A self-organizing map (SOM) approach has been used to provide an integrated spatial analysis and classification of airborne geophysical data collected over the Brazilian Amazon. Magnetic gamma ray spectrometric were extract signatures related distribution rock types produce a geologic prospective Anapu-Tuerê region. Particular emphasis was given discriminating identifying types, processes gold mineralization, which are known occur in SOM able identify distinctive various units identified on...

Abstract Vegetation impedes the geological analysis of band ratio images, because it is both widely distributed in surficial environment and can be spectrally similar to ferric oxides clays when sampled by broad-band imaging devices. We address this problem a technique we call 'directed principal component analysis' (DPCA) that involves calculating components on two input images. One discriminant, conTused presence vegetation; second chosen for its suitability as vegetation index. Once...

Abstract A technique is described for identifying and mapping hematite goethite on Thematic Mapper (TM) data over arid semi-arid terrains. The method involves directing a principal components analysis at two selected input ratios, each chosen because of its effectiveness highlighting and/or separating hematite, vegetation, in n-dimensional ratio-versus-ratio space. Once the relative positions vegetation are established—a scene-independent criterion—the directions resulting eigenvectors...

The opening and spreading of the Atlantic Ocean between Africa South America evolved during Early Cretaceous were preceded by dramatic tholeiitic (mafic) magmatism minor silicic alkaline volcanism. These features are presently recognized from equatorial regions Brazil to Falklands Africa. In southeastern America, continental flood basalts related plumbing systems constitute Paraná Magmatic Province (PMP), whose African counterpart is Etendeka (EMP). northeastern Brazil, dike swarms sill...

The effectiveness of some novel software tools used for clustering and classifying multivariate data is tested to evaluate mineral exploration criteria by examining a deposit major fault database. database containing 364 diverse deposits divided into natural groups utilising vector quantisation data-mining approach based on self-organising map (SOM), phenetic cladistic analysis packages. last two approaches are loosely biological principles numerical taxonomy evolutionary relationships,...

SummaryTo improve mineral exploration success, there is an accepted need to increase the "discovery space" by exploring under cover and greater depths using 3D geological modelling supported multiple geophysical inversions. To facilitate this approach, multi-sensor airborne platforms capable of simultaneously measuring electromagnetic, gravity, magnetic data are now being deployed. The availability from such systems poses a significant challenge geophysicist: How do you generate shared earth...

SummarySusceptibility and density volumes, derived from the inversion of airborne magnetic ground-based gravity measurements for a region Mt Isa inlier, Queensland, Australia, were analysed using selforganizing map (SOM) approach. Three-dimensional sub-surface voxel distributions susceptibility data University British Columbia (UBC) codes. These petrophysical volumes are often difficult to interpret because their nebulous nature, with subtle differences between adjacent volume elements. As...

Multi‐sensor airborne platforms capable of measuring electromagnetic, gravity, and magnetic data are now being deployed for mineral exploration. The availability such systems poses a significant challenge the exploration geophysicist: How do you generate common earth model which satisfies all data? We address this with case study from Reid‐Mahaffy test site in Ontario to demonstrate how our multiple 3D inversions MEGATEM II time‐domain FALCON gravity gradiometry, TMI can be analyzed by...

Multiple Sclerosis (MS) is the most prevalent demyelinating disease of Central Nervous System, being Relapsing-Remitting (RRMS) its common subtype. We explored here viability use Self Organizing Maps (SOM) to perform automatic segmentation MS lesions apart from CNS normal tissue. SOM were able, in cases, successfully segment MRIs patients with RRMS, correct separation versus pathological tissue especially supratentorial acquisitions, although it could not differentiate older newer lesions.

Reopening an Abandoned Underground Mine - 3D Digital Inventory Model from Historical Data and Rapid Laser Scanning Tomi Makkonen, Rauno Heikkilä, Jouko Jylänki, Stephen Fraser Pages 1-8 (2015 Proceedings of the 32nd ISARC, Oulu, Finland, ISBN 978-951-758-597-2, ISSN 2413-5844) Abstract: The decision to reopen a mine abandoned for 30 years is going be complex because significant financial commitment depend on re-evaluation both remaining mineral resource surviving infrastructure. pre-digital...

Author Summary: Historically, the application of nuclear science to borehole logging began with detection natural radioactivity emitted by rocks and soils. This simple effective method found many applications, particularly in sedimentary, coal uranium deposits. Whilst this technique is still widely used today, industry quickly moved more sophisticated techniques that activate neutrons measure induced radiation infer characteristics material surrounding hole. Neutrons, as primary particles,...

Abstract Rocks formerly mapped as Lower Proterozoic Argylla Formation near Mary Kathleen in northwest Queensland consist of parallel lenses very deformed schist, quartzite and various types metaporphyry. Completely intermingled with these are bands amphibolite the adjacent Wonga Granite. Finite ductile strains 65–80% maximum shortening have been measured; produced transposition on both a mesoscopic macroscopic scale. It is shown that major stratigraphic boundaries much shallower than steeply...