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(E-mail: evamarff@gmail.com)Tj
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(ABSTRACT)Tj
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(preliminary investigation has been carried out by the Geological Survey of Spain, to evaluate mineral potentiality in the NW domain of)Tj
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[(the Iberian Pyrite Belt. Research focused on volcanogenic massive sulphide deposits of the so-called \322V)70(ocano Sedimentary Complex\323)]TJ
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(from Lower Carboniferous. Four evidential maps \(lithologic, gravity)Tj
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(magnetic and structural\) were incorporated into a geographical)Tj
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(information system and integrated in a mineral potential map, using weights of evidence and logistic regression methods. The goal is the)Tj
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(application of a new methodology in this area that may facilitate mineral resources decision-making processes. Promising results were)Tj
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[(Key words:)-306(Favorability map, geographical information systems, logistic regression, massive sulphides, weights of evidence)]TJ
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(Integraci\227n de datos geol\227gicos mediante pesos de evidencia y regresi\227n log\222stica)Tj
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(en la Faja Pir\222tica Ib\216rica, Espa\226a)Tj
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(RESUMEN)Tj
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(Instituto Geol\227gico y Minero de Espa\226a ha llevado a cabo una investigaci\227n preliminar para evaluar el potencial minero del Dominio)Tj
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[(NO de la Faja Pir\222tica Ib\216rica. El \216nfasis de la investigaci\227n recay\227 en el estudio del llamado \322Complejo V)55(ulcano Sedimentario\323 de edad)]TJ
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[(Carbon\222fero inferior)74(. Cuatro mapas de evidencia se incorporaron a un sistema de informaci\227n geogr\207fica \(litol\227gico, gravim\216trico,)]TJ
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(magn\216tico y estructural\), lo que permiti\227 su integraci\227n en un mapa de potencial de mineralizaci\227n, mediante la aplicaci\227n de m\216todos)Tj
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(de pesos de evidencia y regresi\227n log\222stica. El objetivo final es ayudar a la toma de decisiones en futuros trabajos de exploraci\227n minera.)Tj
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(Los resultados obtenidos son prometedores en cuanto a uso de estos m\216todos matem\207ticos con fines de geolog\222a aplicada. )Tj
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(Palabras clave)Tj
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[(:)-305(mapa de favorabilidad, pesos de evidencia, regresi\227n log\222stica, sistemas de informaci\227n geogr\207fica,)-1( sulfuros masivos)]TJ
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(Introduction)Tj
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(The Iberian Pyrite Belt (IPB) is one of the most)Tj
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(important metallogenic provinces in the world with)Tj
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(more than 1700 Mt of sulphide ore deposits. There)Tj
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(are several reasons supporting the application of)Tj
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(potential mapping techniques to the IPB. Mining has)Tj
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(been indeed active in the belt since the Chalcolithic)Tj
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(era; consequently new approaches and tools are)Tj
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(currently required to help identify mineral deposits.)Tj
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(On the other hand, there is a complete array of data)Tj
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(available concerning the area. Implementation of)Tj
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(such methods is also relevant since they may also)Tj
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(enable new research lines in relation with mineral)Tj
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(resources of the belt.)Tj
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(Since the 80\253s, mineral potential mapping has)Tj
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(been developed as a research tool for well explored)Tj
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(areas with many data or new exploration zones at a)Tj
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(very low cost. Advances in spatial modelling)Tj
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(techniques have been possible due to the availability)Tj
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((GIS).)Tj
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(The study area is located in the NW domain of the)Tj
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(approximately 30x20 km)Tj
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(Agterberg 1992; Wilkinson )Tj
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(elucidated reviewing the literature mentioned above.)Tj
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(Application to the dataset: Practical case in the IPB)Tj
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(This value represents the probability of occurrence of)Tj
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T*
0.022 Tc
0.5 Tw
(maps \(the higher the value, the stronger the)Tj
T*
0 Tc
0.239 Tw
(correlation\) and are used to weight each evidence)Tj
0 -1.17751 TD
0.272 Tw
[(map \(T)104(able 1\). From the table it can be observed)]TJ
0 -1.17749 TD
0.013 Tc
0.404 Tw
(that the shear bands binary map is the theme)Tj
0 -1.17751 TD
0 Tc
0.216 Tw
(that better correlates with mineral deposits and as)Tj
0 -1.1775 TD
0.022 Tc
0.775 Tw
(expected, both parameters coincided in the)Tj
T*
0 Tc
0.028 Tw
(qualitative order of themes. )Tj
ET
Q
/GS3 gs
/GS2 gs
q
BT
/F0 1 Tf
8 0 0 8 45.3543 729.8381 Tm
0 Tr
0 0 0 1 k
0 Tc
0.019 Tw
(Fern\207ndez, E)Tj
ET
Q
/GS3 gs
/GS2 gs
q
BT
/F1 1 Tf
8 0 0 8 93.9519 729.8381 Tm
0 Tr
0 0 0 1 k
0 Tc
(.)Tj
ET
Q
/GS3 gs
/GS2 gs
q
BT
/F0 1 Tf
8 0 0 8 98.5513 729.8381 Tm
0 Tr
0 0 0 1 k
0 Tc
0.019 Tw
(2006. Integration of geological data by weights of..)Tj
ET
Q
/GS3 gs
/GS2 gs
q
BT
/F1 1 Tf
8 0 0 8 290.7204 729.8381 Tm
0 Tr
0 0 0 1 k
-0.0001 Tc
(.)Tj
0.57498 0 Td
0 Tc
0.019 Tw
(Bolet\222n Geol\227gico y Minero, )Tj
ET
Q
/GS3 gs
/GS2 gs
q
BT
/F0 1 Tf
8 0 0 8 403.9288 729.8381 Tm
0 Tr
0 0 0 1 k
0 Tc
0.019 Tw
(117 (N\234m. Monogr\207fico Especial): 563-566)Tj
ET
Q
/GS3 gs
/GS2 gs
q
BT
/F0 1 Tf
10 0 0 10 296.3858 32.4663 Tm
0 Tr
0 0 0 1 k
0 Tc
0 Tw
(564)Tj
ET
/GS3 gs
0 0 0 0 k
312.061 99.321 251.785 73.6399 re
f
Q
/GS3 gs
/GS2 gs
q
BT
/F3 1 Tf
8 0 0 8 392.6591 159.0452 Tm
0 Tr
0 0 0 1 k
0 Tc
0.028 Tw
[(W)18(eights of Evidence)-1098(Logistic Regression)]TJ
ET
Q
/GS3 gs
/GS2 gs
q
BT
/F1 1 Tf
8 0 0 8 318.311 151.0452 Tm
0 Tr
0 0 0 1 k
0 Tc
0.028 Tw
[(Evidence theme)-4591(Contrast)-6103(Coefficient)]TJ
ET
Q
/GS3 gs
/GS2 gs
q
BT
/F0 1 Tf
8 0 0 8 318.311 138.7346 Tm
0 Tr
0 0 0 1 k
0 Tc
0.028 Tw
[(Shear bands)-6672(1,5644)-7573(1,2855)]TJ
0 -1.3125 TD
0 Tw
[(Magnetic)-8257(1,5561)-7572(0,8807)]TJ
T*
[(Gravity)-9200(1,2383)-7572(0,8763)]TJ
T*
[(Lithology)-8201(1,1122)-7573(0,5990)]TJ
ET
0 J 0 j 10 M []0 d 0.5 w
0 0 0 1 K
312.061 99.321 251.785 73.6399 re
s
BT
/F0 1 Tf
8 0 0 8 311.811 84.79 Tm
(T)Tj
0.50708 0.00001 TD
-0.038 Tw
(able 1. Binary evidential maps contrast and regression coefficients)Tj
ET
Q
/GS3 gs
/GS2 gs
q
BT
/F1 1 Tf
8 0 0 8 311.811 75.1901 Tm
0 Tr
0 0 0 1 k
0 Tc
0.126 Tw
[(T)104(abla 1. Coeficientes binarios de contraste y regresi\227n para cada)]TJ
0 -1.2 TD
0.028 Tw
(tipo de mapa de evidencia)Tj
ET
Q
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