Cr concentrations in GPJ 38, GPJ 39, and GPJ 40 are much bigger than Taylor and McLennan upper continental crust and average continent crust of 44-105 and 85-185 ppm, respectively (after Ho et al, 2000) to confirm that the heavy metals were not present naturally. Garnier et al, 2008;Arndt et al, 2010;Schlatter and Stensgaard, 2014) to explain the higher content of these elements in RK 68 rather than RK 22. Ni and Cr contents in the sample from location 2 and location 3 are much higher than RK 68 and RK 22, whilst Sr composition is lower (Table 1).…”

Section: Pollution Identificationmentioning

confidence: 99%

Nickel and Chrome Pollutions Identification in the Coastal Area of Kulon Progo, Yogyakarta

Irzon¹

2017

J. lingkung.

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Kulon Progo is located in the southern part of Yogyakarta Special Province, Indonesia. The regency is famous of some tourist beach points. This study discusses the compositiom of beach sand samples in three coastal areas in Kulon Progo: Karangwuni, Glagah, and Congot in relation to environmental issues. Seven samples of four locations were megascopically descripted and analyzed using XRF and ICP-MS for geochemistry contents. Four of samples are beach sands from the surface whilst the others were collected from about 50 cm below surface. Box plots show maximum Cr outlier and minimum most of REE outliers in the group of beach sand samples. Nickel and chrome tenor anomalies were detected in samples from coastline of Karangwuni and Glagah. On the other hand, no Ni and Cr anamalies were indentified in the two samples 200 m from the seashore of Karangwuni nor the two samples near Congot seashore. In the polluted location, the two heavy metals are relatively concentrated in the surface. Two volcanic rock samples from the Andesite domain are selected to trace the origin of the heavy metals. The wastes of basic metal mining in northern Kulon Progo together with urban activities and several industries in Wates were then transported through the Serang River to Indian Ocean. Tidal currents helps the heavy metals to be deposited in the coastal areas near the mouth of Serang River. This study also concluded that folk gold mining activity in Sangon is not the source of Ni and Cr pollution to the coast of Kulon Progo.Keyword: geochemistry, beach sand, Kulon Progo, heavy metals pollution. Sari Kulon Progo berlokasi di bagian selatan Provinsi Daerah Istimewa Jakarta, Indonesia. Kabupaten ini terkenal dengan beberapa lokasi wisata pantai. Studi ini membahas mengenai komposisi pasir pantai pada tiga lokasi pantai di Kulon Progo: Karangwuni, Glagah, dan Congot terkait dengan masalah lingkungan. Tujuh contoh dari empat lokasi penelitian telah dideskripsikan secara megaskopis dan dianalisis kandungan geokimianya menggunakan XRF dan ICP-MS. Empat contoh merupakan pasir pantai yang berasal dari permukaan sedangkan contoh lain berasal dari 50 cm di bawah permukaan. Box plot dengan jelas menunjukkan keberadaan maximum outlier pada Cr dan minimum ourlier pada banyak elemen dari REE pada kelompok contoh pasir pantai. Anomali tinggi nikel dan krom terdeteksi pada seluruh contoh yang berada dekat tepi pantai di Karangwuni dan Glagah. Namun demikian, tidak terdapat anomali Ni dan Cr pada dua contoh yang berasal dari 200 m sebelum tepi pantai Karangwuni maupun dua contoh dari Pantai Congot. Pada titik yang tercemar polusi, dua logam berat ini lebih terkonsentrasi pada bagian permukaan. Dua batuan vulkanik dari wilayah Andesit dipilih dalam menelusuri asal muasal logam berat tersebut. Sampah sisa penambangan logam dasar bersama dengan aktifitas perkotaan dan industri di Kulon Progo telah terbawa oleh aliran Sungai Serang menuju Samudera Hindia. Arus bolak-balik air laut membantu logam berat tersebut terdepositkan di wilayah pantai dekat dengan mulut Sungai Serang. Studi ini turut menyimpulkan bahwa penambangan emas rakyat di Sangon bukan sebagai sumber pencemaran Ni dan Cr di tepi pantai Kulon ProgoKata kunci: geokimia, pasir pantai, Kulon Progo, polusi logam berat

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“…The gold accumulation is thought to have occurred during the intrusion of granites into the Bjørnesund supracrustal belt and during deformation associated with coeval thrusts and strike slip faults (Keulen et al, 2014). Metasomatic aluminous gneisses containing cordierite, garnet and sillimanite were generated during hightemperature hydrothermal alteration of the volcanic rocks (Schumacher et al, 2011;Schlatter and Stensgaard, 2014); these are difficult to distinguish from metamorphosed rocks that had already been altered in a surficial environment.…”

Section: Bjørnesund and Ravns Storø (Ikkattup Nunaa) Supracrustal Beltsmentioning

confidence: 99%

Archaean Plate Tectonics in the North Atlantic Craton of West Greenland Revealed by Well-Exposed Horizontal Crustal Tectonics, Island Arcs and Tonalite-Trondhjemite-Granodiorite Complexes

et al. 2020

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The 700 km-long North Atlantic Craton (NAC) in West Greenland is arguably the best exposed and most continuous section of Eo-to Neoarchaean crust on Earth. This allows a close and essential correlation between geochemical and isotopic data and primary, well-defined and well-studied geological relationships. The NAC is therefore an excellent and unsurpassed stage for the ongoing controversial discussion about uniformitarian versus non-uniformitarian crustal evolution in the Archaean. The latest research on the geochemistry, structural style, and Hf isotope geochemistry of tonalite-trondhjemite-granodiorite (TTG) complexes and their intercalated mafic to intermediate volcanic belts strongly supports previous conclusions that the NAC formed by modern-style plate tectonic processes with slab melting of wet basaltic oceanic crust in island arcs and active continental margins. New studies of the lateral tectonic convergence and collision between juvenile belts in the NAC corroborate this interpretation. Nevertheless, it has repeatedly been hypothesised that the Earth’s crust did not develop by modern-style, subhorizontal plate tectonics before 3.0 Ga, but by vertical processes such as crustal sinking and sagduction, and granitic diapirism with associated dome-and-keel structures. Many of these models are based on supposed inverted crustal density relations, with upper Archaean crust dominated by heavy mafic ridge-lavas and island arcs, and lower Archaean crust mostly consisting of felsic, supposedly buoyant TTGs. Some of them stem from older investigations of upper-crustal Archaean greenstone belts particularly in the Dharwar craton, the Slave and Superior provinces and the Barberton belt. These interpreted interactions between these upper and lower crustal rocks are based on the apparent down-dragged greenstone belts that wrap around diapiric granites. However, in the lower crustal section of the NAC, there is no evidence of any low-density granitic diapirs or heavy, downsagged or sagducted greenstone belts. Instead, the NAC contains well-exposed belts of upper crustal, arc-dominant greenstone belts imbricated and intercalated by well-defined thrusts with the protoliths of the now high-grade TTG gneisses, followed by crustal shortening mainly by folding. This shows us that the upper and lower Archaean crustal components did not interact by vertical diapirism, but by subhorizontal inter-thrusting and folding in an ambient, mainly convergent plate tectonic regime.

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Combining exploration and multivariate techniques to detect the Bjørnesund West gold occurrence, southern West Greenland

Cited by 5 publications

References 0 publications

Metallogeny of the North Atlantic Craton in Greenland

Metallogeny of the North Atlantic Craton in Greenland

Nickel and Chrome Pollutions Identification in the Coastal Area of Kulon Progo, Yogyakarta

Archaean Plate Tectonics in the North Atlantic Craton of West Greenland Revealed by Well-Exposed Horizontal Crustal Tectonics, Island Arcs and Tonalite-Trondhjemite-Granodiorite Complexes

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