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Diamond exploration and prospectivity of Greenland. Gov Greenland Department of Geology Record 1, 228 pp.
No full textGreenland is dominated by cratonic blocks that provide conditions for the formation of diamonds. Pre-1.6 Ga rocks are exposed over 43% of ice-free land and many basins in younger areas evidence underlying Archean basement. Studies of mantle xenoliths reveal thick mantle lithosphere to 220 km in the North Atlantic Craton of western Greenland. Kimberlites, ultramafic lamprophyres and lamproites are known to be exposed abundantly, and span 1632 Ma of geological time. With carbonatites, 3029 discrete bedrock diamond-prospective occurrences have been identified. Known diamondiferous bodies are well represented over Greenland’s west coast, most notably the Garnet Lake 4 metre-thick composite aillikite / kimberlite sheet at Sarfartoq, and aillikite sheets at Qeqertaa, Disko Bay. Data from these, and other localities, demonstrate the potential for Greenland to host diamondiferous bodies with large, good quality diamonds in potentially economic concentrations. While preserved pipes may be discovered at higher elevations, the rarity of known pipes and diatremes evidences extensive glacial erosion and raises the potential for offshore and paleoplacer deposits.
The Government of Greenland’s Diamond exploration data package is used to conduct a regional diamond prospectivity analysis. Most prior exploration targeted diamond indicator minerals in alluvial and glaciogenic samples averaging 10 kg in weight, and with inspection of recovered indicators concluding that sampling strategies have been adequate. Indicator minerals, including garnet, all reveal mineral chemistries consistent with deep mantle sources, often within the diamond stability field, and ilmenite compositions often support very high diamond preservation. All geographic subdivisions overlap chemistries of indicators from diamond-producing areas of Canada. The North Atlantic Craton of West Greenland and the Ketilidian Orogen of southern Greenland show particularly consistent diamond-prospective chemistries, while the Rae Craton of western Greenland is more variable. Quantitative prospectivity modelling incorporating geophysical data emphasises the importance of these regions but also highlights potential in the under-explored Inglefield Orogen and North Atlantic Craton of eastern Greenland.
Historical data, compared with more regional, indirect prospectivity metrics show that further opportunities for diamond exploration exist in Greenland in selected areas of the west coast, as well as within less-explored areas such as eastern and northern regions, and offshore
DK-model2019 - Model data, calibration statistics and simulation results (GIS)
No full textThis folder contains model data, calibration statistics and simulation results from DK-model2019. Grid files and .shp files are assembled in ArcGIS Pro v.3.0.1.
Modeldata contains hydrological and geological data from DK-model2019. DK-model2019 setup and calibration is described in GEUS report 2019/31.
Calibration statistics contain calibration data from DK-model2019. DKmodel2019 setup and calibration are described in the GEUS reports 2019/31.
Simulation results contain various results simulated with DK-model2019. For results regarding streamflow, seepage from groundwater to streams, depth to groundwater table, net precipitation, recharge and water velocity, refer to GEUS report 2019/32. For results regarding delineation of groundwater bodies, contact between groundwater bodies and surface water, abstractions linked to the groundwater bodies, refer to GEUS report 2020/1. For results, regarding changes in simulated groundwater head levels, change in depth to the groundwater table and change in stream runoff, refer again to GEUS report 2019/32. For a detailed description of the procedure, including the distribution of extracted amounts per water plant, connection to groundwater, etc., refer to GEUS report 2021/19 Annex 6
Danish Water Supply Areas and their links to water production facilities: an open-access data set
No full textThis data set establishes the missing link between drinking-water quality monitoring data at the water production facility level in the Danish national geodatabase Jupiter and supply areas. Water Supply Areas (WSAs) were collected at municipality level, digitised and linked to the waterworks they are supplied by. Infrastructural changes between 1978 and 2019 were taken into account by allowing WSA polygons to change over time. The number of active WSAs decreased from 3172 in 1978 to 2602 in 2019. The data set consists of longitudinal WSA polygons and a table linking WSAs to the water production facility identification in the Jupiter database, allowing the estimation of cur-rent and historical drinking-water quality across Denmark. In combination with the Danish Address Register and the Civil Registration System, this data set allows exposure assessments of drink-ing-water quality at high spatiotemporal resolution for the entire Danish population. Therefore, this data set is an essential part of studying health effects of drinking-water quality in epidemiological research in Denmark
Deliverables for ESA PRODEX contract Seamless Integration of Sentinel-3 Albedos in a Weather-modelling System (SISAWS)
No full textDeliverables for ESA PRODEX contract Seamless Integration of Sentinel-3 Albedos in a Weather-modelling System (SISAWS
Geological map of Greenland 1:100 000, Nuugaatsiaq 71 V. 2 Nord
No full textGeologisk kort over Grønland - Geological map of Greenland, 1:100,000, central West Greenlan
selection of daily Sentinel-2 imagery from Southern Greenland 2017 to 2021
No full textimagery features Qajuuttap sermia, Bredefjord and Qalerallit sermiat. Narsarsuaq is visible in the coverage. The imagery are stored as 10 m geotiff files processed by J. Box using code adapted after that from https://github.com/AdrienWehrle/earthspy of Adrien Wehrlé at U. Zurich. The code can be run easily by [email protected] for other times of year
Watson River Discharge
No full textHourly, daily and yearly values of meltwater discharge through the Watson River, west Greenland, according to the method described in the associated scientific publications
Realizations of the subsurface representing interpretation uncertainty of a hydrostratigraphic model from Egebjerg, Denmark
No full textEnsemble of 200 realizations of the subsurface near Egebjerg Denmark. The realizations were made using the GDM method (https://doi.org/10.1016/j.enggeo.2022.106833) to demonstrate the method. The realizations represent the interpretation uncertainty of the layer boundaries from a hydrostratigraphic model containing 14 layers made in the Egebjerg area using manual interpretation. Thus, the realizations can be provide a variable structural input in hydrological modelling.
The structure of the data is as follows:
• There are 200 separate folders each containing 15 layer boundaries (separating the 14 layers).
• Each layer boundary has an XYZ-file within each realization folder with headers X,Y and Z and the corresponding values of the layer boundaries.
• Each layer boundary is defined on a 100m x 100m grid.
• The terrain (layer 1 is constant throughout all realizations).
The layer boundaries are numbered as follows:
1. Terrain
2. Bottom Quaternary Sand 1
3. Bottom Quaternary Clay 1
4. Bottom Quaternary Sand 2
5. Bottom Quaternary Clay 2
6. Bottom Quaternary Sand 3
7. Bottom Quaternary Clay 3
8. Bottom Quaternary Sand 4
9. Bottom Quaternary Clay 4
10. Bottom Quaternary Sand 5
11. Miocene Clay 1
12. Miocene Sand
13. Miocene Clay 2
14. Paleogene Clay
15. Limestone
For more information on how the realizations were made please refer to: https://doi.org/10.1016/j.enggeo.2022.106833. The realizations were calculated on the 19th of May, 2022
Zackenberg CARRA daily total precipitation, rainfall and 2 m air temperature for 31 years (1991 to 2021)
No full text31 years (1991 to 2021) daily CARRA daily total precipitation, rainfall and 2 m air T for points around Greenlan
DK-model2019 - Simulation results (GIS)
No full textThis folder contains contain various results simulated with DK-model2019. Grid files and .shp files are assembled in ArcGIS Pro v.3.0.1. For results regarding streamflow, seepage from groundwater to streams, depth to groundwater table, net precipitation, recharge and water velocity, refer to GEUS report 2019/32. For results regarding delineation of groundwater bodies, contact between groundwater bodies and surface water, abstractions linked to the groundwater bodies, refer to GEUS report 2020/1. For results, regarding changes in simulated groundwater head levels, change in depth to the groundwater table and change in stream runoff, refer again to GEUS report 2019/32. For a detailed description of the procedure, including the distribution of extracted amounts per water plant, connection to groundwater, etc., refer to GEUS report 2021/19 Annex 6