کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6482022 | 1413928 | 2017 | 15 صفحه PDF | دانلود رایگان |
- Fractal dimensions suggest different mineralization controls acted in diverse scales.
- IOCG deposits cluster heterogeneously at scales of <Â 40Â km.
- Clusters of IOCG deposits form E-W linear trends at scales larger than 40Â km.
- IOCG deposits are concentrated along WNW-ESE, E-W and NW-SE trends.
- IOCG deposits are located in areas with intermediate to high fractal dimensions.
Mineral deposits are formed by interaction of various geological processes and conditioned by controls that favor their formation and preservation. The understanding of mineralization controls is critical for mineral exploration because it allows focusing exploration on regions where these controls are concentrated. The analysis of the spatial distribution of mineral deposits, particularly on a regional scale, can provide information relevant to the understanding of regional-scale processes involved during their formation. Here we present a review of Fry and fractal methods for spatial analysis of mineral deposit distribution and an application using the iron oxide-copper-gold (IOCG) deposits of the Carajás Mineral Province (Brazil). Results show that different IOCG mineralization structural controls acted in scales of <Â 10-15Â km, 15 to 40Â km, and >Â 40Â km. The IOCG deposits cluster at scales of <Â 40Â km, whereas different clusters of IOCG deposits form WNW-ESE alignments at scales larger than 40Â km. Structures oriented to WNW-ESE, E-W and NW-SE, with secondary trends to ENE-WSW and NNE-SSW, host the main IOCG deposits in Carajás. Additionally, Carajás IOCG deposits are located in areas with intermediate to high fractal dimensions, reflecting tracts with intermediate to high complexity of structural patterns. Information yielded in this work provides relevant criteria for further exploration for IOCG deposits in the region, including an indication of a possible new WNW-ESE central trend, apart from the northern and southern copper belts in the Carajás Mineral Province.
Journal: Ore Geology Reviews - Volume 81, Part 1, March 2017, Pages 230-244