Mineral systems approach applied to GIS-based 2D-prospectivity modelling of geological regions: Insights from Western Australia

Joly, Aurore; Porwal, Alok; McCuaig, T. Campbell; Chudasama, Bijal; Dentith, Mike; Aitken, Alan

doi:10.1016/j.oregeorev.2015.06.007

Cited by 65 publications

(11 citation statements)

References 89 publications

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“…The mineral systems approach [48][49][50][51][52][53][54] can be employed to better understand hydrothermal alteration subsystem that is related to orogenic gold mineralization in the study area. Under dehydration and devolatilization metamorphic conditions, the presence of iron-rich mineral assemblage (pyrite, chalcopyrite, covellite, chalcocite, molybdenite, galena) and metapelitic minerals (chlorite, sericite, quartz, epidote, albite and calcite) present in phyllites and greenschists in the study area promoted the formation of metamorphic fluids and gold ligand (HS − ) [15,30,38,44,45,47,[55][56][57][58].…”

Section: Formation Mechanisms Of Hydrothermal Alteration Subsystemmentioning

confidence: 99%

Structural and hydrothermal alteration mapping related to orogenic gold mineralization in part of Kushaka schist belt, North-central Nigeria, using airborne magnetic and gamma-ray spectrometry data

Sanusi

Amigun

2020

SN Appl. Sci.

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This paper presents an interpretation of airborne magnetic and gamma-ray spectrometry data over a part of the Kushaka schist belt of Nigeria with a view to assess the sub-surface structural framework and hydrothermal alteration haloes that are related to orogenic gold mineralization in the study area. The geophysical analyses performed to improve the quality of the aeromagnetic data for better understanding of the subsurface geology were reduction to the equator, upward continuation, total horizontal derivative, analytical signal, source edge detection, tilt-angle derivative of total horizontal derivative. The analyses performed on the airborne gamma-ray spectrometry data were made on K/eTh, F parameter and deviation of ideal K values (Kd). Deep-seated, brittle-ductile shear/fracture zones with characteristic depth of 428.0-607.6 m and area extent of 15.5 km by 6.5 km that were delineated in the area coincide with beehive of artisanal miners exploiting gold deposits. In this study, subsurface geologic structures, specifically dykes/faults, that trend in the ENE-WSW direction constitute a first-order control on orogenic gold mineralization in the study area. The hydrothermally altered zones mapped in the area indicated they are structurally controlled and closely associated with orogenic gold mineralization. Apart from geologic structural evidences that are controlling orogenic gold mineralization, this study has indicated that hydrothermal alteration mapping is equally important for a promising orogenic gold mineralization mapping.

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Section: Formation Mechanisms Of Hydrothermal Alteration Subsystemmentioning

confidence: 99%

Structural and hydrothermal alteration mapping related to orogenic gold mineralization in part of Kushaka schist belt, North-central Nigeria, using airborne magnetic and gamma-ray spectrometry data

Sanusi

Amigun

2020

SN Appl. Sci.

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“…Generating a mineral potential map derived from remote-sensing data through a GISbased approach has therefore became a fast and accurate tool for identification of target areas for mineral exploration [7,8], particularly during the reconnaissance stage. Since the advent of GIS-based spatial analysis approaches, advances have been achieved in revealing prospective areas of hydrothermal mineral resources [24][25][26]. This is because integration of spatially distributed remote-sensing data using a GIS technique is a significant approach to mineral exploration, as it allows combining multiple datasets through digital overlay methods in order to optimize mineral prospection maps [27].…”

Section: Introductionmentioning

confidence: 99%

Synergy of Remote Sensing Data for Exploring Hydrothermal Mineral Resources Using GIS-Based Fuzzy Logic Approach

Abdelkareem

Al‐Arifi

2021

Remote Sensing

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The Arabian Nubian Shield (ANS) contains a variety of gold deposits in the form of veins and veinlets formed by hydrothermal fluids. Characterizing potential areas of hydrothermal alteration zones therefore provides a significant tool for prospecting for hydrothermal gold deposits. In this study, we develop a model of exploration for hydrothermal mineral resources in an area located in the ANS, Egypt, using multiple criteria derived from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), Landsat-Operational Land Imager (OLI), and Sentinel-2 data and field work through GIS-based fuzzy logic approach. The hydrothermal alteration zones (HAZs) map extracted from combining mineral indices, spectral bands, and ratios is consistent with observed argillic alteration zones around the mineralized veins. Combining HAZs and lineament density led to identification of six zones based on their mineralization potential, and provides a tool for successful reconnaissance prospecting for future hydrothermal mineral deposits. The detected zones are labeled as excellent, very high, high, moderate, low, and very low, based on their potential for Au production, and the predictive excellent and very high zones cover about 1.6% of the study area. This model also shows that target prospective zones are quartz veins controlled by NNW-SSE trending fracture/fault zones all crosscutting Precambrian rocks of the ANS. Field observations and petrographic and X-ray diffraction analyses were performed to validate the mineral prospective map and revealed that quartz veins consist of gold–sulfide mineralization (e.g., gold, pyrite, chalcopyrite, and sphalerite). Consistency between the high potential hydrothermal alterations zones (HAZs) and the location of gold mineralization is achieved.

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“…Geographic Information System (GIS) tools have been used to produce integrative maps through digital overlay methods [8,38,39]. Knowledge-driven approaches integrating multicriteria decision-making depending on expert judgement have also been used to produce predictive maps [40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Application of remote sensing and GIS techniques for exploring potential areas of hydrothermal mineralization in the central Eastern Desert of Egypt

Shi

Al‐Arifi

Abdelkareem

et al. 2020

Journal of Taibah University for Science

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The integration of remotely sensed data allowed the successful characterization of the hydrothermal alteration zones of the Abu-Gaharish area in the Central Eastern Desert of Egypt using image transformation techniques. The integration of several evidential maps highlighted the plausible areas with high concentrations of argillic and phyllic, key hydrothermal minerals that reflect the intensity of hydrothermal effects and the probable sites of ore bodies. The excellent prospective zone identified in the map occupies around 1.39% of the study area. Kaolinite-smectite minerals with correlation scores of around 0.97 were consistent with areas of hydrothermal alteration and mining activities; however, propylitic minerals were confined to basic metavolcanics and serpentinites. The resulting predictive map was assessed using existing mining data with significant consistency; therefore, field verification is essential. The overall results showed that remotely sensed data represent a valuable mapping tool for geological and mineral resources reconnaissance in the arid regions ARTICLE HISTORY

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Mineral systems approach applied to GIS-based 2D-prospectivity modelling of geological regions: Insights from Western Australia

Cited by 65 publications

References 89 publications

Structural and hydrothermal alteration mapping related to orogenic gold mineralization in part of Kushaka schist belt, North-central Nigeria, using airborne magnetic and gamma-ray spectrometry data

Structural and hydrothermal alteration mapping related to orogenic gold mineralization in part of Kushaka schist belt, North-central Nigeria, using airborne magnetic and gamma-ray spectrometry data

Synergy of Remote Sensing Data for Exploring Hydrothermal Mineral Resources Using GIS-Based Fuzzy Logic Approach

Application of remote sensing and GIS techniques for exploring potential areas of hydrothermal mineralization in the central Eastern Desert of Egypt

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